[PATCH] Loop Vectorizer doesn't use %zmm registers on targets supporting AVX512.

[Zinovy Nis]

Hi delena, rob.khasanov, volkalexey, nadav,

http://llvm-reviews.chandlerc.com/D3078

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3078?vs=7829&id=7830#toc

Files:
  lib/Target/X86/X86TargetTransformInfo.cpp

Index: lib/Target/X86/X86TargetTransformInfo.cpp
===================================================================
--- lib/Target/X86/X86TargetTransformInfo.cpp
+++ lib/Target/X86/X86TargetTransformInfo.cpp
@@ -148,6 +148,7 @@
 
 unsigned X86TTI::getRegisterBitWidth(bool Vector) const {
   if (Vector) {
+    if (ST->hasAVX512()) return 512;
     if (ST->hasAVX()) return 256;
     if (ST->hasSSE1()) return 128;
     return 0;
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