https://llvm.org/bugs/show_bug.cgi?id=31515
Bug ID: 31515
Summary: test-suite/MultiSource/Benchmarks/mediabench/jpeg/jpeg
-6a/cjpeg.execution_time fails for KNL target starting
from r289653
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: elad2.co...@intel.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
test-suite/MultiSource/Benchmarks/mediabench/jpeg/jpeg-6a/cjpeg.execution_time
fails for KNL target.
I ran a 'git bisect' and pinned down commit 289653.
A diff on the test artifacts after and before the commit shows the following
changes in MultiSource/Benchmarks/mediabench/jpeg/jpeg-6a/jcdctmgr.s:
before:
vpandn %ymm0, %ymm1, %ymm0
after:
.LCPI2_0:
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
.short 1 # 0x1
...
vmovdqa .LCPI2_0(%rip), %ymm9 # ymm9 = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
...
vpxor %ymm9, %ymm1, %ymm1
vpand %ymm0, %ymm1, %ymm0
Looks like r289653 creates a XOR with [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
instead of "allones" in this specific case.
I'm working on uploading a fix.
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