https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96958
Bug ID: 96958
Summary: Long Double in Hash Table policy forces soft-float
calculations
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: jgreenhalgh at gcc dot gnu.org
Target Milestone: ---
It was pointed out that some forks of GCC (
https://github.com/FEX-Emu/gcc/commit/8a2b7389f50a50a4e26ec98101d47fb1fc1c1bcd
) reduce the hashtable policy implementation from a long double to a double.
Doing this reduces it from a soft-float calculation to hardware floating-point.
Reading the discussion on libstdc++ from when this code was introduced the
intention was to provide massive amounts of forwards compatibility for Very Big
hash tables. We're taking quite an efficiency hit for that future proofing.
