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Add a target callback for FastISel.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55512 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-08-28 23:21:34 +00:00
parent 327ef031ed
commit 99b218218c
4 changed files with 48 additions and 4 deletions
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15
include/llvm/CodeGen/FastISel.h
View File

@ -52,10 +52,21 @@ public:
/// the generated MachineInstrs.
BasicBlock::iterator
SelectInstructions(BasicBlock::iterator Begin, BasicBlock::iterator End,
DenseMap<const Value*, unsigned> &ValueMap,
DenseMap<const BasicBlock*, MachineBasicBlock *> &MBBMap,
DenseMap<const Value *, unsigned> &ValueMap,
DenseMap<const BasicBlock *, MachineBasicBlock *> &MBBMap,
MachineBasicBlock *MBB);
/// TargetSelectInstruction - This method is called by target-independent
/// code when the normal FastISel process fails to select an instruction.
/// This gives targets a chance to emit code for anything that doesn't
/// fit into FastISel's framework. It returns true if it was successful.
///
virtual bool
TargetSelectInstruction(Instruction *I,
DenseMap<const Value *, unsigned> &ValueMap,
DenseMap<const BasicBlock *, MachineBasicBlock *> &MBBMap,
MachineBasicBlock *MBB) = 0;
virtual ~FastISel();
protected:

9
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -5757,10 +5757,15 @@ void SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, MachineFunction &MF) {
Begin = F->SelectInstructions(Begin, End, FuncInfo->ValueMap,
FuncInfo->MBBMap, BB);
// If the "fast" selector selected the entire block, we're done.
if (Begin == End)
// The "fast" selector selected the entire block, so we're done.
break;
// Next, try calling the target to attempt to handle the instruction.
if (F->TargetSelectInstruction(Begin, FuncInfo->ValueMap,
FuncInfo->MBBMap, BB))
continue;
// Handle certain instructions as single-LLVM-Instruction blocks.
if (isa<CallInst>(Begin) || isa<LoadInst>(Begin) ||
isa<StoreInst>(Begin)) {
@ -5783,7 +5788,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, MachineFunction &MF) {
// The "fast" selector couldn't handle something and bailed.
// For the purpose of debugging, just abort.
#ifndef NDEBUG
Begin->dump();
Begin->dump();
#endif
assert(0 && "FastISel didn't select the entire block");
}

20
lib/Target/X86/X86FastISel.cpp
View File

@ -19,3 +19,23 @@
#include "X86FastISel.h"
#include "X86TargetMachine.h"
#include "X86GenFastISel.inc"
namespace llvm {
namespace X86 {
bool
FastISel::TargetSelectInstruction(Instruction *I,
DenseMap<const Value *, unsigned> &ValueMap,
DenseMap<const BasicBlock *, MachineBasicBlock *> &MBBMap,
MachineBasicBlock *MBB) {
switch (I->getOpcode()) {
default: break;
}
return false;
}
}
}

8
utils/TableGen/FastISelEmitter.cpp
View File

@ -351,6 +351,14 @@ void FastISelMap::PrintClass(std::ostream &OS) {
}
OS << "\n";
OS << "bool TargetSelectInstruction(Instruction *I,\n";
OS << " "
"DenseMap<const Value *, unsigned> &ValueMap,\n";
OS << " "
"DenseMap<const BasicBlock *, MachineBasicBlock *> &MBBMap,\n";
OS << " "
"MachineBasicBlock *MBB);\n";
// Declare the Subtarget member, which is used for predicate checks.
OS << " const " << InstNS.substr(0, InstNS.size() - 2)
<< "Subtarget *Subtarget;\n";