[llvm] r370233 - [X86][ReleaseNotes] Add a note about the switch to widening legalization for narrow vectors.

Craig Topper via llvm-commits llvm-commits at lists.llvm.org
Wed Aug 28 10:18:56 PDT 2019


Author: ctopper
Date: Wed Aug 28 10:18:56 2019
New Revision: 370233

URL: http://llvm.org/viewvc/llvm-project?rev=370233&view=rev
Log:
[X86][ReleaseNotes] Add a note about the switch to widening legalization for narrow vectors.

Modified:
    llvm/trunk/docs/ReleaseNotes.rst

Modified: llvm/trunk/docs/ReleaseNotes.rst
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/docs/ReleaseNotes.rst?rev=370233&r1=370232&r2=370233&view=diff
==============================================================================
--- llvm/trunk/docs/ReleaseNotes.rst (original)
+++ llvm/trunk/docs/ReleaseNotes.rst Wed Aug 28 10:18:56 2019
@@ -85,6 +85,11 @@ Changes to the X86 Target
 
  During this release ...
 
+* Less than 128 bit vector types, v2i32, v4i16, v2i16, v8i8, v4i8, and v2i8, are
+  now stored in the lower bits of an xmm register and the upper bits are
+  undefined. Previously the elements were spread apart with undefined bits in
+  between them.
+
 Changes to the AMDGPU Target
 -----------------------------
 




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