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Implement x86 asm parsing support for %st and %st(4)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95634 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-02-09 00:49:22 +00:00
parent ddea94a819
commit e16b0fc3cb
2 changed files with 42 additions and 0 deletions
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35
lib/Target/X86/AsmParser/X86AsmParser.cpp
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@ -292,6 +292,41 @@ bool X86ATTAsmParser::ParseRegister(unsigned &RegNo,
// validation later, so maybe there is no need for this here.
RegNo = MatchRegisterName(Tok.getString());
// Parse %st(1) and "%st" as "%st(0)"
if (RegNo == 0 && Tok.getString() == "st") {
RegNo = X86::ST0;
EndLoc = Tok.getLoc();
Parser.Lex(); // Eat 'st'
// Check to see if we have '(4)' after %st.
if (getLexer().isNot(AsmToken::LParen))
return false;
// Lex the paren.
getParser().Lex();
const AsmToken &IntTok = Parser.getTok();
if (IntTok.isNot(AsmToken::Integer))
return Error(IntTok.getLoc(), "expected stack index");
switch (IntTok.getIntVal()) {
case 0: RegNo = X86::ST0; break;
case 1: RegNo = X86::ST1; break;
case 2: RegNo = X86::ST2; break;
case 3: RegNo = X86::ST3; break;
case 4: RegNo = X86::ST4; break;
case 5: RegNo = X86::ST5; break;
case 6: RegNo = X86::ST6; break;
case 7: RegNo = X86::ST7; break;
default: return Error(IntTok.getLoc(), "invalid stack index");
}
if (getParser().Lex().isNot(AsmToken::RParen))
return Error(Parser.getTok().getLoc(), "expected ')'");
EndLoc = Tok.getLoc();
Parser.Lex(); // Eat ')'
return false;
}
if (RegNo == 0)
return Error(Tok.getLoc(), "invalid register name");

7
test/MC/AsmParser/X86/x86_instructions.s
View File

@ -136,3 +136,10 @@
// CHECK: movb 0(%eax), %al
gs;movb 0(%eax), %al
// CHECK: fadd %st(0)
// CHECK: fadd %st(1)
// CHECK: fadd %st(7)
fadd %st(0)
fadd %st(1)
fadd %st(7)