6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-25 13:24:46 +00:00
Code Issues Projects Releases Wiki Activity

LSR must sometimes sign-extend before generating double constants.

Browse Source 
rdar://9786536


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135650 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-07-21 01:05:01 +00:00
parent fb4eb165d6
commit c2c988e5e0
2 changed files with 30 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@@ -1427,6 +1427,7 @@ void LSRInstance::OptimizeShadowIV() {
++UI;
Instruction *ShadowUse = CandidateUI->getUser();
Type *DestTy = NULL;
bool IsSigned = false;
/* If shadow use is a int->float cast then insert a second IV
to eliminate this cast.
@@ -1440,10 +1441,14 @@ void LSRInstance::OptimizeShadowIV() {
for (unsigned i = 0; i < n; ++i, ++d)
foo(d);
*/
if (UIToFPInst *UCast = dyn_cast<UIToFPInst>(CandidateUI->getUser()))
if (UIToFPInst *UCast = dyn_cast<UIToFPInst>(CandidateUI->getUser())) {
IsSigned = false;
DestTy = UCast->getDestTy();
else if (SIToFPInst *SCast = dyn_cast<SIToFPInst>(CandidateUI->getUser()))
}
else if (SIToFPInst *SCast = dyn_cast<SIToFPInst>(CandidateUI->getUser())) {
IsSigned = true;
DestTy = SCast->getDestTy();
}
if (!DestTy) continue;
if (TLI) {
@@ -1474,7 +1479,9 @@ void LSRInstance::OptimizeShadowIV() {
ConstantInt *Init = dyn_cast<ConstantInt>(PH->getIncomingValue(Entry));
if (!Init) continue;
Constant *NewInit = ConstantFP::get(DestTy, Init->getZExtValue());
Constant *NewInit = ConstantFP::get(DestTy, IsSigned ?
Init->getSExtValue() :
Init->getZExtValue());
BinaryOperator *Incr =
dyn_cast<BinaryOperator>(PH->getIncomingValue(Latch));