https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67713
Bug ID: 67713
Summary: builtin cmpstrn not used if not one of the inputs is
not a string literal
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: olegendo at gcc dot gnu.org
Target Milestone: ---
It seems that the following
int test_06 (const char* s1)
{
return __builtin_strncmp (s1, "abcdabcd", 8);
}
will emit the builtin strncmp code, while
int test_07 (const char* s1, const char* s2)
{
return __builtin_strncmp (s1, s2, 8);
}
will always invoke the strncmp function.
This happens on trunk for SH and on GCC 4.9 (Ubuntu 4.9.2-10ubuntu13) for
x86_64. Not sure whether this is a tree or RTL issue, though.
