llvm/test/CodeGen/X86/clobber_frame_ptr.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
; RUN: llc -mtriple=x86_64-pc-linux -stackrealign -verify-machineinstrs < %s | FileCheck %s

; Calling convention ghccc uses ebp to pass parameter, so calling a function
; using ghccc clobbers ebp. We should save and restore ebp around such a call
; if ebp is used as frame pointer.

declare ghccc i32 @external(i32)

; Basic test with ghccc calling convention.
define i32 @test1(i32 %0, i32 %1) {
; CHECK-LABEL: test1:
; CHECK:       # %bb.0:
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    .cfi_offset %rbp, -16
; CHECK-NEXT:    movq %rsp, %rbp
; CHECK-NEXT:    .cfi_def_cfa_register %rbp
; CHECK-NEXT:    pushq %r15
; CHECK-NEXT:    pushq %r14
; CHECK-NEXT:    pushq %r13
; CHECK-NEXT:    pushq %r12
; CHECK-NEXT:    pushq %rbx
; CHECK-NEXT:    andq $-16, %rsp
; CHECK-NEXT:    subq $16, %rsp
; CHECK-NEXT:    .cfi_offset %rbx, -56
; CHECK-NEXT:    .cfi_offset %r12, -48
; CHECK-NEXT:    .cfi_offset %r13, -40
; CHECK-NEXT:    .cfi_offset %r14, -32
; CHECK-NEXT:    .cfi_offset %r15, -24
; CHECK-NEXT:    # kill: def $edi killed $edi def $rdi
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    pushq %rax
; CHECK-NEXT:    .cfi_remember_state
; CHECK-NEXT:    .cfi_escape 0x0f, 0x06, 0x77, 0x08, 0x06, 0x11, 0x10, 0x22 #
; CHECK-NEXT:    movl %esi, %ebp
; CHECK-NEXT:    movq %rdi, %r13
; CHECK-NEXT:    callq external@PLT
; CHECK-NEXT:    addq $8, %rsp
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_restore_state
; CHECK-NEXT:    leaq -40(%rbp), %rsp
; CHECK-NEXT:    popq %rbx
; CHECK-NEXT:    popq %r12
; CHECK-NEXT:    popq %r13
; CHECK-NEXT:    popq %r14
; CHECK-NEXT:    popq %r15
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_def_cfa %rsp, 8
; CHECK-NEXT:    retq
    %x = call ghccc i32 @external(i32 %0, i32 %1)
    ret i32 %x
}

; Calling convention hipe has similar behavior. It clobbers rbp but not rbx.

declare cc 11 i64 @hipe1(i64)
declare cc 11 i64 @hipe2(i64, i64, i64, i64, i64, i64, i64)

; Basic test with hipe calling convention.
define i64 @test2(i64 %a0, i64 %a1) {
; CHECK-LABEL: test2:
; CHECK:       # %bb.0:
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    .cfi_offset %rbp, -16
; CHECK-NEXT:    movq %rsp, %rbp
; CHECK-NEXT:    .cfi_def_cfa_register %rbp
; CHECK-NEXT:    pushq %r15
; CHECK-NEXT:    pushq %r14
; CHECK-NEXT:    pushq %r13
; CHECK-NEXT:    pushq %r12
; CHECK-NEXT:    pushq %rbx
; CHECK-NEXT:    andq $-16, %rsp
; CHECK-NEXT:    subq $16, %rsp
; CHECK-NEXT:    .cfi_offset %rbx, -56
; CHECK-NEXT:    .cfi_offset %r12, -48
; CHECK-NEXT:    .cfi_offset %r13, -40
; CHECK-NEXT:    .cfi_offset %r14, -32
; CHECK-NEXT:    .cfi_offset %r15, -24
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    pushq %rax
; CHECK-NEXT:    .cfi_remember_state
; CHECK-NEXT:    .cfi_escape 0x0f, 0x06, 0x77, 0x08, 0x06, 0x11, 0x10, 0x22 #
; CHECK-NEXT:    movq %rsi, %rbp
; CHECK-NEXT:    movq %rdi, %r15
; CHECK-NEXT:    callq hipe1@PLT
; CHECK-NEXT:    addq $8, %rsp
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_restore_state
; CHECK-NEXT:    movq %r15, %rax
; CHECK-NEXT:    leaq -40(%rbp), %rsp
; CHECK-NEXT:    popq %rbx
; CHECK-NEXT:    popq %r12
; CHECK-NEXT:    popq %r13
; CHECK-NEXT:    popq %r14
; CHECK-NEXT:    popq %r15
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_def_cfa %rsp, 8
; CHECK-NEXT:    retq
  %x = call cc 11 i64 @hipe1(i64 %a0, i64 %a1)
  ret i64 %x
}

@buf = dso_local global [20 x ptr] zeroinitializer, align 16

; longjmp modifies fp, it is expected behavior, wo should not save/restore fp
; around it.
define void @test4() {
; CHECK-LABEL: test4:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    .cfi_offset %rbp, -16
; CHECK-NEXT:    movq %rsp, %rbp
; CHECK-NEXT:    .cfi_def_cfa_register %rbp
; CHECK-NEXT:    pushq %r15
; CHECK-NEXT:    pushq %r14
; CHECK-NEXT:    pushq %r13
; CHECK-NEXT:    pushq %r12
; CHECK-NEXT:    pushq %rbx
; CHECK-NEXT:    andq $-16, %rsp
; CHECK-NEXT:    subq $16, %rsp
; CHECK-NEXT:    .cfi_offset %rbx, -56
; CHECK-NEXT:    .cfi_offset %r12, -48
; CHECK-NEXT:    .cfi_offset %r13, -40
; CHECK-NEXT:    .cfi_offset %r14, -32
; CHECK-NEXT:    .cfi_offset %r15, -24
; CHECK-NEXT:    xorl %r13d, %r13d
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    pushq %rax
; CHECK-NEXT:    .cfi_remember_state
; CHECK-NEXT:    .cfi_escape 0x0f, 0x06, 0x77, 0x08, 0x06, 0x11, 0x10, 0x22 #
; CHECK-NEXT:    callq external@PLT
; CHECK-NEXT:    addq $8, %rsp
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_restore_state
; CHECK-NEXT:    movq buf(%rip), %rbp
; CHECK-NEXT:    movq buf+8(%rip), %rax
; CHECK-NEXT:    movq buf+16(%rip), %rsp
; CHECK-NEXT:    jmpq *%rax
entry:
  %x = call ghccc i32 @external(i32 0)
  call void @llvm.eh.sjlj.longjmp(ptr @buf)
  unreachable
}

declare ghccc void @tail()

; We should not save/restore fp/bp around terminator.
define ghccc void @test5() {
; CHECK-LABEL: test5:
; CHECK:       # %bb.0: # %entry
; CHECK-NEXT:    pushq %rbp
; CHECK-NEXT:    .cfi_def_cfa_offset 16
; CHECK-NEXT:    .cfi_offset %rbp, -16
; CHECK-NEXT:    movq %rsp, %rbp
; CHECK-NEXT:    .cfi_def_cfa_register %rbp
; CHECK-NEXT:    andq $-8, %rsp
; CHECK-NEXT:    testb %al, %al
; CHECK-NEXT:    jne .LBB3_2
; CHECK-NEXT:  # %bb.1: # %then
; CHECK-NEXT:    movq $0, (%rax)
; CHECK-NEXT:    movq %rbp, %rsp
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_def_cfa %rsp, 8
; CHECK-NEXT:    retq
; CHECK-NEXT:  .LBB3_2: # %else
; CHECK-NEXT:    .cfi_def_cfa %rbp, 16
; CHECK-NEXT:    movq %rbp, %rsp
; CHECK-NEXT:    popq %rbp
; CHECK-NEXT:    .cfi_def_cfa %rsp, 8
; CHECK-NEXT:    jmp tail@PLT # TAILCALL
entry:
  br i1 poison, label %then, label %else

then:
  store i64 0, ptr undef
  br label %exit

else:
  musttail call ghccc void @tail()
  ret void

exit:
  ret void
}