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c537f79dcd
- Clear 'mayStore' flag when loading from the atomic variable before the spin loop - Clear kill flag from one use to multiple use in registers forming the address to that atomic variable - don't use a physical register as live-in register in BB (neither entry nor landing pad.) by copying it into virtual register (patch by Cameron Zwarich) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176538 91177308-0d34-0410-b5e6-96231b3b80d8
29 lines
713 B
LLVM
29 lines
713 B
LLVM
; RUN: llc < %s -march=x86-64 -verify-machineinstrs | FileCheck %s
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; rdar://9692967
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define void @t1(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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; CHECK: t1:
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; CHECK: movl $2147483648, %eax
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; CHECK: lock
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; CHECK-NEXT: orq %r{{.*}}, (%r{{.*}})
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%0 = atomicrmw or i64* %tmp, i64 2147483648 seq_cst
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ret void
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}
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define void @t2(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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; CHECK: t2:
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; CHECK: lock
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; CHECK-NEXT: orq $2147483644, (%r{{.*}})
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%0 = atomicrmw or i64* %tmp, i64 2147483644 seq_cst
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ret void
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}
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