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Disable tail duplication of call instructions. The cost

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metric is way off for these in general, and this works around
buggy code like that in PR1764.  we'll see if there is a big
performance impact of this.  If so, I'll revert it tomorrow.

llvm-svn: 43668
This commit is contained in:
Chris Lattner 2007-11-04 06:37:55 +00:00
parent c289d4b13d
commit 493f83eeb1
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/TailDuplication.cpp
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@ -115,6 +115,11 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) {
for (unsigned Size = 0; I != Dest->end(); ++I) {
if (Size == Threshold) return false; // The block is too large.
// Don't tail duplicate call instructions. They are very large compared to
// other instructions.
if (isa<CallInst>(I) || isa<InvokeInst>(I)) return false;
// Only count instructions that are not debugger intrinsics.
if (!isa<DbgInfoIntrinsic>(I)) ++Size;
}