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[Bug rtl-optimization/82454] Possible future performance regression in x86 for 64-bit constant expansions
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 09 Oct 2017 11:54:20 +0000
- Subject: [Bug rtl-optimization/82454] Possible future performance regression in x86 for 64-bit constant expansions
- Auto-submitted: auto-generated
- References: <bug-82454-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82454
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-10-09
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
__INT64_TYPE__ f1 (__INT64_TYPE__ i)
{
return (((__INT64_TYPE__)1) << 63) >> i;
}
is already an existing missed optimization.