[llvm] r297178 - [X86] Add option to specify preferable loop alignment

[Sanjoy Das via llvm-commits]

Author: sanjoy
Date: Tue Mar  7 12:47:22 2017
New Revision: 297178

URL: http://llvm.org/viewvc/llvm-project?rev=297178&view=rev
Log:
[X86] Add option to specify preferable loop alignment

Summary:
Loop alignment can cause a significant change of
the perfromance for short loops.
To be able to evaluate the impact of loop alignment this change
introduces the new option x86-experimental-pref-loop-alignment.
The alignment will be 2^Value bytes, the default value is 4.

Patch by Serguei Katkov!

Reviewers: craig.topper

Reviewed By: craig.topper

Subscribers: sanjoy, llvm-commits

Differential Revision: https://reviews.llvm.org/D30391

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=297178&r1=297177&r2=297178&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Tue Mar  7 12:47:22 2017
@@ -70,6 +70,13 @@ static cl::opt<bool> ExperimentalVectorW
              "rather than promotion."),
     cl::Hidden);
 
+static cl::opt<int> ExperimentalPrefLoopAlignment(
+    "x86-experimental-pref-loop-alignment", cl::init(4),
+    cl::desc("Sets the preferable loop alignment for experiments "
+             "(the last x86-experimental-pref-loop-alignment bits"
+             " of the loop header PC will be 0)."),
+    cl::Hidden);
+
 X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
                                      const X86Subtarget &STI)
     : TargetLowering(TM), Subtarget(STI) {
@@ -1724,7 +1731,8 @@ X86TargetLowering::X86TargetLowering(con
   MaxStoresPerMemcpyOptSize = 4;
   MaxStoresPerMemmove = 8; // For @llvm.memmove -> sequence of stores
   MaxStoresPerMemmoveOptSize = 4;
-  setPrefLoopAlignment(4); // 2^4 bytes.
+  // Set loop alignment to 2^ExperimentalPrefLoopAlignment bytes (default: 2^4).
+  setPrefLoopAlignment(ExperimentalPrefLoopAlignment);
 
   // An out-of-order CPU can speculatively execute past a predictable branch,
   // but a conditional move could be stalled by an expensive earlier operation.