| ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py |
| ; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s |
| |
| ; CodeGenPrepare is expected to form overflow intrinsics to improve DAG/isel. |
| |
| define i1 @usubo_ult_i64(i64 %x, i64 %y, i64* %p) nounwind { |
| ; CHECK-LABEL: usubo_ult_i64: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: subq %rsi, %rdi |
| ; CHECK-NEXT: movq %rdi, (%rdx) |
| ; CHECK-NEXT: setb %al |
| ; CHECK-NEXT: retq |
| %s = sub i64 %x, %y |
| store i64 %s, i64* %p |
| %ov = icmp ult i64 %x, %y |
| ret i1 %ov |
| } |
| |
| ; Verify insertion point for single-BB. Toggle predicate. |
| |
| define i1 @usubo_ugt_i32(i32 %x, i32 %y, i32* %p) nounwind { |
| ; CHECK-LABEL: usubo_ugt_i32: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: cmpl %edi, %esi |
| ; CHECK-NEXT: seta %al |
| ; CHECK-NEXT: subl %esi, %edi |
| ; CHECK-NEXT: movl %edi, (%rdx) |
| ; CHECK-NEXT: retq |
| %ov = icmp ugt i32 %y, %x |
| %s = sub i32 %x, %y |
| store i32 %s, i32* %p |
| ret i1 %ov |
| } |
| |
| ; Constant operand should match. |
| |
| define i1 @usubo_ugt_constant_op0_i8(i8 %x, i8* %p) nounwind { |
| ; CHECK-LABEL: usubo_ugt_constant_op0_i8: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movb $42, %cl |
| ; CHECK-NEXT: subb %dil, %cl |
| ; CHECK-NEXT: cmpb $42, %dil |
| ; CHECK-NEXT: seta %al |
| ; CHECK-NEXT: movb %cl, (%rsi) |
| ; CHECK-NEXT: retq |
| %s = sub i8 42, %x |
| %ov = icmp ugt i8 %x, 42 |
| store i8 %s, i8* %p |
| ret i1 %ov |
| } |
| |
| ; Compare with constant operand 0 is canonicalized by commuting, but verify match for non-canonical form. |
| |
| define i1 @usubo_ult_constant_op0_i16(i16 %x, i16* %p) nounwind { |
| ; CHECK-LABEL: usubo_ult_constant_op0_i16: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl $43, %ecx |
| ; CHECK-NEXT: subl %edi, %ecx |
| ; CHECK-NEXT: cmpw $43, %di |
| ; CHECK-NEXT: seta %al |
| ; CHECK-NEXT: movw %cx, (%rsi) |
| ; CHECK-NEXT: retq |
| %s = sub i16 43, %x |
| %ov = icmp ult i16 43, %x |
| store i16 %s, i16* %p |
| ret i1 %ov |
| } |
| |
| ; Subtract with constant operand 1 is canonicalized to add. |
| |
| define i1 @usubo_ult_constant_op1_i16(i16 %x, i16* %p) nounwind { |
| ; CHECK-LABEL: usubo_ult_constant_op1_i16: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: movl %edi, %ecx |
| ; CHECK-NEXT: addl $-44, %ecx |
| ; CHECK-NEXT: cmpw $44, %di |
| ; CHECK-NEXT: setb %al |
| ; CHECK-NEXT: movw %cx, (%rsi) |
| ; CHECK-NEXT: retq |
| %s = add i16 %x, -44 |
| %ov = icmp ult i16 %x, 44 |
| store i16 %s, i16* %p |
| ret i1 %ov |
| } |
| |
| define i1 @usubo_ugt_constant_op1_i8(i8 %x, i8* %p) nounwind { |
| ; CHECK-LABEL: usubo_ugt_constant_op1_i8: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: cmpb $45, %dil |
| ; CHECK-NEXT: setb %al |
| ; CHECK-NEXT: addb $-45, %dil |
| ; CHECK-NEXT: movb %dil, (%rsi) |
| ; CHECK-NEXT: retq |
| %ov = icmp ugt i8 45, %x |
| %s = add i8 %x, -45 |
| store i8 %s, i8* %p |
| ret i1 %ov |
| } |
| |
| ; Special-case: subtract 1 changes the compare predicate and constant. |
| |
| define i1 @usubo_eq_constant1_op1_i32(i32 %x, i32* %p) nounwind { |
| ; CHECK-LABEL: usubo_eq_constant1_op1_i32: |
| ; CHECK: # %bb.0: |
| ; CHECK-NEXT: # kill: def $edi killed $edi def $rdi |
| ; CHECK-NEXT: leal -1(%rdi), %ecx |
| ; CHECK-NEXT: testl %edi, %edi |
| ; CHECK-NEXT: sete %al |
| ; CHECK-NEXT: movl %ecx, (%rsi) |
| ; CHECK-NEXT: retq |
| %s = add i32 %x, -1 |
| %ov = icmp eq i32 %x, 0 |
| store i32 %s, i32* %p |
| ret i1 %ov |
| } |
| |
| ; Verify insertion point for multi-BB. |
| |
| declare void @call(i1) |
| |
| define i1 @usubo_ult_sub_dominates_i64(i64 %x, i64 %y, i64* %p, i1 %cond) nounwind { |
| ; CHECK-LABEL: usubo_ult_sub_dominates_i64: |
| ; CHECK: # %bb.0: # %entry |
| ; CHECK-NEXT: testb $1, %cl |
| ; CHECK-NEXT: je .LBB7_2 |
| ; CHECK-NEXT: # %bb.1: # %t |
| ; CHECK-NEXT: movq %rdi, %rax |
| ; CHECK-NEXT: subq %rsi, %rax |
| ; CHECK-NEXT: movq %rax, (%rdx) |
| ; CHECK-NEXT: testb $1, %cl |
| ; CHECK-NEXT: je .LBB7_2 |
| ; CHECK-NEXT: # %bb.3: # %end |
| ; CHECK-NEXT: cmpq %rsi, %rdi |
| ; CHECK-NEXT: setb %al |
| ; CHECK-NEXT: retq |
| ; CHECK-NEXT: .LBB7_2: # %f |
| ; CHECK-NEXT: movl %ecx, %eax |
| ; CHECK-NEXT: retq |
| entry: |
| br i1 %cond, label %t, label %f |
| |
| t: |
| %s = sub i64 %x, %y |
| store i64 %s, i64* %p |
| br i1 %cond, label %end, label %f |
| |
| f: |
| ret i1 %cond |
| |
| end: |
| %ov = icmp ult i64 %x, %y |
| ret i1 %ov |
| } |
| |
| define i1 @usubo_ult_cmp_dominates_i64(i64 %x, i64 %y, i64* %p, i1 %cond) nounwind { |
| ; CHECK-LABEL: usubo_ult_cmp_dominates_i64: |
| ; CHECK: # %bb.0: # %entry |
| ; CHECK-NEXT: pushq %rbp |
| ; CHECK-NEXT: pushq %r15 |
| ; CHECK-NEXT: pushq %r14 |
| ; CHECK-NEXT: pushq %rbx |
| ; CHECK-NEXT: pushq %rax |
| ; CHECK-NEXT: movl %ecx, %ebp |
| ; CHECK-NEXT: testb $1, %bpl |
| ; CHECK-NEXT: je .LBB8_2 |
| ; CHECK-NEXT: # %bb.1: # %t |
| ; CHECK-NEXT: movq %rdx, %r14 |
| ; CHECK-NEXT: movq %rsi, %r15 |
| ; CHECK-NEXT: movq %rdi, %rbx |
| ; CHECK-NEXT: xorl %edi, %edi |
| ; CHECK-NEXT: cmpq %rsi, %rbx |
| ; CHECK-NEXT: setb %dil |
| ; CHECK-NEXT: callq call |
| ; CHECK-NEXT: subq %r15, %rbx |
| ; CHECK-NEXT: jae .LBB8_2 |
| ; CHECK-NEXT: # %bb.4: # %end |
| ; CHECK-NEXT: setb %al |
| ; CHECK-NEXT: movq %rbx, (%r14) |
| ; CHECK-NEXT: jmp .LBB8_3 |
| ; CHECK-NEXT: .LBB8_2: # %f |
| ; CHECK-NEXT: movl %ebp, %eax |
| ; CHECK-NEXT: .LBB8_3: # %f |
| ; CHECK-NEXT: addq $8, %rsp |
| ; CHECK-NEXT: popq %rbx |
| ; CHECK-NEXT: popq %r14 |
| ; CHECK-NEXT: popq %r15 |
| ; CHECK-NEXT: popq %rbp |
| ; CHECK-NEXT: retq |
| entry: |
| br i1 %cond, label %t, label %f |
| |
| t: |
| %ov = icmp ult i64 %x, %y |
| call void @call(i1 %ov) |
| br i1 %ov, label %end, label %f |
| |
| f: |
| ret i1 %cond |
| |
| end: |
| %s = sub i64 %x, %y |
| store i64 %s, i64* %p |
| ret i1 %ov |
| } |
| |