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Intel syntax: Parse memory operand with empty base reg, e.g. DWORD PTR [4*RDI]

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148721 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2012-01-23 20:20:06 +00:00
parent 8b31f95bdd
commit 3e08131185
2 changed files with 19 additions and 7 deletions
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22
lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -618,13 +618,23 @@ X86Operand *X86AsmParser::ParseIntelBracExpression(unsigned SegReg,
return X86Operand::CreateMem(Disp, Start, End, Size);
}
} else if (getLexer().is(AsmToken::Integer)) {
// Handle '[' number ']'
const MCExpr *Disp = MCConstantExpr::Create(0, getParser().getContext());
if (getParser().ParseExpression(Disp, End)) return 0;
if (getLexer().isNot(AsmToken::RBrac))
return ErrorOperand(Start, "Expected ']' token!");
int64_t Val = Parser.getTok().getIntVal();
Parser.Lex();
return X86Operand::CreateMem(Disp, Start, End, Size);
SMLoc Loc = Parser.getTok().getLoc();
if (getLexer().is(AsmToken::RBrac)) {
// Handle '[' number ']'
Parser.Lex();
return X86Operand::CreateMem(MCConstantExpr::Create(Val, getContext()),
Start, End, Size);
} else if (getLexer().is(AsmToken::Star)) {
// Handle '[' Scale*IndexReg ']'
Parser.Lex();
SMLoc IdxRegLoc = Parser.getTok().getLoc();
if (ParseRegister(IndexReg, IdxRegLoc, End))
return ErrorOperand(IdxRegLoc, "Expected register");
Scale = Val;
} else
return ErrorOperand(Loc, "Unepxeted token");
}
if (getLexer().is(AsmToken::Plus) || getLexer().is(AsmToken::Minus)) {

4
test/MC/X86/intel-syntax.s
View File

@ -56,5 +56,7 @@ _main:
// CHECK: fld %st(0)
fld ST(0)
// CHECK: movl %fs:(%rdi), %eax
mov EAX, DWORD PTR FS:[RDI]
mov EAX, DWORD PTR FS:[RDI]
// CHECK: leal (,%rdi,4), %r8d
lea R8D, DWORD PTR [4*RDI]
ret