[X86][InlineAsm][Ms Compatibility]Prefer variable name over a register when the two collides
On MS-style, the following snippet: int eax; __asm mov eax, ebx should yield loading of ebx, into the location pointed by the variable eax This patch sees to it. Currently, a reg-to-reg move would have been invoked. clang: D34740 Differential Revision: https://reviews.llvm.org/D34739 llvm-svn: 308866
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@ -944,7 +944,8 @@ bool X86AsmParser::ParseRegister(unsigned &RegNo,
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EndLoc = Tok.getEndLoc();
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if (Tok.isNot(AsmToken::Identifier)) {
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if (isParsingIntelSyntax()) return true;
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if (isParsingIntelSyntax())
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return true;
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return Error(StartLoc, "invalid register name",
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SMRange(StartLoc, EndLoc));
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}
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@ -955,6 +956,16 @@ bool X86AsmParser::ParseRegister(unsigned &RegNo,
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if (RegNo == 0)
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RegNo = MatchRegisterName(Tok.getString().lower());
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// In MS inline-asm we allow variables to be named as registers, and
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// give them precedence over actual registers
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// However - we require the match to be case sensitive
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if (isParsingInlineAsm() && isParsingIntelSyntax() && RegNo) {
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StringRef LineBuf(Tok.getIdentifier().data());
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InlineAsmIdentifierInfo Info;
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if (SemaCallback->LookupInlineAsmIdentifier(LineBuf, Info, false))
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return true;
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}
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// The "flags" register cannot be referenced directly.
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// Treat it as an identifier instead.
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if (isParsingInlineAsm() && isParsingIntelSyntax() && RegNo == X86::EFLAGS)
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