Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.712 -> 1.713
---
Log message:
Use APInt operators to calculate the carry bits, remove this loop.
---
Diffs of the changes: (+2 -16)
InstructionCombining.cpp | 18 ++----------------
1 files changed, 2 insertions(+), 16 deletions(-)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.712
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.713
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.712 Fri Mar 30
12:20:39 2007
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Fri Mar 30 21:38:39 2007
@@ -1243,22 +1243,8 @@
// To compute this, we first compute the potential carry bits. These are
// the bits which may be modified. I'm not aware of a better way to do
// this scan.
- APInt RHSVal(RHS->getValue());
-
- bool CarryIn = false;
- APInt CarryBits(BitWidth, 0);
- const uint64_t *LHSKnownZeroRawVal = LHSKnownZero.getRawData(),
- *RHSRawVal = RHSVal.getRawData();
- for (uint32_t i = 0; i != RHSVal.getNumWords(); ++i) {
- uint64_t AddVal = ~LHSKnownZeroRawVal[i] + RHSRawVal[i],
- XorVal = ~LHSKnownZeroRawVal[i] ^ RHSRawVal[i];
- uint64_t WordCarryBits = AddVal ^ XorVal + CarryIn;
- if (AddVal < RHSRawVal[i])
- CarryIn = true;
- else
- CarryIn = false;
- CarryBits.setWordToValue(i, WordCarryBits);
- }
+ const APInt& RHSVal = RHS->getValue();
+ APInt CarryBits((~LHSKnownZero + RHSVal) ^ (~LHSKnownZero ^ RHSVal));
// Now that we know which bits have carries, compute the known-1/0 sets.
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