6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-09-24 23:28:41 +00:00
Code Issues Projects Releases Wiki Activity

Rename ScalarEvolution's getIterationCount to getBackedgeTakenCount,

Browse Source 
to more accurately describe what it does. Expand its doxygen comment
to describe what the backedge-taken count is and how it differs
from the actual iteration count of the loop. Adjust names and
comments in associated code accordingly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65382 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-02-24 18:55:53 +00:00
parent 57f0db833d
commit 46bdfb0e6b
21 changed files with 177 additions and 145 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@@ -2351,13 +2351,13 @@ ICmpInst *LoopStrengthReduce::OptimizeSMax(Loop *L, ICmpInst *Cond,
SelectInst *Sel = dyn_cast<SelectInst>(Cond->getOperand(1));
if (!Sel || !Sel->hasOneUse()) return Cond;
SCEVHandle IterationCount = SE->getIterationCount(L);
if (isa<SCEVCouldNotCompute>(IterationCount))
SCEVHandle BackedgeTakenCount = SE->getBackedgeTakenCount(L);
if (isa<SCEVCouldNotCompute>(BackedgeTakenCount))
return Cond;
SCEVHandle One = SE->getIntegerSCEV(1, IterationCount->getType());
SCEVHandle One = SE->getIntegerSCEV(1, BackedgeTakenCount->getType());
// Adjust for an annoying getIterationCount quirk.
IterationCount = SE->getAddExpr(IterationCount, One);
// Add one to the backedge-taken count to get the trip count.
SCEVHandle IterationCount = SE->getAddExpr(BackedgeTakenCount, One);
// Check for a max calculation that matches the pattern.
SCEVSMaxExpr *SMax = dyn_cast<SCEVSMaxExpr>(IterationCount);
@@ -2412,8 +2412,8 @@ ICmpInst *LoopStrengthReduce::OptimizeSMax(Loop *L, ICmpInst *Cond,
/// inside the loop then try to eliminate the cast opeation.
void LoopStrengthReduce::OptimizeShadowIV(Loop *L) {
SCEVHandle IterationCount = SE->getIterationCount(L);
if (isa<SCEVCouldNotCompute>(IterationCount))
SCEVHandle BackedgeTakenCount = SE->getBackedgeTakenCount(L);
if (isa<SCEVCouldNotCompute>(BackedgeTakenCount))
return;
for (unsigned Stride = 0, e = StrideOrder.size(); Stride != e;