[llvm-branch-commits] [llvm-branch] r311593 - Merging r311572:

Hans Wennborg via llvm-branch-commits llvm-branch-commits at lists.llvm.org
Wed Aug 23 13:03:43 PDT 2017


Author: hans
Date: Wed Aug 23 13:03:43 2017
New Revision: 311593

URL: http://llvm.org/viewvc/llvm-project?rev=311593&view=rev
Log:
Merging r311572:
------------------------------------------------------------------------
r311572 | ctopper | 2017-08-23 09:41:02 -0700 (Wed, 23 Aug 2017) | 9 lines

[AVX512] Don't create SHRUNKBLEND SDNodes for 512-bit vectors

There are no 512-bit blend instructions so we shouldn't create SHRUNKBLEND for them.

On a side note, it looks like there may be a missed opportunity for constant folding TESTM when LHS and RHS are equal.

This fixes PR34139.

Differential Revision: https://reviews.llvm.org/D36992
------------------------------------------------------------------------

Added:
    llvm/branches/release_50/test/CodeGen/X86/pr34139.ll
      - copied unchanged from r311572, llvm/trunk/test/CodeGen/X86/pr34139.ll
Modified:
    llvm/branches/release_50/   (props changed)
    llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp

Propchange: llvm/branches/release_50/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Wed Aug 23 13:03:43 2017
@@ -1,3 +1,3 @@
 /llvm/branches/Apple/Pertwee:110850,110961
 /llvm/branches/type-system-rewrite:133420-134817
-/llvm/trunk:155241,308483-308484,308503,308808,308813,308847,308891,308906,308950,308963,308978,308986,309044,309071,309113,309120,309122,309140,309227,309302,309321,309323,309325,309330,309343,309353,309355,309422,309481,309483,309495,309555,309561,309594,309614,309651,309744,309758,309849,309928,309930,309945,310066,310071,310190,310240-310242,310250,310253,310262,310267,310481,310492,310498,310510,310534,310552,310604,310712,310779,310784,310796,310842,310906,310926,310939,310979,310988,310990-310991,311061,311068,311071,311087,311229,311258,311263,311387,311429
+/llvm/trunk:155241,308483-308484,308503,308808,308813,308847,308891,308906,308950,308963,308978,308986,309044,309071,309113,309120,309122,309140,309227,309302,309321,309323,309325,309330,309343,309353,309355,309422,309481,309483,309495,309555,309561,309594,309614,309651,309744,309758,309849,309928,309930,309945,310066,310071,310190,310240-310242,310250,310253,310262,310267,310481,310492,310498,310510,310534,310552,310604,310712,310779,310784,310796,310842,310906,310926,310939,310979,310988,310990-310991,311061,311068,311071,311087,311229,311258,311263,311387,311429,311572

Modified: llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp?rev=311593&r1=311592&r2=311593&view=diff
==============================================================================
--- llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/branches/release_50/lib/Target/X86/X86ISelLowering.cpp Wed Aug 23 13:03:43 2017
@@ -30629,6 +30629,9 @@ static SDValue combineSelect(SDNode *N,
     // Byte blends are only available in AVX2
     if (VT == MVT::v32i8 && !Subtarget.hasAVX2())
       return SDValue();
+    // There are no 512-bit blend instructions that use sign bits.
+    if (VT.is512BitVector())
+      return SDValue();
 
     assert(BitWidth >= 8 && BitWidth <= 64 && "Invalid mask size");
     APInt DemandedMask(APInt::getSignMask(BitWidth));




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