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If a condition is not inside a loop then the condition is suitable

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to loop unswitch candidate for the loop.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37770 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2007-06-28 00:44:10 +00:00
parent a20f35d2e7
commit 558f1b8439
1 changed files with 7 additions and 0 deletions
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7
lib/Transforms/Scalar/LoopUnswitch.cpp
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@@ -128,6 +128,13 @@ LoopPass *llvm::createLoopUnswitchPass(bool Os) {
static Value *FindLIVLoopCondition(Value *Cond, Loop *L, bool &Changed) {
// Constants should be folded, not unswitched on!
if (isa<Constant>(Cond)) return false;
// If cond is not in loop then it is not suitable.
if (Instruction *I = dyn_cast<Instruction>(Cond))
if (!L->contains(I->getParent()))
return 0;
if (isa<Argument>(Cond))
return 0;
// TODO: Handle: br (VARIANT|INVARIANT).
// TODO: Hoist simple expressions out of loops.