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Add support for encoding the HLE XACQUIRE and XRELEASE prefixes.

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For decoding, keep the current behavior of always decoding these as their REP
versions. In the future, this could be improved to recognize the cases where
these behave as XACQUIRE and XRELEASE and decode them as such.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184207 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stefanus Du Toit
2013-06-18 17:08:10 +00:00
parent 8ee23f00c7
commit 23306deb92
3 changed files with 22 additions and 0 deletions
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6
utils/TableGen/X86RecognizableInstr.cpp
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@@ -461,6 +461,12 @@ RecognizableInstr::filter_ret RecognizableInstr::filter() const {
Name == "VMOVQs64rr")
return FILTER_WEAK;
// XACQUIRE and XRELEASE reuse REPNE and REP respectively.
// For now, just prefer the REP versions.
if (Name == "XACQUIRE_PREFIX" ||
Name == "XRELEASE_PREFIX")
return FILTER_WEAK;
if (HasFROperands && Name.find("MOV") != Name.npos &&
((Name.find("2") != Name.npos && Name.find("32") == Name.npos) ||
(Name.find("to") != Name.npos)))