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ARM: Use MCTargetAsmParser::validateTargetOperandClass(). 

Use the validateTargetOperandClass() hook to match literal '#0' operands in
InstAlias definitions. Previously this required per-instruction C++ munging of the
operand list, but not is handled as a natural part of the matcher. Much better.

No additional tests are required, as the pre-existing tests for these instructions
exercise the new behaviour as being functionally equivalent to the old.

llvm-svn: 174488
This commit is contained in:
Jim Grosbach 2013-02-06 06:00:11 +00:00
parent 86c652a6b2
commit 231e7aa460
1 changed files with 19 additions and 47 deletions
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66
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -269,6 +269,7 @@ public:
SmallVectorImpl<MCParsedAsmOperand*> &Operands);
bool ParseDirective(AsmToken DirectiveID);
unsigned validateTargetOperandClass(MCParsedAsmOperand *Op, unsigned Kind);
unsigned checkTargetMatchPredicate(MCInst &Inst);
bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
@ -5158,53 +5159,6 @@ bool ARMAsmParser::ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
delete Op;
}
// The vector-compare-to-zero instructions have a literal token "#0" at
// the end that comes to here as an immediate operand. Convert it to a
// token to play nicely with the matcher.
if ((Mnemonic == "vceq" || Mnemonic == "vcge" || Mnemonic == "vcgt" ||
Mnemonic == "vcle" || Mnemonic == "vclt") && Operands.size() == 6 &&
static_cast<ARMOperand*>(Operands[5])->isImm()) {
ARMOperand *Op = static_cast<ARMOperand*>(Operands[5]);
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
if (CE && CE->getValue() == 0) {
Operands.erase(Operands.begin() + 5);
Operands.push_back(ARMOperand::CreateToken("#0", Op->getStartLoc()));
delete Op;
}
}
// VCMP{E} does the same thing, but with a different operand count.
if ((Mnemonic == "vcmp" || Mnemonic == "vcmpe") && Operands.size() == 5 &&
static_cast<ARMOperand*>(Operands[4])->isImm()) {
ARMOperand *Op = static_cast<ARMOperand*>(Operands[4]);
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
if (CE && CE->getValue() == 0) {
Operands.erase(Operands.begin() + 4);
Operands.push_back(ARMOperand::CreateToken("#0", Op->getStartLoc()));
delete Op;
}
}
// Similarly, the Thumb1 "RSB" instruction has a literal "#0" on the
// end. Convert it to a token here. Take care not to convert those
// that should hit the Thumb2 encoding.
if (Mnemonic == "rsb" && isThumb() && Operands.size() == 6 &&
static_cast<ARMOperand*>(Operands[3])->isReg() &&
static_cast<ARMOperand*>(Operands[4])->isReg() &&
static_cast<ARMOperand*>(Operands[5])->isImm()) {
ARMOperand *Op = static_cast<ARMOperand*>(Operands[5]);
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
if (CE && CE->getValue() == 0 &&
(isThumbOne() ||
// The cc_out operand matches the IT block.
((inITBlock() != CarrySetting) &&
// Neither register operand is a high register.
(isARMLowRegister(static_cast<ARMOperand*>(Operands[3])->getReg()) &&
isARMLowRegister(static_cast<ARMOperand*>(Operands[4])->getReg()))))){
Operands.erase(Operands.begin() + 5);
Operands.push_back(ARMOperand::CreateToken("#0", Op->getStartLoc()));
delete Op;
}
}
// Adjust operands of ldrexd/strexd to MCK_GPRPair.
// ldrexd/strexd require even/odd GPR pair. To enforce this constraint,
// a single GPRPair reg operand is used in the .td file to replace the two
@ -7857,3 +7811,21 @@ extern "C" void LLVMInitializeARMAsmParser() {
#define GET_SUBTARGET_FEATURE_NAME
#define GET_MATCHER_IMPLEMENTATION
#include "ARMGenAsmMatcher.inc"
// Define this matcher function after the auto-generated include so we
// have the match class enum definitions.
unsigned ARMAsmParser::validateTargetOperandClass(MCParsedAsmOperand *AsmOp,
unsigned Kind) {
ARMOperand *Op = static_cast<ARMOperand*>(AsmOp);
// If the kind is a token for a literal immediate, check if our asm
// operand matches. This is for InstAliases which have a fixed-value
// immediate in the syntax.
if (Kind == MCK__35_0 && Op->isImm()) {
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
if (!CE)
return Match_InvalidOperand;
if (CE->getValue() == 0)
return Match_Success;
}
return Match_InvalidOperand;
}