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Factor out code that optimize loop terminating condition.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-05-09 01:08:24 +00:00
parent c63a62735b
commit 2d85052f2b
1 changed files with 9 additions and 0 deletions
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9
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -164,8 +164,11 @@ namespace {
ICmpInst *ChangeCompareStride(Loop *L, ICmpInst *Cond, ICmpInst *ChangeCompareStride(Loop *L, ICmpInst *Cond,
IVStrideUse* &CondUse, IVStrideUse* &CondUse,
const SCEVHandle* &CondStride); const SCEVHandle* &CondStride);
void OptimizeIndvars(Loop *L); void OptimizeIndvars(Loop *L);
void OptimizeLoopTermCond(Loop *L);
/// OptimizeShadowIV - If IV is used in a int-to-float cast /// OptimizeShadowIV - If IV is used in a int-to-float cast
/// inside the loop then try to eliminate the cast opeation. /// inside the loop then try to eliminate the cast opeation.
void OptimizeShadowIV(Loop *L); void OptimizeShadowIV(Loop *L);
@ -2378,6 +2381,12 @@ void LoopStrengthReduce::OptimizeIndvars(Loop *L) {
OptimizeShadowIV(L); OptimizeShadowIV(L);
OptimizeLoopTermCond(L);
}
/// OptimizeLoopTermCond - Change loop terminating condition to use the
/// postinc iv when possible.
void LoopStrengthReduce::OptimizeLoopTermCond(Loop *L) {
// Finally, get the terminating condition for the loop if possible. If we // Finally, get the terminating condition for the loop if possible. If we
// can, we want to change it to use a post-incremented version of its // can, we want to change it to use a post-incremented version of its
// induction variable, to allow coalescing the live ranges for the IV into // induction variable, to allow coalescing the live ranges for the IV into