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Fix assembling of xchg %eax, %eax to not use the NOP encoding of 0x90. This was done by creating a new register group that excludes AX registers. Fixes PR10345. Also added aliases for flipping the order of the operands of xchg <reg>, %eax.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141274 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper
2011-10-06 06:44:41 +00:00
parent cf2adb945a
commit 7ea16b01fa
6 changed files with 71 additions and 3 deletions
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6
utils/TableGen/X86RecognizableInstr.cpp
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@ -1064,6 +1064,9 @@ OperandType RecognizableInstr::typeFromString(const std::string &s,
TYPE("offset32", TYPE_MOFFS32)
TYPE("offset64", TYPE_MOFFS64)
TYPE("VR256", TYPE_XMM256)
TYPE("GR16_NOAX", TYPE_Rv)
TYPE("GR32_NOAX", TYPE_Rv)
TYPE("GR64_NOAX", TYPE_R64)
errs() << "Unhandled type string " << s << "\n";
llvm_unreachable("Unhandled type string");
}
@ -1205,6 +1208,9 @@ OperandEncoding RecognizableInstr::opcodeModifierEncodingFromString
ENCODING("GR64", ENCODING_RO)
ENCODING("GR16", ENCODING_Rv)
ENCODING("GR8", ENCODING_RB)
ENCODING("GR16_NOAX", ENCODING_Rv)
ENCODING("GR32_NOAX", ENCODING_Rv)
ENCODING("GR64_NOAX", ENCODING_RO)
errs() << "Unhandled opcode modifier encoding " << s << "\n";
llvm_unreachable("Unhandled opcode modifier encoding");
}