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