1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc -O0 -fast-isel -mtriple=x86_64-- < %s | FileCheck %s 3 4define i32 @test(i64 %arg) nounwind { 5; CHECK-LABEL: test: 6; CHECK: # %bb.0: # %entry 7; CHECK-NEXT: subq $1, %rdi 8; CHECK-NEXT: setb %cl 9; CHECK-NEXT: xorl %eax, %eax 10; CHECK-NEXT: testb $1, %cl 11; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill 12; CHECK-NEXT: jne .LBB0_2 13; CHECK-NEXT: # %bb.1: # %no_overflow 14; CHECK-NEXT: movl $1, %eax 15; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill 16; CHECK-NEXT: jmp .LBB0_2 17; CHECK-NEXT: .LBB0_2: # %merge 18; CHECK-NEXT: movl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Reload 19; CHECK-NEXT: retq 20entry: 21 %usubo = tail call { i64, i1 } @llvm.usub.with.overflow.i64(i64 %arg, i64 1) 22 %overflow = extractvalue { i64, i1 } %usubo, 1 23 br i1 %overflow, label %merge, label %no_overflow 24 25no_overflow: 26 br label %merge 27 28merge: 29 %phi = phi i32 [ 1, %no_overflow ], [ 0, %entry ] 30 ret i32 %phi 31} 32 33declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64) 34