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Fix a case where LSR is sensitive to debug info.

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llvm-svn: 97830
This commit is contained in:
Dale Johannesen 2010-03-05 21:12:40 +00:00
parent 3346ea1d4e
commit 5c83d9b9b8
1 changed files with 9 additions and 0 deletions
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9
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -15,6 +15,7 @@
#include "llvm/Analysis/ScalarEvolutionExpander.h" #include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/Analysis/LoopInfo.h" #include "llvm/Analysis/LoopInfo.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/LLVMContext.h" #include "llvm/LLVMContext.h"
#include "llvm/Target/TargetData.h" #include "llvm/Target/TargetData.h"
#include "llvm/ADT/STLExtras.h" #include "llvm/ADT/STLExtras.h"
@ -137,6 +138,10 @@ Value *SCEVExpander::InsertBinop(Instruction::BinaryOps Opcode,
if (IP != BlockBegin) { if (IP != BlockBegin) {
--IP; --IP;
for (; ScanLimit; --IP, --ScanLimit) { for (; ScanLimit; --IP, --ScanLimit) {
// Don't count dbg.value against the ScanLimit, to avoid perturbing the
// generated code.
if (isa<DbgInfoIntrinsic>(IP))
ScanLimit++;
if (IP->getOpcode() == (unsigned)Opcode && IP->getOperand(0) == LHS && if (IP->getOpcode() == (unsigned)Opcode && IP->getOperand(0) == LHS &&
IP->getOperand(1) == RHS) IP->getOperand(1) == RHS)
return IP; return IP;
@ -505,6 +510,10 @@ Value *SCEVExpander::expandAddToGEP(const SCEV *const *op_begin,
if (IP != BlockBegin) { if (IP != BlockBegin) {
--IP; --IP;
for (; ScanLimit; --IP, --ScanLimit) { for (; ScanLimit; --IP, --ScanLimit) {
// Don't count dbg.value against the ScanLimit, to avoid perturbing the
// generated code.
if (isa<DbgInfoIntrinsic>(IP))
ScanLimit++;
if (IP->getOpcode() == Instruction::GetElementPtr && if (IP->getOpcode() == Instruction::GetElementPtr &&
IP->getOperand(0) == V && IP->getOperand(1) == Idx) IP->getOperand(0) == V && IP->getOperand(1) == Idx)
return IP; return IP;