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[Bug math/24603] New: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with -O3 -march=skylake
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 22 May 2019 19:07:42 +0000
- Subject: [Bug math/24603] New: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with -O3 -march=skylake
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=24603
Bug ID: 24603
Summary: sysdeps/ieee754/dbl-64/branred.c is slow when compiled
with -O3 -march=skylake
Product: glibc
Version: 2.31
Status: NEW
Severity: normal
Priority: P2
Component: math
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: x86-64
sysdeps/ieee754/dbl-64/branred.c is very slow when compiled with -O3
-march=skylake due to huge store forward stall:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90579
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