https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86467
Bug ID: 86467
Summary: inlining strcmp with small known length array
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: qinzhao at gcc dot gnu.org
Target Milestone: ---
from Martin Sebor:
an enhancement to this optimization implemented for 78809 that might
be worth considering is inlining even non-constant calls
with array arguments whose size is no greater than the limit.
As in:
extern char a[4], *b;
int n = strcmp (a, b);
Because strcmp arguments are required to be nul-terminated
strings, a's length above must be at most 3. This is analogous
to similar optimizations GCC performs, such as folding to zero
calls to strlen() with one-element arrays.
