Pull in r148240 from upstream llvm trunk:
Make sure the non-SSE lowering for fences correctly clobbers EFLAGS. PR11768. In particular, this fixes segfaults during the build of devel/icu on i386. The __sync_synchronize() builtin used for implementing icu's internal barrier could lead to incorrect behaviour. MFC after: 3 days
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=230393
@ -533,7 +533,7 @@ def ATOMSWAP6432 : I<0, Pseudo, (outs GR32:$dst1, GR32:$dst2),
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// Memory barriers
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// TODO: Get this to fold the constant into the instruction.
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let isCodeGenOnly = 1 in
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let isCodeGenOnly = 1, Defs = [EFLAGS] in
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def OR32mrLocked : I<0x09, MRMDestMem, (outs), (ins i32mem:$dst, GR32:$zero),
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"lock\n\t"
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"or{l}\t{$zero, $dst|$dst, $zero}",
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