http://llvm.org/bugs/show_bug.cgi?id=17899
Bug ID: 17899
Summary: vector comparison 'less than' miscompiled on avx2
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11526
--> http://llvm.org/bugs/attachment.cgi?id=11526&action=edit
Sample reduced source to show the bug
The following OpenCL code is miscompiled when targeting core-avx2 CPU:s
c < (short16)0 ? b : a
Only 'less that' seems to be miscompiled, all other comparisons that I tried
give the correct result. Also all shorter that 16xi16 vectors work fine.
Attached is a tar.gz with complete example code. When compiling with CPU
corei7, the result is correct, when compiling with core-avx2 it is wrong:
$./run.sh corei7
res1.x=a
$./run.sh core-avx2
res1.x=b
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