34 lines
1.1 KiB
LLVM
34 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
|
|
; RUN: llc -O0 -fast-isel -mtriple=x86_64-- < %s | FileCheck %s
|
|
|
|
define i32 @test(i64 %arg) nounwind {
|
|
; CHECK-LABEL: test:
|
|
; CHECK: # %bb.0: # %entry
|
|
; CHECK-NEXT: subq $1, %rdi
|
|
; CHECK-NEXT: setb %cl
|
|
; CHECK-NEXT: xorl %eax, %eax
|
|
; CHECK-NEXT: testb $1, %cl
|
|
; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
|
|
; CHECK-NEXT: jne .LBB0_2
|
|
; CHECK-NEXT: # %bb.1: # %no_overflow
|
|
; CHECK-NEXT: movl $1, %eax
|
|
; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
|
|
; CHECK-NEXT: jmp .LBB0_2
|
|
; CHECK-NEXT: .LBB0_2: # %merge
|
|
; CHECK-NEXT: movl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Reload
|
|
; CHECK-NEXT: retq
|
|
entry:
|
|
%usubo = tail call { i64, i1 } @llvm.usub.with.overflow.i64(i64 %arg, i64 1)
|
|
%overflow = extractvalue { i64, i1 } %usubo, 1
|
|
br i1 %overflow, label %merge, label %no_overflow
|
|
|
|
no_overflow:
|
|
br label %merge
|
|
|
|
merge:
|
|
%phi = phi i32 [ 1, %no_overflow ], [ 0, %entry ]
|
|
ret i32 %phi
|
|
}
|
|
|
|
declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64)
|