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Avoid if-converting simple block that ends with unconditional branch or fallthrough unless it branches / falls to the 'false' block. Not profitable, may end up increasing code size.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-06-19 21:45:13 +00:00
parent 277f0741c5
commit 9ffd340daf
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/IfConversion.cpp
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@@ -399,6 +399,9 @@ bool IfConverter::ValidSimple(BBInfo &TrueBBI, unsigned &Dups) const {
if (TrueBBI.IsBeingAnalyzed || TrueBBI.IsDone) if (TrueBBI.IsBeingAnalyzed || TrueBBI.IsDone)
return false; return false;
if (TrueBBI.IsBrAnalyzable)
return false;
if (TrueBBI.BB->pred_size() > 1) { if (TrueBBI.BB->pred_size() > 1) {
if (TrueBBI.CannotBeCopied || if (TrueBBI.CannotBeCopied ||
TrueBBI.NonPredSize > TLI->getIfCvtDupBlockSizeLimit()) TrueBBI.NonPredSize > TLI->getIfCvtDupBlockSizeLimit())
@@ -406,7 +409,7 @@ bool IfConverter::ValidSimple(BBInfo &TrueBBI, unsigned &Dups) const {
Dups = TrueBBI.NonPredSize; Dups = TrueBBI.NonPredSize;
} }
return !blockAlwaysFallThrough(TrueBBI) && TrueBBI.BrCond.size() == 0; return true;
} }
/// ValidTriangle - Returns true if the 'true' and 'false' blocks (along /// ValidTriangle - Returns true if the 'true' and 'false' blocks (along