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add a hook to allow targets to hack on inline asms to lower them to llvm

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when they want to.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31997 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-11-29 01:12:32 +00:00
parent de33124aa3
commit 3f7927c84c
2 changed files with 22 additions and 4 deletions
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12
include/llvm/Target/TargetAsmInfo.h
View File

@ -20,9 +20,8 @@
#include "llvm/Support/DataTypes.h"
namespace llvm {
// Forward declaration.
class TargetMachine;
class CallInst;
/// TargetAsmInfo - This class is intended to be used as a base class for asm
/// properties and features specific to the target.
@ -286,8 +285,15 @@ namespace llvm {
/// Measure the specified inline asm to determine an approximation of its
/// length.
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.
virtual bool ExpandInlineAsm(CallInst *CI) const {
return false;
}
//
// Accessors.
//
const char *getTextSection() const {

14
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -33,6 +33,7 @@
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
@ -3780,7 +3781,17 @@ bool SelectionDAGISel::runOnFunction(Function &Fn) {
for (BasicBlock::iterator BBI = BB->begin(), E = BB->end(); BBI != E; ) {
Instruction *I = BBI++;
if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(I)) {
if (CallInst *CI = dyn_cast<CallInst>(I)) {
// If we found an inline asm expession, and if the target knows how to
// lower it to normal LLVM code, do so now.
if (isa<InlineAsm>(CI->getCalledValue()))
if (const TargetAsmInfo *TAI =
TLI.getTargetMachine().getTargetAsmInfo()) {
if (TAI->ExpandInlineAsm(CI))
BBI = BB->begin();
}
} else if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(I)) {
MadeChange |= OptimizeGEPExpression(GEPI, TLI.getTargetData());
} else if (CastInst *CI = dyn_cast<CastInst>(I)) {
// If the source of the cast is a constant, then this should have
@ -4004,6 +4015,7 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
unsigned Reg;
Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB);
if (Constant *C = dyn_cast<Constant>(PHIOp)) {
unsigned &RegOut = ConstantsOut[C];
if (RegOut == 0) {