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Revert part of r141274. Only need to change encoding for xchg %eax, %eax in 64-bit mode. This is because in 64-bit mode xchg %eax, %eax implies zeroing the upper 32-bits of RAX which makes it not a NOP. In 32-bit mode using NOP encoding is fine.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141353 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper
2011-10-07 05:35:38 +00:00
parent 217f0e9ca4
commit 25f6dfd108
5 changed files with 21 additions and 25 deletions
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utils/TableGen/X86DisassemblerTables.cpp
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@@ -620,6 +620,7 @@ void DisassemblerTables::setTableFields(ModRMDecision &decision,
if(previousInfo.name == "NOOP" && (newInfo.name == "XCHG16ar" ||
newInfo.name == "XCHG32ar" ||
newInfo.name == "XCHG32ar64" ||
newInfo.name == "XCHG64ar"))
continue; // special case for XCHG*ar and NOOP