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remove TargetAsmInfo::ExpandInlineAsm

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llvm-svn: 76445
This commit is contained in:
Chris Lattner 2009-07-20 17:59:32 +00:00
parent 31022c9412
commit 1f82d9a94c
3 changed files with 2 additions and 113 deletions
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9
include/llvm/Target/TargetAsmInfo.h
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@ -562,15 +562,6 @@ namespace llvm {
/// length.
virtual unsigned getInlineAsmLength(const char *Str) const;
/// ExpandInlineAsm - This hook allows the target to expand an inline asm
/// call to be explicit llvm code if it wants to. This is useful for
/// turning simple inline asms into LLVM intrinsics, which gives the
/// compiler more information about the behavior of the code.
// FIXME: Move this to TargetLowering.
virtual bool ExpandInlineAsm(CallInst *CI) const {
return false;
}
/// emitUsedDirectiveFor - This hook allows targets to selectively decide
/// not to emit the UsedDirective for some symbols in llvm.used.
// FIXME: REMOVE this (rdar://7071300)

94
lib/Target/X86/X86TargetAsmInfo.cpp
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@ -333,99 +333,5 @@ X86WinTargetAsmInfo::X86WinTargetAsmInfo(const X86TargetMachine &TM):
SectionEndDirectiveSuffix = "\tends\n";
}
template <class BaseTAI>
bool X86TargetAsmInfo<BaseTAI>::LowerToBSwap(CallInst *CI) const {
// FIXME: this should verify that we are targetting a 486 or better. If not,
// we will turn this bswap into something that will be lowered to logical ops
// instead of emitting the bswap asm. For now, we don't support 486 or lower
// so don't worry about this.
// Verify this is a simple bswap.
if (CI->getNumOperands() != 2 ||
CI->getType() != CI->getOperand(1)->getType() ||
!CI->getType()->isInteger())
return false;
const IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
if (!Ty || Ty->getBitWidth() % 16 != 0)
return false;
// Okay, we can do this xform, do so now.
const Type *Tys[] = { Ty };
Module *M = CI->getParent()->getParent()->getParent();
Constant *Int = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 1);
Value *Op = CI->getOperand(1);
Op = CallInst::Create(Int, Op, CI->getName(), CI);
CI->replaceAllUsesWith(Op);
CI->eraseFromParent();
return true;
}
template <class BaseTAI>
bool X86TargetAsmInfo<BaseTAI>::ExpandInlineAsm(CallInst *CI) const {
InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
std::vector<InlineAsm::ConstraintInfo> Constraints = IA->ParseConstraints();
std::string AsmStr = IA->getAsmString();
// TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
std::vector<std::string> AsmPieces;
SplitString(AsmStr, AsmPieces, "\n"); // ; as separator?
switch (AsmPieces.size()) {
default: return false;
case 1:
AsmStr = AsmPieces[0];
AsmPieces.clear();
SplitString(AsmStr, AsmPieces, " \t"); // Split with whitespace.
// bswap $0
if (AsmPieces.size() == 2 &&
(AsmPieces[0] == "bswap" ||
AsmPieces[0] == "bswapq" ||
AsmPieces[0] == "bswapl") &&
(AsmPieces[1] == "$0" ||
AsmPieces[1] == "${0:q}")) {
// No need to check constraints, nothing other than the equivalent of
// "=r,0" would be valid here.
return LowerToBSwap(CI);
}
// rorw $$8, ${0:w} --> llvm.bswap.i16
if (CI->getType() == Type::Int16Ty &&
AsmPieces.size() == 3 &&
AsmPieces[0] == "rorw" &&
AsmPieces[1] == "$$8," &&
AsmPieces[2] == "${0:w}" &&
IA->getConstraintString() == "=r,0,~{dirflag},~{fpsr},~{flags},~{cc}") {
return LowerToBSwap(CI);
}
break;
case 3:
if (CI->getType() == Type::Int64Ty && Constraints.size() >= 2 &&
Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
// bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
std::vector<std::string> Words;
SplitString(AsmPieces[0], Words, " \t");
if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%eax") {
Words.clear();
SplitString(AsmPieces[1], Words, " \t");
if (Words.size() == 2 && Words[0] == "bswap" && Words[1] == "%edx") {
Words.clear();
SplitString(AsmPieces[2], Words, " \t,");
if (Words.size() == 3 && Words[0] == "xchgl" && Words[1] == "%eax" &&
Words[2] == "%edx") {
return LowerToBSwap(CI);
}
}
}
}
break;
}
return false;
}
// Instantiate default implementation.
TEMPLATE_INSTANTIATION(class X86TargetAsmInfo<TargetAsmInfo>);

12
lib/Target/X86/X86TargetAsmInfo.h
View File

@ -26,18 +26,10 @@ namespace llvm {
template <class BaseTAI>
struct X86TargetAsmInfo : public BaseTAI {
explicit X86TargetAsmInfo(const X86TargetMachine &TM):
BaseTAI(TM) {
const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
explicit X86TargetAsmInfo(const X86TargetMachine &TM) : BaseTAI(TM) {
BaseTAI::AsmTransCBE = x86_asm_table;
BaseTAI::AssemblerDialect = Subtarget->getAsmFlavor();
BaseTAI::AssemblerDialect =TM.getSubtarget<X86Subtarget>().getAsmFlavor();
}
virtual bool ExpandInlineAsm(CallInst *CI) const;
private:
bool LowerToBSwap(CallInst *CI) const;
};
typedef X86TargetAsmInfo<TargetAsmInfo> X86GenericTargetAsmInfo;