| ; 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) |