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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.

llvm-svn: 184207
This commit is contained in:
Stefanus Du Toit 2013-06-18 17:08:10 +00:00
parent 18bf1abdc7
commit aa267b3e82
3 changed files with 22 additions and 0 deletions
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7
lib/Target/X86/X86InstrTSX.td
View File

@ -37,3 +37,10 @@ def XTEST : I<0x01, MRM_D6, (outs), (ins),
def XABORT : Ii8<0xc6, MRM_F8, (outs), (ins i8imm:$imm),
"xabort\t$imm",
[(int_x86_xabort imm:$imm)]>, Requires<[HasRTM]>;
// HLE prefixes
def XACQUIRE_PREFIX : I<0xF2, RawFrm, (outs), (ins), "xacquire", []>, Requires<[HasHLE]>;
def XRELEASE_PREFIX : I<0xF3, RawFrm, (outs), (ins), "xrelease", []>, Requires<[HasHLE]>;

9
test/MC/X86/x86_64-hle-encoding.s Normal file
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@ -0,0 +1,9 @@
// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
// CHECK: xacquire
// CHECK: [0xf2]
xacquire
// CHECK: xrelease
// CHECK: [0xf3]
xrelease

6
utils/TableGen/X86RecognizableInstr.cpp
View File

@ -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)))