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Re-apply bottom-up fast-isel, with fixes. Be very careful to avoid emitting

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a DBG_VALUE after a terminator, or emitting any instructions before an EH_LABEL.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107943 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-07-09 00:39:23 +00:00
parent 1cd050931f
commit bf87e24917
22 changed files with 645 additions and 365 deletions
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35
include/llvm/CodeGen/FastISel.h
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@@ -19,6 +19,7 @@
#include "llvm/ADT/SmallSet.h"
#endif
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
namespace llvm {
@@ -44,7 +45,6 @@ class TargetRegisterInfo;
/// lowering, but runs quickly.
class FastISel {
protected:
MachineBasicBlock *MBB;
DenseMap<const Value *, unsigned> LocalValueMap;
FunctionLoweringInfo &FuncInfo;
MachineRegisterInfo &MRI;
@@ -56,23 +56,21 @@ protected:
const TargetInstrInfo &TII;
const TargetLowering &TLI;
const TargetRegisterInfo &TRI;
bool IsBottomUp;
MachineInstr *LastLocalValue;
public:
/// getLastLocalValue - Return the position of the last instruction
/// emitted for materializing constants for use in the current block.
MachineInstr *getLastLocalValue() { return LastLocalValue; }
/// setLastLocalValue - Update the position of the last instruction
/// emitted for materializing constants for use in the current block.
void setLastLocalValue(MachineInstr *I) { LastLocalValue = I; }
/// startNewBlock - Set the current block to which generated machine
/// instructions will be appended, and clear the local CSE map.
///
void startNewBlock(MachineBasicBlock *mbb) {
setCurrentBlock(mbb);
LocalValueMap.clear();
}
/// setCurrentBlock - Set the current block to which generated machine
/// instructions will be appended.
///
void setCurrentBlock(MachineBasicBlock *mbb) {
MBB = mbb;
}
void startNewBlock();
/// getCurDebugLoc() - Return current debug location information.
DebugLoc getCurDebugLoc() const { return DL; }
@@ -104,6 +102,17 @@ public:
/// index value.
std::pair<unsigned, bool> getRegForGEPIndex(const Value *V);
/// recomputeInsertPt - Reset InsertPt to prepare for insterting instructions
/// into the current block.
void recomputeInsertPt();
/// enterLocalValueArea - Prepare InsertPt to begin inserting instructions
/// into the local value area and return the old insert position.
MachineBasicBlock::iterator enterLocalValueArea();
/// leaveLocalValueArea - Reset InsertPt to the given old insert position
void leaveLocalValueArea(MachineBasicBlock::iterator OldInsertPt);
virtual ~FastISel();
protected: