Changes in directory llvm/lib/CodeGen:
IfConversion.cpp updated: 1.24 -> 1.25
---
Log message:
If the predicated block requires an early exit, end the block there and add a
unconditional branch to false block. AnalyzeBranch() does not understand early
exits.
---
Diffs of the changes: (+3 -2)
IfConversion.cpp | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
Index: llvm/lib/CodeGen/IfConversion.cpp
diff -u llvm/lib/CodeGen/IfConversion.cpp:1.24
llvm/lib/CodeGen/IfConversion.cpp:1.25
--- llvm/lib/CodeGen/IfConversion.cpp:1.24 Mon Jun 4 19:07:37 2007
+++ llvm/lib/CodeGen/IfConversion.cpp Mon Jun 4 20:31:40 2007
@@ -527,7 +527,8 @@
PredicateBlock(TrueBBI, BBI.BrCond);
// If 'true' block has a 'false' successor, add an exit branch to it.
- if (TrueBBI.FalseBB) {
+ bool HasEarlyExit = TrueBBI.FalseBB != NULL;
+ if (HasEarlyExit) {
std::vector<MachineOperand> RevCond(TrueBBI.BrCond);
if (TII->ReverseBranchCondition(RevCond))
assert(false && "Unable to reverse branch condition!");
@@ -538,7 +539,7 @@
// predecessors. Otherwise, add a unconditional branch from 'true' to
'false'.
BBInfo &FalseBBI = BBAnalysis[BBI.FalseBB->getNumber()];
bool FalseBBDead = false;
- if (FalseBBI.BB->pred_size() == 2) {
+ if (!HasEarlyExit && FalseBBI.BB->pred_size() == 2) {
MergeBlocks(TrueBBI, FalseBBI);
FalseBBDead = true;
} else if (!isNextBlock(TrueBBI.BB, FalseBBI.BB))
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