derek.holloway
7502bf64a4
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29 lines
894 B
LLVM
29 lines
894 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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@val = internal global i64 0
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@"\01LC" = internal constant [7 x i8] c"0x%lx\0A\00"
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define i32 @main() nounwind {
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; CHECK-LABEL: main:
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; CHECK: ## %bb.0: ## %entry
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: movl $1, %ecx
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: lock cmpxchgq %rcx, _val(%rip)
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; CHECK-NEXT: leaq LC(%rip), %rdi
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; CHECK-NEXT: movq %rax, %rsi
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: callq _printf
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; CHECK-NEXT: xorl %eax, %eax
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; CHECK-NEXT: popq %rcx
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; CHECK-NEXT: retq
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entry:
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%t0 = cmpxchg ptr @val, i64 0, i64 1 monotonic monotonic
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%0 = extractvalue { i64, i1 } %t0, 0
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%1 = tail call i32 (ptr, ...) @printf(ptr @"\01LC", i64 %0) nounwind
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ret i32 0
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}
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declare i32 @printf(ptr, ...) nounwind
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