[llvm-commits] [llvm] r107965 - /llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp
Gabor Greif
ggreif at gmail.com
Fri Jul 9 07:02:13 PDT 2010
Author: ggreif
Date: Fri Jul 9 09:02:13 2010
New Revision: 107965
URL: http://llvm.org/viewvc/llvm-project?rev=107965&view=rev
Log:
cache operator*'s result (in multiple functions)
Modified:
llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp
Modified: llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp?rev=107965&r1=107964&r2=107965&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp (original)
+++ llvm/trunk/lib/Transforms/Utils/LoopSimplify.cpp Fri Jul 9 09:02:13 2010
@@ -142,9 +142,11 @@
if (*BB == L->getHeader()) continue;
SmallPtrSet<BasicBlock *, 4> BadPreds;
- for (pred_iterator PI = pred_begin(*BB), PE = pred_end(*BB); PI != PE; ++PI)
- if (!L->contains(*PI))
- BadPreds.insert(*PI);
+ for (pred_iterator PI = pred_begin(*BB), PE = pred_end(*BB); PI != PE; ++PI){
+ BasicBlock *P = *PI;
+ if (!L->contains(P))
+ BadPreds.insert(P);
+ }
// Delete each unique out-of-loop (and thus dead) predecessor.
for (SmallPtrSet<BasicBlock *, 4>::iterator I = BadPreds.begin(),
@@ -353,16 +355,18 @@
// Compute the set of predecessors of the loop that are not in the loop.
SmallVector<BasicBlock*, 8> OutsideBlocks;
for (pred_iterator PI = pred_begin(Header), PE = pred_end(Header);
- PI != PE; ++PI)
- if (!L->contains(*PI)) { // Coming in from outside the loop?
+ PI != PE; ++PI) {
+ BasicBlock *P = *PI;
+ if (!L->contains(P)) { // Coming in from outside the loop?
// If the loop is branched to from an indirect branch, we won't
// be able to fully transform the loop, because it prohibits
// edge splitting.
- if (isa<IndirectBrInst>((*PI)->getTerminator())) return 0;
+ if (isa<IndirectBrInst>(P->getTerminator())) return 0;
// Keep track of it.
- OutsideBlocks.push_back(*PI);
+ OutsideBlocks.push_back(P);
}
+ }
// Split out the loop pre-header.
BasicBlock *NewBB =
@@ -385,13 +389,15 @@
/// outside of the loop.
BasicBlock *LoopSimplify::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
SmallVector<BasicBlock*, 8> LoopBlocks;
- for (pred_iterator I = pred_begin(Exit), E = pred_end(Exit); I != E; ++I)
- if (L->contains(*I)) {
+ for (pred_iterator I = pred_begin(Exit), E = pred_end(Exit); I != E; ++I) {
+ BasicBlock *P = *I;
+ if (L->contains(P)) {
// Don't do this if the loop is exited via an indirect branch.
- if (isa<IndirectBrInst>((*I)->getTerminator())) return 0;
+ if (isa<IndirectBrInst>(P->getTerminator())) return 0;
- LoopBlocks.push_back(*I);
+ LoopBlocks.push_back(P);
}
+ }
assert(!LoopBlocks.empty() && "No edges coming in from outside the loop?");
BasicBlock *NewBB = SplitBlockPredecessors(Exit, &LoopBlocks[0],
@@ -559,10 +565,11 @@
// Determine which blocks should stay in L and which should be moved out to
// the Outer loop now.
std::set<BasicBlock*> BlocksInL;
- for (pred_iterator PI = pred_begin(Header), E = pred_end(Header); PI!=E; ++PI)
- if (DT->dominates(Header, *PI))
- AddBlockAndPredsToSet(*PI, Header, BlocksInL);
-
+ for (pred_iterator PI=pred_begin(Header), E = pred_end(Header); PI!=E; ++PI) {
+ BasicBlock *P = *PI;
+ if (DT->dominates(Header, P))
+ AddBlockAndPredsToSet(P, Header, BlocksInL);
+ }
// Scan all of the loop children of L, moving them to OuterLoop if they are
// not part of the inner loop.
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