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llvm / llvm-project / llvm / 0410e9c75c4b25d71c9794f8cb51d60642ea8123 / . / test / CodeGen / X86 / x86-shrink-wrapping.ll
blob: d91ba93ffb4212ace1d9da8537325e079045af8d [file] [log] [blame]
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc %s -o - -enable-shrink-wrap=true -pass-remarks-output=%t | FileCheck %s --check-prefix=ENABLE
; RUN: cat %t | FileCheck %s --check-prefix=REMARKS
; RUN: llc %s -o - -enable-shrink-wrap=false | FileCheck %s --check-prefix=DISABLE
;
; Note: Lots of tests use inline asm instead of regular calls.
; This allows to have a better control on what the allocation will do.
; Otherwise, we may have spill right in the entry block, defeating
; shrink-wrapping. Moreover, some of the inline asm statement (nop)
; are here to ensure that the related paths do not end up as critical
; edges.
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "x86_64-apple-macosx"
; Initial motivating example: Simple diamond with a call just on one side.
define i32 @foo(i32 %a, i32 %b) {
; ENABLE-LABEL: foo:
; ENABLE: ## %bb.0:
; ENABLE-NEXT: movl %edi, %eax
; ENABLE-NEXT: cmpl %esi, %edi
; ENABLE-NEXT: jge LBB0_2
; ENABLE-NEXT: ## %bb.1: ## %true
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: movl %eax, {{[0-9]+}}(%rsp)
; ENABLE-NEXT: leaq {{[0-9]+}}(%rsp), %rsi
; ENABLE-NEXT: xorl %edi, %edi
; ENABLE-NEXT: callq _doSomething
; ENABLE-NEXT: addq $8, %rsp
; ENABLE-NEXT: LBB0_2: ## %false
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: foo:
; DISABLE: ## %bb.0:
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: movl %edi, %eax
; DISABLE-NEXT: cmpl %esi, %edi
; DISABLE-NEXT: jge LBB0_2
; DISABLE-NEXT: ## %bb.1: ## %true
; DISABLE-NEXT: movl %eax, {{[0-9]+}}(%rsp)
; DISABLE-NEXT: leaq {{[0-9]+}}(%rsp), %rsi
; DISABLE-NEXT: xorl %edi, %edi
; DISABLE-NEXT: callq _doSomething
; DISABLE-NEXT: LBB0_2: ## %false
; DISABLE-NEXT: popq %rcx
; DISABLE-NEXT: retq
%tmp = alloca i32, align 4
%tmp2 = icmp slt i32 %a, %b
br i1 %tmp2, label %true, label %false
true:
store i32 %a, i32* %tmp, align 4
%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
br label %false
false:
%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
ret i32 %tmp.0
}
; Function Attrs: optsize
declare i32 @doSomething(i32, i32*)
; Check that we do not perform the restore inside the loop whereas the save
; is outside.
define i32 @freqSaveAndRestoreOutsideLoop(i32 %cond, i32 %N) {
; ENABLE-LABEL: freqSaveAndRestoreOutsideLoop:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: testl %edi, %edi
; ENABLE-NEXT: je LBB1_4
; ENABLE-NEXT: ## %bb.1: ## %for.preheader
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbx, -16
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: movl $10, %ecx
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB1_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: addl %edx, %eax
; ENABLE-NEXT: decl %ecx
; ENABLE-NEXT: jne LBB1_2
; ENABLE-NEXT: ## %bb.3: ## %for.end
; ENABLE-NEXT: shll $3, %eax
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB1_4: ## %if.else
; ENABLE-NEXT: movl %esi, %eax
; ENABLE-NEXT: addl %esi, %eax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: freqSaveAndRestoreOutsideLoop:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbx, -16
; DISABLE-NEXT: testl %edi, %edi
; DISABLE-NEXT: je LBB1_4
; DISABLE-NEXT: ## %bb.1: ## %for.preheader
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: movl $10, %ecx
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB1_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: addl %edx, %eax
; DISABLE-NEXT: decl %ecx
; DISABLE-NEXT: jne LBB1_2
; DISABLE-NEXT: ## %bb.3: ## %for.end
; DISABLE-NEXT: shll $3, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB1_4: ## %if.else
; DISABLE-NEXT: movl %esi, %eax
; DISABLE-NEXT: addl %esi, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
entry:
%tobool = icmp eq i32 %cond, 0
br i1 %tobool, label %if.else, label %for.preheader
for.preheader:
tail call void asm "nop", ""()
br label %for.body
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
%call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
%add = add nsw i32 %call, %sum.04
%inc = add nuw nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, 10
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
%shl = shl i32 %add, 3
br label %if.end
if.else: ; preds = %entry
%mul = shl nsw i32 %N, 1
br label %if.end
if.end: ; preds = %if.else, %for.end
%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
ret i32 %sum.1
}
declare i32 @something(...)
; Check that we do not perform the shrink-wrapping inside the loop even
; though that would be legal. The cost model must prevent that.
define i32 @freqSaveAndRestoreOutsideLoop2(i32 %cond) {
; ENABLE-LABEL: freqSaveAndRestoreOutsideLoop2:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbx, -16
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: movl $10, %ecx
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB2_1: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: addl %edx, %eax
; ENABLE-NEXT: decl %ecx
; ENABLE-NEXT: jne LBB2_1
; ENABLE-NEXT: ## %bb.2: ## %for.exit
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: freqSaveAndRestoreOutsideLoop2:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbx, -16
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: movl $10, %ecx
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB2_1: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: addl %edx, %eax
; DISABLE-NEXT: decl %ecx
; DISABLE-NEXT: jne LBB2_1
; DISABLE-NEXT: ## %bb.2: ## %for.exit
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
entry:
br label %for.preheader
for.preheader:
tail call void asm "nop", ""()
br label %for.body
for.body: ; preds = %for.body, %entry
%i.04 = phi i32 [ 0, %for.preheader ], [ %inc, %for.body ]
%sum.03 = phi i32 [ 0, %for.preheader ], [ %add, %for.body ]
%call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
%add = add nsw i32 %call, %sum.03
%inc = add nuw nsw i32 %i.04, 1
%exitcond = icmp eq i32 %inc, 10
br i1 %exitcond, label %for.exit, label %for.body
for.exit:
tail call void asm "nop", ""()
br label %for.end
for.end: ; preds = %for.body
ret i32 %add
}
; Check with a more complex case that we do not have save within the loop and
; restore outside.
define i32 @loopInfoSaveOutsideLoop(i32 %cond, i32 %N) {
; ENABLE-LABEL: loopInfoSaveOutsideLoop:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: testl %edi, %edi
; ENABLE-NEXT: je LBB3_4
; ENABLE-NEXT: ## %bb.1: ## %for.preheader
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbx, -16
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: movl $10, %ecx
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB3_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: addl %edx, %eax
; ENABLE-NEXT: decl %ecx
; ENABLE-NEXT: jne LBB3_2
; ENABLE-NEXT: ## %bb.3: ## %for.end
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: shll $3, %eax
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB3_4: ## %if.else
; ENABLE-NEXT: movl %esi, %eax
; ENABLE-NEXT: addl %esi, %eax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: loopInfoSaveOutsideLoop:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbx, -16
; DISABLE-NEXT: testl %edi, %edi
; DISABLE-NEXT: je LBB3_4
; DISABLE-NEXT: ## %bb.1: ## %for.preheader
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: movl $10, %ecx
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB3_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: addl %edx, %eax
; DISABLE-NEXT: decl %ecx
; DISABLE-NEXT: jne LBB3_2
; DISABLE-NEXT: ## %bb.3: ## %for.end
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: shll $3, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB3_4: ## %if.else
; DISABLE-NEXT: movl %esi, %eax
; DISABLE-NEXT: addl %esi, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
entry:
%tobool = icmp eq i32 %cond, 0
br i1 %tobool, label %if.else, label %for.preheader
for.preheader:
tail call void asm "nop", ""()
br label %for.body
for.body: ; preds = %entry, %for.body
%i.05 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
%sum.04 = phi i32 [ %add, %for.body ], [ 0, %for.preheader ]
%call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
%add = add nsw i32 %call, %sum.04
%inc = add nuw nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, 10
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
tail call void asm "nop", "~{ebx}"()
%shl = shl i32 %add, 3
br label %if.end
if.else: ; preds = %entry
%mul = shl nsw i32 %N, 1
br label %if.end
if.end: ; preds = %if.else, %for.end
%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
ret i32 %sum.1
}
; Check with a more complex case that we do not have restore within the loop and
; save outside.
define i32 @loopInfoRestoreOutsideLoop(i32 %cond, i32 %N) nounwind {
; ENABLE-LABEL: loopInfoRestoreOutsideLoop:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: testl %edi, %edi
; ENABLE-NEXT: je LBB4_4
; ENABLE-NEXT: ## %bb.1: ## %if.then
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: movl $10, %ecx
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB4_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: addl %edx, %eax
; ENABLE-NEXT: decl %ecx
; ENABLE-NEXT: jne LBB4_2
; ENABLE-NEXT: ## %bb.3: ## %for.end
; ENABLE-NEXT: shll $3, %eax
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB4_4: ## %if.else
; ENABLE-NEXT: movl %esi, %eax
; ENABLE-NEXT: addl %esi, %eax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: loopInfoRestoreOutsideLoop:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: testl %edi, %edi
; DISABLE-NEXT: je LBB4_4
; DISABLE-NEXT: ## %bb.1: ## %if.then
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: movl $10, %ecx
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB4_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: addl %edx, %eax
; DISABLE-NEXT: decl %ecx
; DISABLE-NEXT: jne LBB4_2
; DISABLE-NEXT: ## %bb.3: ## %for.end
; DISABLE-NEXT: shll $3, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB4_4: ## %if.else
; DISABLE-NEXT: movl %esi, %eax
; DISABLE-NEXT: addl %esi, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
entry:
%tobool = icmp eq i32 %cond, 0
br i1 %tobool, label %if.else, label %if.then
if.then: ; preds = %entry
tail call void asm "nop", "~{ebx}"()
br label %for.body
for.body: ; preds = %for.body, %if.then
%i.05 = phi i32 [ 0, %if.then ], [ %inc, %for.body ]
%sum.04 = phi i32 [ 0, %if.then ], [ %add, %for.body ]
%call = tail call i32 asm sideeffect "movl $$1, $0", "=r,~{ebx}"()
%add = add nsw i32 %call, %sum.04
%inc = add nuw nsw i32 %i.05, 1
%exitcond = icmp eq i32 %inc, 10
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
%shl = shl i32 %add, 3
br label %if.end
if.else: ; preds = %entry
%mul = shl nsw i32 %N, 1
br label %if.end
if.end: ; preds = %if.else, %for.end
%sum.1 = phi i32 [ %shl, %for.end ], [ %mul, %if.else ]
ret i32 %sum.1
}
; Check that we handle function with no frame information correctly.
define i32 @emptyFrame() {
; ENABLE-LABEL: emptyFrame:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: emptyFrame:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: retq
entry:
ret i32 0
}
; Check that we handle inline asm correctly.
define i32 @inlineAsm(i32 %cond, i32 %N) {
; ENABLE-LABEL: inlineAsm:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: testl %edi, %edi
; ENABLE-NEXT: je LBB6_4
; ENABLE-NEXT: ## %bb.1: ## %for.preheader
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbx, -16
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: movl $10, %eax
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB6_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: addl $1, %ebx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: decl %eax
; ENABLE-NEXT: jne LBB6_2
; ENABLE-NEXT: ## %bb.3: ## %for.exit
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB6_4: ## %if.else
; ENABLE-NEXT: movl %esi, %eax
; ENABLE-NEXT: addl %esi, %eax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: inlineAsm:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbx, -16
; DISABLE-NEXT: testl %edi, %edi
; DISABLE-NEXT: je LBB6_4
; DISABLE-NEXT: ## %bb.1: ## %for.preheader
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: movl $10, %eax
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB6_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: addl $1, %ebx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: decl %eax
; DISABLE-NEXT: jne LBB6_2
; DISABLE-NEXT: ## %bb.3: ## %for.exit
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB6_4: ## %if.else
; DISABLE-NEXT: movl %esi, %eax
; DISABLE-NEXT: addl %esi, %eax
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
entry:
%tobool = icmp eq i32 %cond, 0
br i1 %tobool, label %if.else, label %for.preheader
for.preheader:
tail call void asm "nop", ""()
br label %for.body
for.body: ; preds = %entry, %for.body
%i.03 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
tail call void asm "addl $$1, %ebx", "~{ebx}"()
%inc = add nuw nsw i32 %i.03, 1
%exitcond = icmp eq i32 %inc, 10
br i1 %exitcond, label %for.exit, label %for.body
for.exit:
tail call void asm "nop", ""()
br label %if.end
if.else: ; preds = %entry
%mul = shl nsw i32 %N, 1
br label %if.end
if.end: ; preds = %for.body, %if.else
%sum.0 = phi i32 [ %mul, %if.else ], [ 0, %for.exit ]
ret i32 %sum.0
}
; Check that we handle calls to variadic functions correctly.
define i32 @callVariadicFunc(i32 %cond, i32 %N) {
; ENABLE-LABEL: callVariadicFunc:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: movl %esi, %eax
; ENABLE-NEXT: testl %edi, %edi
; ENABLE-NEXT: je LBB7_2
; ENABLE-NEXT: ## %bb.1: ## %if.then
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: movl %eax, (%rsp)
; ENABLE-NEXT: movl %eax, %edi
; ENABLE-NEXT: movl %eax, %esi
; ENABLE-NEXT: movl %eax, %edx
; ENABLE-NEXT: movl %eax, %ecx
; ENABLE-NEXT: movl %eax, %r8d
; ENABLE-NEXT: movl %eax, %r9d
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: callq _someVariadicFunc
; ENABLE-NEXT: shll $3, %eax
; ENABLE-NEXT: addq $8, %rsp
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB7_2: ## %if.else
; ENABLE-NEXT: addl %eax, %eax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: callVariadicFunc:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: movl %esi, %eax
; DISABLE-NEXT: testl %edi, %edi
; DISABLE-NEXT: je LBB7_2
; DISABLE-NEXT: ## %bb.1: ## %if.then
; DISABLE-NEXT: movl %eax, (%rsp)
; DISABLE-NEXT: movl %eax, %edi
; DISABLE-NEXT: movl %eax, %esi
; DISABLE-NEXT: movl %eax, %edx
; DISABLE-NEXT: movl %eax, %ecx
; DISABLE-NEXT: movl %eax, %r8d
; DISABLE-NEXT: movl %eax, %r9d
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: callq _someVariadicFunc
; DISABLE-NEXT: shll $3, %eax
; DISABLE-NEXT: popq %rcx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB7_2: ## %if.else
; DISABLE-NEXT: addl %eax, %eax
; DISABLE-NEXT: popq %rcx
; DISABLE-NEXT: retq
entry:
%tobool = icmp eq i32 %cond, 0
br i1 %tobool, label %if.else, label %if.then
if.then: ; preds = %entry
%call = tail call i32 (i32, ...) @someVariadicFunc(i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N, i32 %N)
%shl = shl i32 %call, 3
br label %if.end
if.else: ; preds = %entry
%mul = shl nsw i32 %N, 1
br label %if.end
if.end: ; preds = %if.else, %if.then
%sum.0 = phi i32 [ %shl, %if.then ], [ %mul, %if.else ]
ret i32 %sum.0
}
declare i32 @someVariadicFunc(i32, ...)
; Check that we use LEA not to clobber EFLAGS.
%struct.temp_slot = type { %struct.temp_slot*, %struct.rtx_def*, %struct.rtx_def*, i32, i64, %union.tree_node*, %union.tree_node*, i8, i8, i32, i32, i64, i64 }
%union.tree_node = type { %struct.tree_decl }
%struct.tree_decl = type { %struct.tree_common, i8*, i32, i32, %union.tree_node*, i48, %union.anon, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %struct.rtx_def*, %struct.rtx_def*, %union.anon.1, %union.tree_node*, %union.tree_node*, %union.tree_node*, i64, %struct.lang_decl* }
%struct.tree_common = type { %union.tree_node*, %union.tree_node*, i32 }
%union.anon = type { i64 }
%union.anon.1 = type { %struct.function* }
%struct.function = type { %struct.eh_status*, %struct.stmt_status*, %struct.expr_status*, %struct.emit_status*, %struct.varasm_status*, i8*, %union.tree_node*, %struct.function*, i32, i32, i32, i32, %struct.rtx_def*, %struct.ix86_args, %struct.rtx_def*, %struct.rtx_def*, i8*, %struct.initial_value_struct*, i32, %union.tree_node*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %union.tree_node*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, i64, %union.tree_node*, %union.tree_node*, %struct.rtx_def*, %struct.rtx_def*, i32, %struct.rtx_def**, %struct.temp_slot*, i32, i32, i32, %struct.var_refs_queue*, i32, i32, i8*, %union.tree_node*, %struct.rtx_def*, i32, i32, %struct.machine_function*, i32, i32, %struct.language_function*, %struct.rtx_def*, i24 }
%struct.eh_status = type opaque
%struct.stmt_status = type opaque
%struct.expr_status = type { i32, i32, i32, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def*, %struct.rtx_def* }
%struct.emit_status = type { i32, i32, %struct.rtx_def*, %struct.rtx_def*, %union.tree_node*, %struct.sequence_stack*, i32, i32, i8*, i32, i8*, %union.tree_node**, %struct.rtx_def** }
%struct.sequence_stack = type { %struct.rtx_def*, %struct.rtx_def*, %union.tree_node*, %struct.sequence_stack* }
%struct.varasm_status = type opaque
%struct.ix86_args = type { i32, i32, i32, i32, i32, i32, i32 }
%struct.initial_value_struct = type opaque
%struct.var_refs_queue = type { %struct.rtx_def*, i32, i32, %struct.var_refs_queue* }
%struct.machine_function = type opaque
%struct.language_function = type opaque
%struct.lang_decl = type opaque
%struct.rtx_def = type { i32, [1 x %union.rtunion_def] }
%union.rtunion_def = type { i64 }
declare hidden fastcc %struct.temp_slot* @find_temp_slot_from_address(%struct.rtx_def* readonly)
define void @useLEA(%struct.rtx_def* readonly %x) {
; ENABLE-LABEL: useLEA:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: testq %rdi, %rdi
; ENABLE-NEXT: je LBB8_7
; ENABLE-NEXT: ## %bb.1: ## %if.end
; ENABLE-NEXT: cmpw $66, (%rdi)
; ENABLE-NEXT: jne LBB8_7
; ENABLE-NEXT: ## %bb.2: ## %lor.lhs.false
; ENABLE-NEXT: movq 8(%rdi), %rdi
; ENABLE-NEXT: movzwl (%rdi), %eax
; ENABLE-NEXT: leal -54(%rax), %ecx
; ENABLE-NEXT: cmpl $14, %ecx
; ENABLE-NEXT: ja LBB8_3
; ENABLE-NEXT: ## %bb.8: ## %lor.lhs.false
; ENABLE-NEXT: movl $24599, %edx ## imm = 0x6017
; ENABLE-NEXT: btl %ecx, %edx
; ENABLE-NEXT: jae LBB8_3
; ENABLE-NEXT: LBB8_7: ## %cleanup
; ENABLE-NEXT: popq %rax
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB8_3: ## %lor.lhs.false
; ENABLE-NEXT: cmpl $134, %eax
; ENABLE-NEXT: je LBB8_7
; ENABLE-NEXT: ## %bb.4: ## %lor.lhs.false
; ENABLE-NEXT: cmpl $140, %eax
; ENABLE-NEXT: je LBB8_7
; ENABLE-NEXT: ## %bb.5: ## %if.end.55
; ENABLE-NEXT: callq _find_temp_slot_from_address
; ENABLE-NEXT: testq %rax, %rax
; ENABLE-NEXT: je LBB8_7
; ENABLE-NEXT: ## %bb.6: ## %if.then.60
; ENABLE-NEXT: movb $1, 57(%rax)
; ENABLE-NEXT: popq %rax
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: useLEA:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: testq %rdi, %rdi
; DISABLE-NEXT: je LBB8_7
; DISABLE-NEXT: ## %bb.1: ## %if.end
; DISABLE-NEXT: cmpw $66, (%rdi)
; DISABLE-NEXT: jne LBB8_7
; DISABLE-NEXT: ## %bb.2: ## %lor.lhs.false
; DISABLE-NEXT: movq 8(%rdi), %rdi
; DISABLE-NEXT: movzwl (%rdi), %eax
; DISABLE-NEXT: leal -54(%rax), %ecx
; DISABLE-NEXT: cmpl $14, %ecx
; DISABLE-NEXT: ja LBB8_3
; DISABLE-NEXT: ## %bb.8: ## %lor.lhs.false
; DISABLE-NEXT: movl $24599, %edx ## imm = 0x6017
; DISABLE-NEXT: btl %ecx, %edx
; DISABLE-NEXT: jae LBB8_3
; DISABLE-NEXT: LBB8_7: ## %cleanup
; DISABLE-NEXT: popq %rax
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB8_3: ## %lor.lhs.false
; DISABLE-NEXT: cmpl $134, %eax
; DISABLE-NEXT: je LBB8_7
; DISABLE-NEXT: ## %bb.4: ## %lor.lhs.false
; DISABLE-NEXT: cmpl $140, %eax
; DISABLE-NEXT: je LBB8_7
; DISABLE-NEXT: ## %bb.5: ## %if.end.55
; DISABLE-NEXT: callq _find_temp_slot_from_address
; DISABLE-NEXT: testq %rax, %rax
; DISABLE-NEXT: je LBB8_7
; DISABLE-NEXT: ## %bb.6: ## %if.then.60
; DISABLE-NEXT: movb $1, 57(%rax)
; DISABLE-NEXT: popq %rax
; DISABLE-NEXT: retq
entry:
%cmp = icmp eq %struct.rtx_def* %x, null
br i1 %cmp, label %cleanup, label %if.end
if.end: ; preds = %entry
%tmp = getelementptr inbounds %struct.rtx_def, %struct.rtx_def* %x, i64 0, i32 0
%bf.load = load i32, i32* %tmp, align 8
%bf.clear = and i32 %bf.load, 65535
%cmp1 = icmp eq i32 %bf.clear, 66
br i1 %cmp1, label %lor.lhs.false, label %cleanup
lor.lhs.false: ; preds = %if.end
%arrayidx = getelementptr inbounds %struct.rtx_def, %struct.rtx_def* %x, i64 0, i32 1, i64 0
%rtx = bitcast %union.rtunion_def* %arrayidx to %struct.rtx_def**
%tmp1 = load %struct.rtx_def*, %struct.rtx_def** %rtx, align 8
%tmp2 = getelementptr inbounds %struct.rtx_def, %struct.rtx_def* %tmp1, i64 0, i32 0
%bf.load2 = load i32, i32* %tmp2, align 8
%bf.clear3 = and i32 %bf.load2, 65535
switch i32 %bf.clear3, label %if.end.55 [
i32 67, label %cleanup
i32 68, label %cleanup
i32 54, label %cleanup
i32 55, label %cleanup
i32 58, label %cleanup
i32 134, label %cleanup
i32 56, label %cleanup
i32 140, label %cleanup
]
if.end.55: ; preds = %lor.lhs.false
%call = tail call fastcc %struct.temp_slot* @find_temp_slot_from_address(%struct.rtx_def* %tmp1) #2
%cmp59 = icmp eq %struct.temp_slot* %call, null
br i1 %cmp59, label %cleanup, label %if.then.60
if.then.60: ; preds = %if.end.55
%addr_taken = getelementptr inbounds %struct.temp_slot, %struct.temp_slot* %call, i64 0, i32 8
store i8 1, i8* %addr_taken, align 1
br label %cleanup
cleanup: ; preds = %if.then.60, %if.end.55, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %lor.lhs.false, %if.end, %entry
ret void
}
; Make sure we do not insert unreachable code after noreturn function.
; Although this is not incorrect to insert such code, it is useless
; and it hurts the binary size.
define i32 @noreturn(i8 signext %bad_thing) {
; ENABLE-LABEL: noreturn:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: testb %dil, %dil
; ENABLE-NEXT: jne LBB9_2
; ENABLE-NEXT: ## %bb.1: ## %if.end
; ENABLE-NEXT: movl $42, %eax
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB9_2: ## %if.abort
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: callq _abort
;
; DISABLE-LABEL: noreturn:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: testb %dil, %dil
; DISABLE-NEXT: jne LBB9_2
; DISABLE-NEXT: ## %bb.1: ## %if.end
; DISABLE-NEXT: movl $42, %eax
; DISABLE-NEXT: popq %rcx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB9_2: ## %if.abort
; DISABLE-NEXT: callq _abort
entry:
%tobool = icmp eq i8 %bad_thing, 0
br i1 %tobool, label %if.end, label %if.abort
if.abort:
tail call void @abort() #0
unreachable
if.end:
ret i32 42
}
declare void @abort() #0
attributes #0 = { noreturn nounwind }
; Make sure that we handle infinite loops properly When checking that the Save
; and Restore blocks are control flow equivalent, the loop searches for the
; immediate (post) dominator for the (restore) save blocks. When either the Save
; or Restore block is located in an infinite loop the only immediate (post)
; dominator is itself. In this case, we cannot perform shrink wrapping, but we
; should return gracefully and continue compilation.
; The only condition for this test is the compilation finishes correctly.
;
define void @infiniteloop() {
; ENABLE-LABEL: infiniteloop:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rbp
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbp, -16
; ENABLE-NEXT: movq %rsp, %rbp
; ENABLE-NEXT: .cfi_def_cfa_register %rbp
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_offset %rbx, -24
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: testb %al, %al
; ENABLE-NEXT: jne LBB10_3
; ENABLE-NEXT: ## %bb.1: ## %if.then
; ENABLE-NEXT: movq %rsp, %rcx
; ENABLE-NEXT: addq $-16, %rcx
; ENABLE-NEXT: movq %rcx, %rsp
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB10_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: addl %edx, %eax
; ENABLE-NEXT: movl %eax, (%rcx)
; ENABLE-NEXT: jmp LBB10_2
; ENABLE-NEXT: LBB10_3: ## %if.end
; ENABLE-NEXT: leaq -8(%rbp), %rsp
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: popq %rbp
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: infiniteloop:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbp
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbp, -16
; DISABLE-NEXT: movq %rsp, %rbp
; DISABLE-NEXT: .cfi_def_cfa_register %rbp
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_offset %rbx, -24
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: testb %al, %al
; DISABLE-NEXT: jne LBB10_3
; DISABLE-NEXT: ## %bb.1: ## %if.then
; DISABLE-NEXT: movq %rsp, %rcx
; DISABLE-NEXT: addq $-16, %rcx
; DISABLE-NEXT: movq %rcx, %rsp
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB10_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: addl %edx, %eax
; DISABLE-NEXT: movl %eax, (%rcx)
; DISABLE-NEXT: jmp LBB10_2
; DISABLE-NEXT: LBB10_3: ## %if.end
; DISABLE-NEXT: leaq -8(%rbp), %rsp
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: popq %rbp
; DISABLE-NEXT: retq
entry:
br i1 undef, label %if.then, label %if.end
if.then:
%ptr = alloca i32, i32 4
br label %for.body
for.body: ; preds = %for.body, %entry
%sum.03 = phi i32 [ 0, %if.then ], [ %add, %for.body ]
%call = tail call i32 asm "movl $$1, $0", "=r,~{ebx}"()
%add = add nsw i32 %call, %sum.03
store i32 %add, i32* %ptr
br label %for.body
if.end:
ret void
}
; Another infinite loop test this time with a body bigger than just one block.
define void @infiniteloop2() {
; ENABLE-LABEL: infiniteloop2:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rbp
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbp, -16
; ENABLE-NEXT: movq %rsp, %rbp
; ENABLE-NEXT: .cfi_def_cfa_register %rbp
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_offset %rbx, -24
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: testb %al, %al
; ENABLE-NEXT: jne LBB11_5
; ENABLE-NEXT: ## %bb.1: ## %if.then
; ENABLE-NEXT: movq %rsp, %rcx
; ENABLE-NEXT: addq $-16, %rcx
; ENABLE-NEXT: movq %rcx, %rsp
; ENABLE-NEXT: xorl %edx, %edx
; ENABLE-NEXT: jmp LBB11_2
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB11_4: ## %body2
; ENABLE-NEXT: ## in Loop: Header=BB11_2 Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: LBB11_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: movl %edx, %esi
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: movl $1, %edx
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: addl %esi, %edx
; ENABLE-NEXT: movl %edx, (%rcx)
; ENABLE-NEXT: testb %al, %al
; ENABLE-NEXT: jne LBB11_4
; ENABLE-NEXT: ## %bb.3: ## %body1
; ENABLE-NEXT: ## in Loop: Header=BB11_2 Depth=1
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: jmp LBB11_2
; ENABLE-NEXT: LBB11_5: ## %if.end
; ENABLE-NEXT: leaq -8(%rbp), %rsp
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: popq %rbp
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: infiniteloop2:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbp
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbp, -16
; DISABLE-NEXT: movq %rsp, %rbp
; DISABLE-NEXT: .cfi_def_cfa_register %rbp
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_offset %rbx, -24
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: testb %al, %al
; DISABLE-NEXT: jne LBB11_5
; DISABLE-NEXT: ## %bb.1: ## %if.then
; DISABLE-NEXT: movq %rsp, %rcx
; DISABLE-NEXT: addq $-16, %rcx
; DISABLE-NEXT: movq %rcx, %rsp
; DISABLE-NEXT: xorl %edx, %edx
; DISABLE-NEXT: jmp LBB11_2
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB11_4: ## %body2
; DISABLE-NEXT: ## in Loop: Header=BB11_2 Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: LBB11_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: movl %edx, %esi
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: movl $1, %edx
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: addl %esi, %edx
; DISABLE-NEXT: movl %edx, (%rcx)
; DISABLE-NEXT: testb %al, %al
; DISABLE-NEXT: jne LBB11_4
; DISABLE-NEXT: ## %bb.3: ## %body1
; DISABLE-NEXT: ## in Loop: Header=BB11_2 Depth=1
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: jmp LBB11_2
; DISABLE-NEXT: LBB11_5: ## %if.end
; DISABLE-NEXT: leaq -8(%rbp), %rsp
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: popq %rbp
; DISABLE-NEXT: retq
entry:
br i1 undef, label %if.then, label %if.end
if.then:
%ptr = alloca i32, i32 4
br label %for.body
for.body: ; preds = %for.body, %entry
%sum.03 = phi i32 [ 0, %if.then ], [ %add, %body1 ], [ 1, %body2]
%call = tail call i32 asm "movl $$1, $0", "=r,~{ebx}"()
%add = add nsw i32 %call, %sum.03
store i32 %add, i32* %ptr
br i1 undef, label %body1, label %body2
body1:
tail call void asm sideeffect "nop", "~{ebx}"()
br label %for.body
body2:
tail call void asm sideeffect "nop", "~{ebx}"()
br label %for.body
if.end:
ret void
}
; Another infinite loop test this time with two nested infinite loop.
define void @infiniteloop3() {
; ENABLE-LABEL: infiniteloop3:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: testb %al, %al
; ENABLE-NEXT: jne LBB12_2
; ENABLE-NEXT: ## %bb.1: ## %body
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: testb %al, %al
; ENABLE-NEXT: jne LBB12_7
; ENABLE-NEXT: LBB12_2: ## %loop2a.preheader
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: xorl %ecx, %ecx
; ENABLE-NEXT: movq %rax, %rsi
; ENABLE-NEXT: jmp LBB12_4
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB12_3: ## %loop2b
; ENABLE-NEXT: ## in Loop: Header=BB12_4 Depth=1
; ENABLE-NEXT: movq %rdx, (%rsi)
; ENABLE-NEXT: movq %rdx, %rsi
; ENABLE-NEXT: LBB12_4: ## %loop1
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: movq %rcx, %rdx
; ENABLE-NEXT: testq %rax, %rax
; ENABLE-NEXT: movq (%rax), %rcx
; ENABLE-NEXT: jne LBB12_3
; ENABLE-NEXT: ## %bb.5: ## in Loop: Header=BB12_4 Depth=1
; ENABLE-NEXT: movq %rdx, %rax
; ENABLE-NEXT: movq %rdx, %rsi
; ENABLE-NEXT: jmp LBB12_4
; ENABLE-NEXT: LBB12_7: ## %end
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: infiniteloop3:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: testb %al, %al
; DISABLE-NEXT: jne LBB12_2
; DISABLE-NEXT: ## %bb.1: ## %body
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: testb %al, %al
; DISABLE-NEXT: jne LBB12_7
; DISABLE-NEXT: LBB12_2: ## %loop2a.preheader
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: xorl %ecx, %ecx
; DISABLE-NEXT: movq %rax, %rsi
; DISABLE-NEXT: jmp LBB12_4
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB12_3: ## %loop2b
; DISABLE-NEXT: ## in Loop: Header=BB12_4 Depth=1
; DISABLE-NEXT: movq %rdx, (%rsi)
; DISABLE-NEXT: movq %rdx, %rsi
; DISABLE-NEXT: LBB12_4: ## %loop1
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: movq %rcx, %rdx
; DISABLE-NEXT: testq %rax, %rax
; DISABLE-NEXT: movq (%rax), %rcx
; DISABLE-NEXT: jne LBB12_3
; DISABLE-NEXT: ## %bb.5: ## in Loop: Header=BB12_4 Depth=1
; DISABLE-NEXT: movq %rdx, %rax
; DISABLE-NEXT: movq %rdx, %rsi
; DISABLE-NEXT: jmp LBB12_4
; DISABLE-NEXT: LBB12_7: ## %end
; DISABLE-NEXT: retq
entry:
br i1 undef, label %loop2a, label %body
body: ; preds = %entry
br i1 undef, label %loop2a, label %end
loop1: ; preds = %loop2a, %loop2b
%var.phi = phi i32* [ %next.phi, %loop2b ], [ %var, %loop2a ]
%next.phi = phi i32* [ %next.load, %loop2b ], [ %next.var, %loop2a ]
%0 = icmp eq i32* %var, null
%next.load = load i32*, i32** undef
br i1 %0, label %loop2a, label %loop2b
loop2a: ; preds = %loop1, %body, %entry
%var = phi i32* [ null, %body ], [ null, %entry ], [ %next.phi, %loop1 ]
%next.var = phi i32* [ undef, %body ], [ null, %entry ], [ %next.load, %loop1 ]
br label %loop1
loop2b: ; preds = %loop1
%gep1 = bitcast i32* %var.phi to i32*
%next.ptr = bitcast i32* %gep1 to i32**
store i32* %next.phi, i32** %next.ptr
br label %loop1
end:
ret void
}
; Check that we just don't bail out on RegMask.
; In this case, the RegMask does not touch a CSR so we are good to go!
define i32 @regmask(i32 %a, i32 %b, i32* %addr) {
; ENABLE-LABEL: regmask:
; ENABLE: ## %bb.0:
; ENABLE-NEXT: cmpl %esi, %edi
; ENABLE-NEXT: jge LBB13_2
; ENABLE-NEXT: ## %bb.1: ## %true
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbx, -16
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: xorl %edi, %edi
; ENABLE-NEXT: movq %rdx, %rsi
; ENABLE-NEXT: callq _doSomething
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB13_2: ## %false
; ENABLE-NEXT: movl $6, %edi
; ENABLE-NEXT: movq %rdx, %rsi
; ENABLE-NEXT: jmp _doSomething ## TAILCALL
;
; DISABLE-LABEL: regmask:
; DISABLE: ## %bb.0:
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbx, -16
; DISABLE-NEXT: cmpl %esi, %edi
; DISABLE-NEXT: jge LBB13_2
; DISABLE-NEXT: ## %bb.1: ## %true
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: xorl %edi, %edi
; DISABLE-NEXT: movq %rdx, %rsi
; DISABLE-NEXT: callq _doSomething
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB13_2: ## %false
; DISABLE-NEXT: movl $6, %edi
; DISABLE-NEXT: movq %rdx, %rsi
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: jmp _doSomething ## TAILCALL
%tmp2 = icmp slt i32 %a, %b
br i1 %tmp2, label %true, label %false
true:
; Clobber a CSR so that we check something on the regmask
; of the tail call.
tail call void asm sideeffect "nop", "~{ebx}"()
%tmp4 = call i32 @doSomething(i32 0, i32* %addr)
br label %end
false:
%tmp5 = tail call i32 @doSomething(i32 6, i32* %addr)
br label %end
end:
%tmp.0 = phi i32 [ %tmp4, %true ], [ %tmp5, %false ]
ret i32 %tmp.0
}
@b = internal unnamed_addr global i1 false
@c = internal unnamed_addr global i8 0, align 1
@a = common global i32 0, align 4
; Make sure the prologue does not clobber the EFLAGS when
; it is live accross.
; PR25629.
; Note: The registers may change in the following patterns, but
; because they imply register hierarchy (e.g., eax, al) this is
; tricky to write robust patterns.
define i32 @useLEAForPrologue(i32 %d, i32 %a, i8 %c) #3 {
; ENABLE-LABEL: useLEAForPrologue:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: subq $16, %rsp
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: cmpb $0, {{.*}}(%rip)
; ENABLE-NEXT: movl $48, %ecx
; ENABLE-NEXT: cmovnel %eax, %ecx
; ENABLE-NEXT: movb %cl, {{.*}}(%rip)
; ENABLE-NEXT: je LBB14_4
; ENABLE-NEXT: ## %bb.1: ## %for.body.lr.ph
; ENABLE-NEXT: ## InlineAsm Start
; ENABLE-NEXT: nop
; ENABLE-NEXT: ## InlineAsm End
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB14_2: ## %for.body
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: cmpl %esi, %edi
; ENABLE-NEXT: setl %al
; ENABLE-NEXT: xorl %esi, %esi
; ENABLE-NEXT: movb %al, %sil
; ENABLE-NEXT: incb %dl
; ENABLE-NEXT: cmpb $45, %dl
; ENABLE-NEXT: jl LBB14_2
; ENABLE-NEXT: ## %bb.3: ## %for.cond.for.end_crit_edge
; ENABLE-NEXT: movq _a@{{.*}}(%rip), %rax
; ENABLE-NEXT: movl %esi, (%rax)
; ENABLE-NEXT: LBB14_4: ## %for.end
; ENABLE-NEXT: xorl %edi, %edi
; ENABLE-NEXT: callq _varfunc
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: addq $16, %rsp
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: useLEAForPrologue:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: subq $16, %rsp
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: cmpb $0, {{.*}}(%rip)
; DISABLE-NEXT: movl $48, %ecx
; DISABLE-NEXT: cmovnel %eax, %ecx
; DISABLE-NEXT: movb %cl, {{.*}}(%rip)
; DISABLE-NEXT: je LBB14_4
; DISABLE-NEXT: ## %bb.1: ## %for.body.lr.ph
; DISABLE-NEXT: ## InlineAsm Start
; DISABLE-NEXT: nop
; DISABLE-NEXT: ## InlineAsm End
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB14_2: ## %for.body
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: cmpl %esi, %edi
; DISABLE-NEXT: setl %al
; DISABLE-NEXT: xorl %esi, %esi
; DISABLE-NEXT: movb %al, %sil
; DISABLE-NEXT: incb %dl
; DISABLE-NEXT: cmpb $45, %dl
; DISABLE-NEXT: jl LBB14_2
; DISABLE-NEXT: ## %bb.3: ## %for.cond.for.end_crit_edge
; DISABLE-NEXT: movq _a@{{.*}}(%rip), %rax
; DISABLE-NEXT: movl %esi, (%rax)
; DISABLE-NEXT: LBB14_4: ## %for.end
; DISABLE-NEXT: xorl %edi, %edi
; DISABLE-NEXT: callq _varfunc
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: addq $16, %rsp
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: retq
entry:
%tmp = alloca i3
%.b = load i1, i1* @b, align 1
%bool = select i1 %.b, i8 0, i8 48
store i8 %bool, i8* @c, align 1
br i1 %.b, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
tail call void asm sideeffect "nop", "~{ebx}"()
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.body
%inc6 = phi i8 [ %c, %for.body.lr.ph ], [ %inc, %for.body ]
%cond5 = phi i32 [ %a, %for.body.lr.ph ], [ %conv3, %for.body ]
%cmp2 = icmp slt i32 %d, %cond5
%conv3 = zext i1 %cmp2 to i32
%inc = add i8 %inc6, 1
%cmp = icmp slt i8 %inc, 45
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
store i32 %conv3, i32* @a, align 4
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
%call = tail call i32 (i8*) @varfunc(i8* null)
ret i32 0
}
declare i32 @varfunc(i8* nocapture readonly)
@sum1 = external hidden thread_local global i32, align 4
; Function Attrs: nounwind
; Make sure the TLS call used to access @sum1 happens after the prologue
; and before the epilogue.
; TLS calls used to be wrongly model and shrink-wrapping would have inserted
; the prologue and epilogue just around the call to doSomething.
; PR25820.
define i32 @tlsCall(i1 %bool1, i32 %arg, i32* readonly dereferenceable(4) %sum1) #3 {
; ENABLE-LABEL: tlsCall:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: testb $1, %dil
; ENABLE-NEXT: je LBB15_2
; ENABLE-NEXT: ## %bb.1: ## %master
; ENABLE-NEXT: movl (%rdx), %ecx
; ENABLE-NEXT: movq _sum1@{{.*}}(%rip), %rdi
; ENABLE-NEXT: callq *(%rdi)
; ENABLE-NEXT: movl %ecx, (%rax)
; ENABLE-NEXT: jmp LBB15_3
; ENABLE-NEXT: LBB15_2: ## %else
; ENABLE-NEXT: xorl %edi, %edi
; ENABLE-NEXT: xorl %esi, %esi
; ENABLE-NEXT: callq _doSomething
; ENABLE-NEXT: movl %eax, %esi
; ENABLE-NEXT: LBB15_3: ## %exit
; ENABLE-NEXT: movl %esi, %eax
; ENABLE-NEXT: popq %rcx
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: tlsCall:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: testb $1, %dil
; DISABLE-NEXT: je LBB15_2
; DISABLE-NEXT: ## %bb.1: ## %master
; DISABLE-NEXT: movl (%rdx), %ecx
; DISABLE-NEXT: movq _sum1@{{.*}}(%rip), %rdi
; DISABLE-NEXT: callq *(%rdi)
; DISABLE-NEXT: movl %ecx, (%rax)
; DISABLE-NEXT: jmp LBB15_3
; DISABLE-NEXT: LBB15_2: ## %else
; DISABLE-NEXT: xorl %edi, %edi
; DISABLE-NEXT: xorl %esi, %esi
; DISABLE-NEXT: callq _doSomething
; DISABLE-NEXT: movl %eax, %esi
; DISABLE-NEXT: LBB15_3: ## %exit
; DISABLE-NEXT: movl %esi, %eax
; DISABLE-NEXT: popq %rcx
; DISABLE-NEXT: retq
entry:
br i1 %bool1, label %master, label %else
master:
%tmp1 = load i32, i32* %sum1, align 4
store i32 %tmp1, i32* @sum1, align 4
br label %exit
else:
%call = call i32 @doSomething(i32 0, i32* null)
br label %exit
exit:
%res = phi i32 [ %arg, %master], [ %call, %else ]
ret i32 %res
}
attributes #3 = { nounwind }
@irreducibleCFGa = common global i32 0, align 4
@irreducibleCFGf = common global i8 0, align 1
@irreducibleCFGb = common global i32 0, align 4
; Check that we do not run shrink-wrapping on irreducible CFGs until
; it is actually supported.
; At the moment, on those CFGs the loop information may be incorrect
; and since we use that information to do the placement, we may end up
; inserting the prologue/epilogue at incorrect places.
; PR25988.
; Make sure we emit missed optimization remarks for this.
; REMARKS: Pass: shrink-wrap
; REMARKS-NEXT: Name: UnsupportedIrreducibleCFG
; REMARKS-NEXT: Function: irreducibleCFG
; REMARKS-NEXT: Args:
; REMARKS-NEXT: - String: Irreducible CFGs are not supported yet
define i32 @irreducibleCFG() #4 {
; ENABLE-LABEL: irreducibleCFG:
; ENABLE: ## %bb.0: ## %entry
; ENABLE-NEXT: pushq %rbp
; ENABLE-NEXT: .cfi_def_cfa_offset 16
; ENABLE-NEXT: .cfi_offset %rbp, -16
; ENABLE-NEXT: movq %rsp, %rbp
; ENABLE-NEXT: .cfi_def_cfa_register %rbp
; ENABLE-NEXT: pushq %rbx
; ENABLE-NEXT: pushq %rax
; ENABLE-NEXT: .cfi_offset %rbx, -24
; ENABLE-NEXT: movq _irreducibleCFGf@{{.*}}(%rip), %rax
; ENABLE-NEXT: cmpb $0, (%rax)
; ENABLE-NEXT: je LBB16_2
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB16_1: ## %preheader
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: jmp LBB16_1
; ENABLE-NEXT: LBB16_2: ## %split
; ENABLE-NEXT: movq _irreducibleCFGb@{{.*}}(%rip), %rax
; ENABLE-NEXT: cmpl $0, (%rax)
; ENABLE-NEXT: je LBB16_3
; ENABLE-NEXT: ## %bb.4: ## %for.body4.i
; ENABLE-NEXT: movq _irreducibleCFGa@{{.*}}(%rip), %rax
; ENABLE-NEXT: movl (%rax), %edi
; ENABLE-NEXT: xorl %ebx, %ebx
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: callq _something
; ENABLE-NEXT: jmp LBB16_5
; ENABLE-NEXT: LBB16_3:
; ENABLE-NEXT: xorl %ebx, %ebx
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB16_5: ## %for.inc
; ENABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: incl %ebx
; ENABLE-NEXT: cmpl $7, %ebx
; ENABLE-NEXT: jl LBB16_5
; ENABLE-NEXT: ## %bb.6: ## %fn1.exit
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: addq $8, %rsp
; ENABLE-NEXT: popq %rbx
; ENABLE-NEXT: popq %rbp
; ENABLE-NEXT: retq
;
; DISABLE-LABEL: irreducibleCFG:
; DISABLE: ## %bb.0: ## %entry
; DISABLE-NEXT: pushq %rbp
; DISABLE-NEXT: .cfi_def_cfa_offset 16
; DISABLE-NEXT: .cfi_offset %rbp, -16
; DISABLE-NEXT: movq %rsp, %rbp
; DISABLE-NEXT: .cfi_def_cfa_register %rbp
; DISABLE-NEXT: pushq %rbx
; DISABLE-NEXT: pushq %rax
; DISABLE-NEXT: .cfi_offset %rbx, -24
; DISABLE-NEXT: movq _irreducibleCFGf@{{.*}}(%rip), %rax
; DISABLE-NEXT: cmpb $0, (%rax)
; DISABLE-NEXT: je LBB16_2
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB16_1: ## %preheader
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: jmp LBB16_1
; DISABLE-NEXT: LBB16_2: ## %split
; DISABLE-NEXT: movq _irreducibleCFGb@{{.*}}(%rip), %rax
; DISABLE-NEXT: cmpl $0, (%rax)
; DISABLE-NEXT: je LBB16_3
; DISABLE-NEXT: ## %bb.4: ## %for.body4.i
; DISABLE-NEXT: movq _irreducibleCFGa@{{.*}}(%rip), %rax
; DISABLE-NEXT: movl (%rax), %edi
; DISABLE-NEXT: xorl %ebx, %ebx
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: callq _something
; DISABLE-NEXT: jmp LBB16_5
; DISABLE-NEXT: LBB16_3:
; DISABLE-NEXT: xorl %ebx, %ebx
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB16_5: ## %for.inc
; DISABLE-NEXT: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: incl %ebx
; DISABLE-NEXT: cmpl $7, %ebx
; DISABLE-NEXT: jl LBB16_5
; DISABLE-NEXT: ## %bb.6: ## %fn1.exit
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: addq $8, %rsp
; DISABLE-NEXT: popq %rbx
; DISABLE-NEXT: popq %rbp
; DISABLE-NEXT: retq
entry:
%i0 = load i32, i32* @irreducibleCFGa, align 4
%.pr = load i8, i8* @irreducibleCFGf, align 1
%bool = icmp eq i8 %.pr, 0
br i1 %bool, label %split, label %preheader
preheader:
br label %preheader
split:
%i1 = load i32, i32* @irreducibleCFGb, align 4
%tobool1.i = icmp ne i32 %i1, 0
br i1 %tobool1.i, label %for.body4.i, label %for.cond8.i.preheader
for.body4.i:
%call.i = tail call i32 (...) @something(i32 %i0)
br label %for.cond8
for.cond8:
%p1 = phi i32 [ %inc18.i, %for.inc ], [ 0, %for.body4.i ]
%.pr1.pr = load i32, i32* @irreducibleCFGb, align 4
br label %for.cond8.i.preheader
for.cond8.i.preheader:
%.pr1 = phi i32 [ %.pr1.pr, %for.cond8 ], [ %i1, %split ]
%p13 = phi i32 [ %p1, %for.cond8 ], [ 0, %split ]
br label %for.inc
fn1.exit:
ret i32 0
for.inc:
%inc18.i = add nuw nsw i32 %p13, 1
%cmp = icmp slt i32 %inc18.i, 7
br i1 %cmp, label %for.cond8, label %fn1.exit
}
attributes #4 = { "frame-pointer"="all" }
@x = external global i32, align 4
@y = external global i32, align 4
; The post-dominator tree does not include the branch containing the infinite
; loop, which can occur into a misplacement of the restore block, if we're
; looking for the nearest common post-dominator of an "unreachable" block.
define void @infiniteLoopNoSuccessor() #5 {
; ENABLE-LABEL: infiniteLoopNoSuccessor:
; ENABLE: ## %bb.0:
; ENABLE-NEXT: pushq %rbp
; ENABLE-NEXT: movq %rsp, %rbp
; ENABLE-NEXT: movq _x@{{.*}}(%rip), %rax
; ENABLE-NEXT: cmpl $0, (%rax)
; ENABLE-NEXT: je LBB17_2
; ENABLE-NEXT: ## %bb.1:
; ENABLE-NEXT: movl $0, (%rax)
; ENABLE-NEXT: LBB17_2:
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: callq _somethingElse
; ENABLE-NEXT: movq _y@{{.*}}(%rip), %rax
; ENABLE-NEXT: cmpl $0, (%rax)
; ENABLE-NEXT: je LBB17_3
; ENABLE-NEXT: ## %bb.5:
; ENABLE-NEXT: popq %rbp
; ENABLE-NEXT: retq
; ENABLE-NEXT: LBB17_3:
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: callq _something
; ENABLE-NEXT: .p2align 4, 0x90
; ENABLE-NEXT: LBB17_4: ## =>This Inner Loop Header: Depth=1
; ENABLE-NEXT: xorl %eax, %eax
; ENABLE-NEXT: callq _somethingElse
; ENABLE-NEXT: jmp LBB17_4
;
; DISABLE-LABEL: infiniteLoopNoSuccessor:
; DISABLE: ## %bb.0:
; DISABLE-NEXT: pushq %rbp
; DISABLE-NEXT: movq %rsp, %rbp
; DISABLE-NEXT: movq _x@{{.*}}(%rip), %rax
; DISABLE-NEXT: cmpl $0, (%rax)
; DISABLE-NEXT: je LBB17_2
; DISABLE-NEXT: ## %bb.1:
; DISABLE-NEXT: movl $0, (%rax)
; DISABLE-NEXT: LBB17_2:
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: callq _somethingElse
; DISABLE-NEXT: movq _y@{{.*}}(%rip), %rax
; DISABLE-NEXT: cmpl $0, (%rax)
; DISABLE-NEXT: je LBB17_3
; DISABLE-NEXT: ## %bb.5:
; DISABLE-NEXT: popq %rbp
; DISABLE-NEXT: retq
; DISABLE-NEXT: LBB17_3:
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: callq _something
; DISABLE-NEXT: .p2align 4, 0x90
; DISABLE-NEXT: LBB17_4: ## =>This Inner Loop Header: Depth=1
; DISABLE-NEXT: xorl %eax, %eax
; DISABLE-NEXT: callq _somethingElse
; DISABLE-NEXT: jmp LBB17_4
%1 = load i32, i32* @x, align 4
%2 = icmp ne i32 %1, 0
br i1 %2, label %3, label %4
; <label>:3:
store i32 0, i32* @x, align 4
br label %4
; <label>:4:
call void (...) @somethingElse()
%5 = load i32, i32* @y, align 4
%6 = icmp ne i32 %5, 0
br i1 %6, label %10, label %7
; <label>:7:
%8 = call i32 (...) @something()
br label %9
; <label>:9:
call void (...) @somethingElse()
br label %9
; <label>:10:
ret void
}
declare void @somethingElse(...)
attributes #5 = { nounwind "frame-pointer"="non-leaf" }