[llvm-commits] [llvm] r110579 - /llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp

[Evan Cheng]

Author: evancheng
Date: Mon Aug  9 12:16:10 2010
New Revision: 110579

URL: http://llvm.org/viewvc/llvm-project?rev=110579&view=rev
Log:
Add an option to disable 32 -> 16-bit Thumb2 size reduction pass for experimentation.

Modified:
    llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp

Modified: llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp?rev=110579&r1=110578&r2=110579&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMTargetMachine.cpp Mon Aug  9 12:16:10 2010
@@ -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());