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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-16 23:11:47 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-16 23:11:47 +0000 |
| commit | f2c64ef519b38a4328809b27b4a3a8e0c26e9709 (patch) | |
| tree | ce3233b4960acdefe47ab3644925c8196a84e3c3 /utils | |
| parent | 05b2bc8781d9af403a257599613e12cb8fef19e8 (diff) | |
| download | external_llvm-f2c64ef519b38a4328809b27b4a3a8e0c26e9709.zip external_llvm-f2c64ef519b38a4328809b27b4a3a8e0c26e9709.tar.gz external_llvm-f2c64ef519b38a4328809b27b4a3a8e0c26e9709.tar.bz2 | |
Add an MCID::Select flag and TII hooks for optimizing selects.
Select instructions pick one of two virtual registers based on a
condition, like x86 cmov. On targets like ARM that support predication,
selects can sometimes be eliminated by predicating the instruction
defining one of the operands.
Teach PeepholeOptimizer to recognize select instructions, and ask the
target to optimize them.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162059 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'utils')
| -rw-r--r-- | utils/TableGen/CodeGenInstruction.cpp | 1 | ||||
| -rw-r--r-- | utils/TableGen/CodeGenInstruction.h | 1 | ||||
| -rw-r--r-- | utils/TableGen/InstrInfoEmitter.cpp | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/utils/TableGen/CodeGenInstruction.cpp b/utils/TableGen/CodeGenInstruction.cpp index 33381e9..12e153a 100644 --- a/utils/TableGen/CodeGenInstruction.cpp +++ b/utils/TableGen/CodeGenInstruction.cpp @@ -297,6 +297,7 @@ CodeGenInstruction::CodeGenInstruction(Record *R) : TheDef(R), Operands(R) { isCompare = R->getValueAsBit("isCompare"); isMoveImm = R->getValueAsBit("isMoveImm"); isBitcast = R->getValueAsBit("isBitcast"); + isSelect = R->getValueAsBit("isSelect"); isBarrier = R->getValueAsBit("isBarrier"); isCall = R->getValueAsBit("isCall"); canFoldAsLoad = R->getValueAsBit("canFoldAsLoad"); diff --git a/utils/TableGen/CodeGenInstruction.h b/utils/TableGen/CodeGenInstruction.h index 3ba9f24..95b572d 100644 --- a/utils/TableGen/CodeGenInstruction.h +++ b/utils/TableGen/CodeGenInstruction.h @@ -222,6 +222,7 @@ namespace llvm { bool isCompare; bool isMoveImm; bool isBitcast; + bool isSelect; bool isBarrier; bool isCall; bool canFoldAsLoad; diff --git a/utils/TableGen/InstrInfoEmitter.cpp b/utils/TableGen/InstrInfoEmitter.cpp index 3adb869..b41ad94 100644 --- a/utils/TableGen/InstrInfoEmitter.cpp +++ b/utils/TableGen/InstrInfoEmitter.cpp @@ -319,6 +319,7 @@ void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num, if (Inst.isCompare) OS << "|(1<<MCID::Compare)"; if (Inst.isMoveImm) OS << "|(1<<MCID::MoveImm)"; if (Inst.isBitcast) OS << "|(1<<MCID::Bitcast)"; + if (Inst.isSelect) OS << "|(1<<MCID::Select)"; if (Inst.isBarrier) OS << "|(1<<MCID::Barrier)"; if (Inst.hasDelaySlot) OS << "|(1<<MCID::DelaySlot)"; if (Inst.isCall) OS << "|(1<<MCID::Call)"; |