Change if-conversion block size limit checks to add some flexibility.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106901 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/Thumb2InstrInfo.cpp b/lib/Target/ARM/Thumb2InstrInfo.cpp
index 42fe509..d7c86c6 100644
--- a/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb2InstrInfo.cpp
@@ -24,9 +24,18 @@
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/CommandLine.h"
using namespace llvm;
+static cl::opt<unsigned>
+IfCvtLimit("thumb2-ifcvt-limit (default 3)",
+ cl::Hidden, cl::init(3));
+
+static cl::opt<unsigned>
+IfCvtDiamondLimit("thumb2-ifcvt-diamond-limit (default 3)",
+ cl::Hidden, cl::init(3));
+
Thumb2InstrInfo::Thumb2InstrInfo(const ARMSubtarget &STI)
: ARMBaseInstrInfo(STI), RI(*this, STI) {
}
@@ -94,6 +103,20 @@
return llvm::getITInstrPredicate(MBBI, PredReg) == ARMCC::AL;
}
+bool Thumb2InstrInfo::isProfitableToIfCvt(MachineBasicBlock &MBB,
+ unsigned NumInstrs) const {
+ return NumInstrs && NumInstrs <= IfCvtLimit;
+}
+
+bool Thumb2InstrInfo::
+isProfitableToIfCvt(MachineBasicBlock &TMBB, unsigned NumT,
+ MachineBasicBlock &FMBB, unsigned NumF) const {
+ // FIXME: Catch optimization such as:
+ // r0 = movne
+ // r0 = moveq
+ return NumT && NumF &&
+ NumT <= (IfCvtDiamondLimit) && NumF <= (IfCvtDiamondLimit);
+}
bool
Thumb2InstrInfo::copyRegToReg(MachineBasicBlock &MBB,