https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90491
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-05-16
CC| |rguenth at gcc dot gnu.org,
| |uros at gcc dot gnu.org
Blocks| |53947
Summary|simple operation with |simple operation with
|unsigned integer and |unsigned long integer and
|conversion to float/double |conversion to float not
|not vectorized |vectorized
Ever confirmed|0 |1
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is the target claims it has no support for vectorized
unsigned long int to float conversion. Your int() cast makes it a
signed int to float conversion which is just cvtpd2ps.
What the vectorizer doesn't do but eventually could, with
knowledge of the value-range of i, is first truncate the unsigned long
vector to a unsigned int vector and then do the conversion to float.
Or alternatively use a vector long to vector double and then vector
double to vector float conversion series.
Or the target could hide these tricks from us.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
