https://llvm.org/bugs/show_bug.cgi?id=26561
Bug ID: 26561
Summary: spec2000/188.ammp miscompare fail on IA64 HSW
architecture after commit r260063
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: sergey.k.oku...@gmail.com
CC: llvm-bugs@lists.llvm.org, llvm-...@redking.me.uk,
sergey.k.oku...@gmail.com, sergos....@gmail.com,
spatel+l...@rotateright.com, zia.ans...@intel.com
Classification: Unclassified
Bisect analysis showed LLVM revision 260063 is responsible for the fail. The
comments to commit are the following.
commit 392b9d21fce095df29f5a549c4a7d9d59761b32f
Author: Simon Pilgrim <llvm-...@redking.me.uk>
Date: Sun Feb 7 22:51:06 2016 +0000
[X86][SSE] Resolve target shuffle inputs to sentinels to permit more
combines
The combineX86ShufflesRecursively only supports unary shuffles, but was
missing the opportunity to combine binary shuffles with a zero / undef second
input.
This patch resolves target shuffle inputs, converting the shuffle mask
elements to SM_SentinelUndef/SM_SentinelZero where possible. It then resolves
the updated mask to check if we have created a faux unary shuffle.
Additionally, we now attempt to recursively call
combineX86ShufflesRecursively for all input operands (we used to just recurse
for unary integer shuffles and unary unpacks) - it safely returns early if its
not a target shuffle.
Differential Revision: http://reviews.llvm.org/D16683
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260063
91177308-0d34-0410-b5e6-96231b3b80d8
LLVM-clang options: -m64 -fuse-ld=gold -static -O2 -ffast-math -march=core-avx2
The failure is reproduced in concurrent applying of “-ffast-math
-march=core-avx2” options only.
spec2000 harness gives the following miscompare message (file – ammp.out.cmp).
0012: 1183.095771 bond energy
1036.076023 bond energy
^
0013: 2140.779933 angle energy
2049.475812 angle energy
^
0014: 67.674876 hybrid energy
63.753323 hybrid energy
^
0016: -15738.937252 non-bonded energy
-14111.964160 non-bonded energy
^
0017: -11819.178977 total potential energy
-10434.282631 total potential energy
^
0018: 8533.288451 total kinetic energy
8588.981709 total kinetic energy
^
0019: -3285.890527 total energy
-1845.300921 total energy
^
0020: 20352.467428 total action
19023.264340 total action
^
0025: 1232.045367 bond energy
1061.815654 bond energy
^
0026: 2228.827988 angle energy
2053.136001 angle energy
^
0027: 69.507047 hybrid energy
65.092695 hybrid energy
Okunev Sergey,
Software Engineer
Intel Compiler Team
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