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MC/ARM: Add basic support for handling predication by parsing it out of the mnemonic into a separate operand form. 

llvm-svn: 110794
This commit is contained in:
Daniel Dunbar 2010-08-11 06:37:20 +00:00
parent 75d26be81a
commit 188b47b214
2 changed files with 52 additions and 1 deletions
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45
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -22,6 +22,7 @@
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Twine.h"
using namespace llvm;
@ -221,8 +222,10 @@ public:
}
void addCondCodeOperands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
assert(N == 2 && "Invalid number of operands!");
Inst.addOperand(MCOperand::CreateImm(unsigned(getCondCode())));
// FIXME: What belongs here?
Inst.addOperand(MCOperand::CreateReg(0));
}
void addRegOperands(MCInst &Inst, unsigned N) const {
@ -237,6 +240,15 @@ public:
virtual void dump(raw_ostream &OS) const;
static void CreateCondCode(OwningPtr<ARMOperand> &Op, ARMCC::CondCodes CC,
SMLoc S) {
Op.reset(new ARMOperand);
Op->Kind = CondCode;
Op->CC.Val = CC;
Op->StartLoc = S;
Op->EndLoc = S;
}
static void CreateToken(OwningPtr<ARMOperand> &Op, StringRef Str,
SMLoc S) {
Op.reset(new ARMOperand);
@ -656,9 +668,40 @@ bool ARMAsmParser::ParseInstruction(StringRef Name, SMLoc NameLoc,
size_t Start = 0, Next = Name.find('.');
StringRef Head = Name.slice(Start, Next);
// Determine the predicate, if any.
//
// FIXME: We need a way to check whether a prefix supports predication,
// otherwise we will end up with an ambiguity for instructions that happen to
// end with a predicate name.
unsigned CC = StringSwitch<unsigned>(Head.substr(Head.size()-2))
.Case("eq", ARMCC::EQ)
.Case("ne", ARMCC::NE)
.Case("hs", ARMCC::HS)
.Case("lo", ARMCC::LO)
.Case("mi", ARMCC::MI)
.Case("pl", ARMCC::PL)
.Case("vs", ARMCC::VS)
.Case("vc", ARMCC::VC)
.Case("hi", ARMCC::HI)
.Case("ls", ARMCC::LS)
.Case("ge", ARMCC::GE)
.Case("lt", ARMCC::LT)
.Case("gt", ARMCC::GT)
.Case("le", ARMCC::LE)
.Case("al", ARMCC::AL)
.Default(~0U);
if (CC != ~0U) {
Head = Head.slice(0, Head.size() - 2);
} else
CC = ARMCC::AL;
ARMOperand::CreateToken(Op, Head, NameLoc);
Operands.push_back(Op.take());
ARMOperand::CreateCondCode(Op, ARMCC::CondCodes(CC), NameLoc);
Operands.push_back(Op.take());
// Add the remaining tokens in the mnemonic.
while (Next != StringRef::npos) {
Start = Next;
Next = Name.find('.', Start + 1);

8
llvm/test/MC/AsmParser/ARM/arm_instructions.s Normal file
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@ -0,0 +1,8 @@
@ RUN: llvm-mc -triple arm-unknown-unknown %s | FileCheck %s
@ CHECK: nop
nop
@ CHECK: nopeq
nopeq