Model ARM backend ABI selection after the front end code doing the

[oota-llvm.git] / lib / Target / ARM / ARMTargetTransformInfo.cpp

diff --git a/lib/Target/ARM/ARMTargetTransformInfo.cpp b/lib/Target/ARM/ARMTargetTransformInfo.cpp
index 75a556a261e1ba50b7f95177b4bba38ab5aa86bd..ec834e8da59997243483b6a494b287c5d5f611dd 100644 (file)
--- a/lib/Target/ARM/ARMTargetTransformInfo.cpp
+++ b/lib/Target/ARM/ARMTargetTransformInfo.cpp
@@ -390,6 +390,13 @@ unsigned ARMTTI::getVectorInstrCost(unsigned Opcode, Type *ValTy,
       ValTy->getScalarSizeInBits() <= 32)
     return 3;
 
+  // Cross-class copies are expensive on many microarchitectures,
+  // so assume they are expensive by default.
+  if ((Opcode == Instruction::InsertElement ||
+       Opcode == Instruction::ExtractElement) &&
+      ValTy->getVectorElementType()->isIntegerTy())
+    return 3;
+
   return TargetTransformInfo::getVectorInstrCost(Opcode, ValTy, Index);
 }