https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88814
Bug ID: 88814
Summary: transform snprintf into memccpy
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
In addition to bug 88813, prompted by the discussion of the background on
pr88793 (https://bugzilla.redhat.com/show_bug.cgi?id=1480664), another
optimization opportunity is to replace snprintf(d, n, "%s", s) calls with
non-zero n with:
memccpy(d, s, 0, n - 1);
d[n - 1] = 0;
Memccpy is not a standard C function but it is in POSIX so GCC configury would
have to detect support for it in order to enable it. GCC also doesn't
recognize memccpy as a built-in so adding such support could yield additional
improvements.
