https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110906
Bug ID: 110906
Summary: __attribute__((optimize("no-math-errno"))) has no
effect.
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: cassio.neri at gmail dot com
Target Milestone: ---
Consider this C++ code compiled with -O3:
double g(double x) {
return std::sqrt(x);
}
Usually this does call the library function std::sqrt because x might be
negative and errno needs to be set accordingly. Moreover, with -fno-math-errno
a single sqrtsd instruction is emitted. However, annotating g with
__attribute__((optimize("no-math-errno")))
has no effect. This attribute (and #pragma GCC optimize("no-math-errno") ) used
to work up to gcc 5.5.
https://godbolt.org/z/T1nb11bv5
