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From: "dmalcolm at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/109016] New: Analyzer doesn't know about OMP builtins
Date: Fri, 03 Mar 2023 19:13:23 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: analyzer
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: openmp
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dmalcolm at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109016

            Bug ID: 109016
           Summary: Analyzer doesn't know about OMP builtins
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: openmp
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

Created attachment 54581
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54581&action=3Dedit
Work in progress patch

Currently the analyzer doesn't recognize omp builtins, and falls back to the
"anything could happen" handler when it sees them.

Am attaching a work-in-progress patch I tried which terminates the analysis
path if it sees one of them, on the grounds that the analyzer currently has=
 no
knowledge of e.g. OpenMP.

Unfortunately, as-is, this regresses the integration tests (all in
ImageMagick-7.1.0-57); presumably due to spending its analysis budget on ot=
her
execution paths:

Comparison: 10.91% -> 10.77% GOOD: 67 BAD: 547 -> 555 (+8)
  -Wanalyzer-use-of-uninitialized-value: 0.00% GOOD: 0 BAD: 80 -> 87 (+7)
  -Wanalyzer-deref-before-check: 5.00% -> 4.76% GOOD: 1 BAD: 19 -> 20 (+1)=