Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.487 -> 1.488
---
Log message:
Implement Transforms/InstCombine/store.ll:test2.
---
Diffs of the changes: (+15 -1)
InstructionCombining.cpp | 16 +++++++++++++++-
1 files changed, 15 insertions(+), 1 deletion(-)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.487
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.488
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.487 Thu May 25
19:29:06 2006
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Fri May 26 14:19:20 2006
@@ -6833,8 +6833,22 @@
break;
}
+ // If this is a load, we have to stop. However, if the loaded value is
from
+ // the pointer we're loading and is producing the pointer we're storing,
+ // then *this* store is dead (X = load P; store X -> P).
+ if (LoadInst *LI = dyn_cast<LoadInst>(BBI)) {
+ if (LI == Val && LI->getOperand(0) == Ptr) {
+ EraseInstFromFunction(SI);
+ ++NumCombined;
+ return 0;
+ }
+ // Otherwise, this is a load from some other location. Stores before it
+ // may not be dead.
+ break;
+ }
+
// Don't skip over loads or things that can modify memory.
- if (BBI->mayWriteToMemory() || isa<LoadInst>(BBI))
+ if (BBI->mayWriteToMemory())
break;
}
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