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Do not count DbgInfoIntrinsic while estimating loop header size.

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llvm-svn: 66245
This commit is contained in:
Devang Patel 2009-03-06 03:51:30 +00:00
parent 9abfbc2e14
commit ff51ec061c
1 changed files with 14 additions and 2 deletions
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16
lib/Transforms/Scalar/LoopRotation.cpp
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@ -14,7 +14,7 @@
#define DEBUG_TYPE "loop-rotate"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/Dominators.h"
@ -161,7 +161,19 @@ bool LoopRotate::rotateLoop(Loop *Lp, LPPassManager &LPM) {
// Check size of original header and reject
// loop if it is very big.
if (OrigHeader->size() > MAX_HEADER_SIZE)
unsigned Size = 0;
// FIXME: Use common api to estimate size.
for (BasicBlock::const_iterator OI = OrigHeader->begin(),
OE = OrigHeader->end(); OI != OE; ++OI) {
if (isa<PHINode>(OI))
continue; // PHI nodes don't count.
if (isa<DbgInfoIntrinsic>(OI))
continue; // Debug intrinsics don't count as size.
Size++;
}
if (Size > MAX_HEADER_SIZE)
return false;
// Now, this loop is suitable for rotation.