Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.480 -> 1.481
---
Log message:
Add/Sub/Mul are safe to promote here as well. Incrementing a single-bit
bitfield now gives this code:
_plus:
lwz r2, 0(r3)
rlwimi r2, r2, 0, 1, 31
xoris r2, r2, 32768
stw r2, 0(r3)
blr
instead of this:
_plus:
lwz r2, 0(r3)
srwi r4, r2, 31
slwi r4, r4, 31
addis r4, r4, -32768
rlwimi r2, r4, 0, 0, 0
stw r2, 0(r3)
blr
this can obviously still be improved.
---
Diffs of the changes: (+6 -0)
InstructionCombining.cpp | 6 ++++++
1 files changed, 6 insertions(+)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.480
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.481
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.480 Fri May 12
21:06:03 2006
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Fri May 12 21:16:08 2006
@@ -4793,6 +4793,9 @@
if (!I || !I->hasOneUse()) return false;
switch (I->getOpcode()) {
+ case Instruction::Add:
+ case Instruction::Sub:
+ case Instruction::Mul:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
@@ -4824,6 +4827,9 @@
Instruction *I = cast<Instruction>(V);
Instruction *Res;
switch (I->getOpcode()) {
+ case Instruction::Add:
+ case Instruction::Sub:
+ case Instruction::Mul:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor: {
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