https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107283
Bug ID: 107283
Summary: conversions u/int64_t to float64/32_t are not
vectorized
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: g.peterh...@t-online.de
Target Milestone: ---
The conversions u/int64_t to float64/32_t are not vectorisized if no HW-support
(eg AVX512) available.
But we can do that manually
https://stackoverflow.com/questions/41144668/how-to-efficiently-perform-double-int64-conversions-with-sse-avx
In the case u/int64_t -> float32_t i first convert to float64_t and then to
float32_t. There might be a better way to implement this.
With HW-support the standard implementation is of course faster.
https://godbolt.org/z/WTa663PrK
thx
Gero
