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https://github.com/c64scene-ar/llvm-6502.git
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17991c3234
simply does the atomic.cmp.swap on the larger type, which means it blows away whatever is sitting in the bytes just after the memory location, i.e. causes a buffer overflow. This really requires target specific code, which is why LegalizeTypes doesn't try to handle this case generically. The existing (wrong) code in LegalizeDAG will go away automatically once the type legalization code is removed from LegalizeDAG so I'm leaving it there for the moment. Meanwhile, don't test for this feature. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53669 91177308-0d34-0410-b5e6-96231b3b80d8
22 lines
726 B
LLVM
22 lines
726 B
LLVM
; RUN: llvm-as < %s | llc -march=ppc32 | grep lwarx | count 3
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; RUN: llvm-as < %s | llc -march=ppc32 | grep stwcx. | count 3
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define i32 @exchange_and_add(i32* %mem, i32 %val) nounwind {
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%tmp = call i32 @llvm.atomic.load.add.i32( i32* %mem, i32 %val )
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ret i32 %tmp
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}
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define i32 @exchange_and_cmp(i32* %mem) nounwind {
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%tmp = call i32 @llvm.atomic.cmp.swap.i32( i32* %mem, i32 0, i32 1 )
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ret i32 %tmp
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}
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define i32 @exchange(i32* %mem, i32 %val) nounwind {
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%tmp = call i32 @llvm.atomic.swap.i32( i32* %mem, i32 1 )
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ret i32 %tmp
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}
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declare i32 @llvm.atomic.load.add.i32(i32*, i32) nounwind
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declare i32 @llvm.atomic.cmp.swap.i32(i32*, i32, i32) nounwind
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declare i32 @llvm.atomic.swap.i32(i32*, i32) nounwind
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