Changes in directory llvm/lib/CodeGen:
IfConversion.cpp updated: 1.26 -> 1.27
---
Log message:
Do not ifcvt if either true / false path is a backedge. Not profitable in
almost all cases.
---
Diffs of the changes: (+3 -0)
IfConversion.cpp | 3 +++
1 files changed, 3 insertions(+)
Index: llvm/lib/CodeGen/IfConversion.cpp
diff -u llvm/lib/CodeGen/IfConversion.cpp:1.26
llvm/lib/CodeGen/IfConversion.cpp:1.27
--- llvm/lib/CodeGen/IfConversion.cpp:1.26 Tue Jun 5 02:05:25 2007
+++ llvm/lib/CodeGen/IfConversion.cpp Tue Jun 5 15:38:42 2007
@@ -237,6 +237,9 @@
!TII->AnalyzeBranch(*BB, BBI.TrueBB, BBI.FalseBB, BBI.BrCond);
if (!BBI.IsAnalyzable || BBI.BrCond.size() == 0)
return;
+ // Do not ifcvt if either path is a back edge to the entry block.
+ if (BBI.TrueBB == BB || BBI.FalseBB == BB)
+ return;
StructuralAnalysis(BBI.TrueBB);
BBInfo &TrueBBI = BBAnalysis[BBI.TrueBB->getNumber()];
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