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[Bug middle-end/82004] New: SPEC CPU2017 628.pop2_s miscompare
- From: "andrey.y.guskov at intel dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 28 Aug 2017 09:51:27 +0000
- Subject: [Bug middle-end/82004] New: SPEC CPU2017 628.pop2_s miscompare
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82004
Bug ID: 82004
Summary: SPEC CPU2017 628.pop2_s miscompare
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: andrey.y.guskov at intel dot com
Target Milestone: ---
I`m seeing a miscompare in 628.pop2_s compiled with the following option set:
-m64 -march=core-avx2 -mfpmath=sse -Ofast -funroll-loops -fconvert=big-endian
-fopenmp
The guilty revision is r251230. Despite exp(log(c)*x) being faster, it seems to
lack the precision of pow(c,x).