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19 lines
661 B
LLVM
19 lines
661 B
LLVM
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; RUN: llc < %s -march=x86-64 | FileCheck %s
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; rdar://9692967
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define void @do_the_sync(i64* %p, i32 %b) nounwind {
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entry:
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%p.addr = alloca i64*, align 8
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store i64* %p, i64** %p.addr, align 8
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%tmp = load i64** %p.addr, align 8
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call void @llvm.memory.barrier(i1 true, i1 true, i1 true, i1 true, i1 true)
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; CHECK: lock
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; CHECK-NEXT: orq $2147483648
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%0 = call i64 @llvm.atomic.load.or.i64.p0i64(i64* %tmp, i64 2147483648)
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call void @llvm.memory.barrier(i1 true, i1 true, i1 true, i1 true, i1 true)
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ret void
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}
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declare i64 @llvm.atomic.load.or.i64.p0i64(i64* nocapture, i64) nounwind
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declare void @llvm.memory.barrier(i1, i1, i1, i1, i1) nounwind
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