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gas accepts xchg <mem>, <reg> as a synonym for xchg <reg>, <mem>. 

Add this to the mc assembler, fixing PR8061

llvm-svn: 113346
This commit is contained in:
Chris Lattner 2010-09-08 04:53:27 +00:00
parent 7a23aa081a
commit 8caea68a4f
2 changed files with 16 additions and 0 deletions
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11
llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -753,6 +753,7 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
PatchedName = "vpclmulqdq";
}
}
Operands.push_back(X86Operand::CreateToken(PatchedName, NameLoc));
if (ExtraImmOp)
@ -827,6 +828,16 @@ ParseInstruction(StringRef Name, SMLoc NameLoc,
delete Operands[0];
Operands[0] = X86Operand::CreateToken("sldtw", NameLoc);
}
// The assembler accepts "xchgX <reg>, <mem>" and "xchgX <mem>, <reg>" as
// synonyms. Our tables only have the "<reg>, <mem>" form, so if we see the
// other operand order, swap them.
if (Name == "xchgb" || Name == "xchgw" || Name == "xchgl" || Name == "xchgq")
if (Operands.size() == 3 &&
static_cast<X86Operand*>(Operands[1])->isMem() &&
static_cast<X86Operand*>(Operands[2])->isReg()) {
std::swap(Operands[1], Operands[2]);
}
return false;
}

5
llvm/test/MC/AsmParser/X86/x86_64-new-encoder.s
View File

@ -168,3 +168,8 @@ L1:
// CHECK: jrcxz L1
// CHECK: encoding: [0xe3,A]
// PR8061
xchgl 368(%rax),%ecx
// CHECK: xchgl %ecx, 368(%rax)
xchgl %ecx, 368(%rax)
// CHECK: xchgl %ecx, 368(%rax)