[PPC] Early exit loop. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255497 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 176a8b3ea59b976e6e1557afbc79391b59c617cb..242c1ea330968844d8e55289c9dc7a02e55ccc77 100644 (file)
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -10801,8 +10801,11 @@ unsigned PPCTargetLowering::getPrefLoopAlignment(MachineLoop *ML) const {
     // boundary so that the entire loop fits in one instruction-cache line.
     uint64_t LoopSize = 0;
     for (auto I = ML->block_begin(), IE = ML->block_end(); I != IE; ++I)
     // boundary so that the entire loop fits in one instruction-cache line.
     uint64_t LoopSize = 0;
     for (auto I = ML->block_begin(), IE = ML->block_end(); I != IE; ++I)

-      for (auto J = (*I)->begin(), JE = (*I)->end(); J != JE; ++J)
+      for (auto J = (*I)->begin(), JE = (*I)->end(); J != JE; ++J) {

         LoopSize += TII->GetInstSizeInBytes(J);
         LoopSize += TII->GetInstSizeInBytes(J);

+        if (LoopSize > 32)
+          break;
+      }

 
     if (LoopSize > 16 && LoopSize <= 32)
       return 5;
 
     if (LoopSize > 16 && LoopSize <= 32)
       return 5;