Add an option to disable 32 -> 16-bit Thumb2 size reduction pass for experimentation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110579 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index 9d7bf75..2c8460b 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -16,11 +16,17 @@
#include "ARM.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
using namespace llvm;
+static cl::opt<bool>
+Prefer32BitThumbInstrs("prefer-32bit-thumb",
+ cl::desc("Prefer 32-bit Thumb instructions"),
+ cl::init(false));
+
static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
Triple TheTriple(TT);
switch (TheTriple.getOS()) {
@@ -31,7 +37,6 @@
}
}
-
extern "C" void LLVMInitializeARMTarget() {
// Register the target.
RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
@@ -138,7 +143,7 @@
bool ARMBaseTargetMachine::addPreEmitPass(PassManagerBase &PM,
CodeGenOpt::Level OptLevel) {
- if (Subtarget.isThumb2())
+ if (!Prefer32BitThumbInstrs && Subtarget.isThumb2())
PM.add(createThumb2SizeReductionPass());
PM.add(createARMConstantIslandPass());