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Implement the data16 prefix.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120224 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-11-27 20:29:45 +00:00
parent b837f587ed
commit bfd2d26159
3 changed files with 5 additions and 1 deletions
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2
lib/Target/X86/AsmParser/X86AsmParser.cpp
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@ -708,7 +708,7 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
Name == "lock" || Name == "rep" ||
Name == "repe" || Name == "repz" ||
Name == "repne" || Name == "repnz" ||
Name == "rex64";
Name == "rex64" || Name == "data16";
// This does the actual operand parsing. Don't parse any more if we have a

3
lib/Target/X86/X86InstrInfo.td
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@ -1147,6 +1147,9 @@ def LOCK_PREFIX : I<0xF0, RawFrm, (outs), (ins), "lock", []>;
// Rex64 instruction prefix
def REX64_PREFIX : I<0x48, RawFrm, (outs), (ins), "rex64", []>;
// Data16 instruction prefix
def DATA16_PREFIX : I<0x66, RawFrm, (outs), (ins), "data16", []>;
// Repeat string operation instruction prefixes
// These uses the DF flag in the EFLAGS register to inc or dec ECX
let Defs = [ECX], Uses = [ECX,EFLAGS] in {

1
test/MC/X86/x86-64.s
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@ -910,3 +910,4 @@ movq %rax, %mm5 // CHECK: movd %rax, %mm5 # encoding: [0x48,0x0f,0x6e,0xe8]
movq %mm5, %rbx // CHECK: movd %mm5, %rbx # encoding: [0x48,0x0f,0x7e,0xeb]
rex64 // CHECK: rex64 # encoding: [0x48]
data16 // CHECK: data16 # encoding: [0x66]