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Minor cleanups.

Browse Source 
This hunk:
-    } else if (Src->getNumOperands() == 2 && Src->use_size() == 1) {
+    } else if (Src->getNumOperands() == 2) {

Allows GEP folding to be more aggressive, which reduces the number of instructions
and can dramatically speed up BasicAA in some cases.

llvm-svn: 6286
This commit is contained in:
Chris Lattner 2003-05-22 19:07:21 +00:00
parent 0b18a0d886
commit 91c5d68261
1 changed files with 5 additions and 8 deletions
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13
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -18,10 +18,7 @@
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/ConstantHandling.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
#include "llvm/iPHINode.h"
#include "llvm/iOperators.h"
#include "llvm/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Support/InstIterator.h"
@ -941,7 +938,7 @@ Instruction *InstCombiner::visitPHINode(PHINode &PN) {
Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// Is it 'getelementptr %P, uint 0' or 'getelementptr %P'
// Is it 'getelementptr %P, long 0' or 'getelementptr %P'
// If so, eliminate the noop.
if ((GEP.getNumOperands() == 2 &&
GEP.getOperand(1) == Constant::getNullValue(Type::LongTy)) ||
@ -956,8 +953,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
std::vector<Value *> Indices;
// Can we combine the two pointer arithmetics offsets?
if (Src->getNumOperands() == 2 && isa<Constant>(Src->getOperand(1)) &&
isa<Constant>(GEP.getOperand(1))) {
if (Src->getNumOperands() == 2 && isa<Constant>(Src->getOperand(1)) &&
isa<Constant>(GEP.getOperand(1))) {
// Replace: gep (gep %P, long C1), long C2, ...
// With: gep %P, long (C1+C2), ...
Value *Sum = *cast<Constant>(Src->getOperand(1)) +
@ -967,7 +964,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
GEP.setOperand(1, Sum);
AddUsesToWorkList(*Src); // Reduce use count of Src
return &GEP;
} else if (Src->getNumOperands() == 2 && Src->use_size() == 1) {
} else if (Src->getNumOperands() == 2) {
// Replace: gep (gep %P, long B), long A, ...
// With: T = long A+B; gep %P, T, ...
//