[llvm-commits] [llvm] r99355 - /llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp

[Jim Grosbach]

Author: grosbach
Date: Tue Mar 23 19:03:13 2010
New Revision: 99355

URL: http://llvm.org/viewvc/llvm-project?rev=99355&view=rev
Log:
try being more permissive for if-conversion on ARM V7. see what the nightly
test run permformance numbers say as to whether it helps.

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

Modified: llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp?rev=99355&r1=99354&r2=99355&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMISelLowering.cpp Tue Mar 23 19:03:13 2010
@@ -40,12 +40,18 @@
 #include "llvm/MC/MCSectionMachO.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/ADT/VectorExtras.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
 #include <sstream>
 using namespace llvm;
 
+static cl::opt<bool>
+aggressiveV7IfConvert("arm-aggressive-v7-ifcvt", cl::Hidden,
+                      cl::desc("Enable more liberal if-converstion for v7"),
+                      cl::init(false));
+
 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
                                    CCValAssign::LocInfo &LocInfo,
                                    ISD::ArgFlagsTy &ArgFlags,
@@ -456,6 +462,9 @@
     // Generic (and overly aggressive) if-conversion limits.
     setIfCvtBlockSizeLimit(10);
     setIfCvtDupBlockSizeLimit(2);
+  } else if (aggressiveV7IfConvert && Subtarget->hasV7Ops()) {
+    setIfCvtBlockSizeLimit(3);
+    setIfCvtDupBlockSizeLimit(1);
   } else if (Subtarget->hasV6Ops()) {
     setIfCvtBlockSizeLimit(2);
     setIfCvtDupBlockSizeLimit(1);