https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80802
Bug ID: 80802
Summary: [7/8 Regression] VRP triggers (causes) a miscompile in
icu4c 58.2
Product: gcc
Version: 7.1.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
Target: i?86-*-*
Created attachment 41374
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41374&action=edit
unreduced testcase
On i586 icu4c is miscompiled by GCC 7 (but not GCC 6). We've sofar narrowed it
down to icu/source/i18n/precision.cpp function
FixedPrecision::initVisibleDigits double overload (preprocessed source
attached, function already marked with optimize attribute).
Disabling VRP1 "fixes" the issue but VRP1 does lots of threading and thus might
just uncover an issue elsewhere.
invalid source not yet ruled out completely.
