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* [Bug middle-end/91526] Unnecessary SSE and other instructions generated when compiling in C mode (vs. C++ mode)
[not found] <bug-91526-4@http.gcc.gnu.org/bugzilla/>
@ 2021-12-12 6:16 ` pinskia at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2021-12-12 6:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91526
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c |middle-end
Severity|normal |enhancement
--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
here is an example where the C++ front-end produces IR which causes the
opposite effect and the C front-end is better:
struct Vec { float v[8]; };
struct Vec multiply(const struct Vec* v1, const struct Vec* v2)
{
struct Vec result;
struct Vec result1, result2;
for(unsigned i = 0; i < 8; ++i)
result.v[i] = v1->v[i] * v2->v[i];
result1 = result;
result2 = result;
return result2;
}
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[not found] <bug-91526-4@http.gcc.gnu.org/bugzilla/>
2021-12-12 6:16 ` [Bug middle-end/91526] Unnecessary SSE and other instructions generated when compiling in C mode (vs. C++ mode) pinskia at gcc dot gnu.org
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