Don't unroll loops containing function calls.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95454 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopUnrollPass.cpp b/lib/Transforms/Scalar/LoopUnrollPass.cpp
index ee8cb4f..a355ec3 100644
--- a/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -76,11 +76,12 @@
Pass *llvm::createLoopUnrollPass() { return new LoopUnroll(); }
/// ApproximateLoopSize - Approximate the size of the loop.
-static unsigned ApproximateLoopSize(const Loop *L) {
+static unsigned ApproximateLoopSize(const Loop *L, unsigned &NumCalls) {
CodeMetrics Metrics;
for (Loop::block_iterator I = L->block_begin(), E = L->block_end();
I != E; ++I)
Metrics.analyzeBasicBlock(*I);
+ NumCalls = Metrics.NumCalls;
return Metrics.NumInsts;
}
@@ -110,8 +111,13 @@
// Enforce the threshold.
if (UnrollThreshold != NoThreshold) {
- unsigned LoopSize = ApproximateLoopSize(L);
+ unsigned NumCalls;
+ unsigned LoopSize = ApproximateLoopSize(L, NumCalls);
DEBUG(dbgs() << " Loop Size = " << LoopSize << "\n");
+ if (NumCalls != 0) {
+ DEBUG(dbgs() << " Not unrolling loop with function calls.\n");
+ return false;
+ }
uint64_t Size = (uint64_t)LoopSize*Count;
if (TripCount != 1 && Size > UnrollThreshold) {
DEBUG(dbgs() << " Too large to fully unroll with count: " << Count