public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug target/114829] New: No fcsel produced for f16
@ 2024-04-23 22:47 pinskia at gcc dot gnu.org
  0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2024-04-23 22:47 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114829

            Bug ID: 114829
           Summary: No fcsel produced for f16
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
void
foo (int a, _Float16 b1, _Float16 b2, _Float16 *b)
{
  *b = a ? b1 : b2;
}

```

This should produce:
```
foo:
        cmp     w0, #0
        fcsel   h0, h1, h0, eq
        str     h0, [x1]
        ret
```

Or :
```
foo:
        cmp     w0, #0
        fcsel   s0, s1, s0, eq
        str     h0, [x1]
        ret
```

Depending on if we have fp16 enabled or not.

Right now GCC produces branches instead.

Noticed while working on PR 98477 since *cmov<mode>_insn pattern uses GPF
iterator and not GPF_F16.

^ permalink raw reply	[flat|nested] only message in thread
only message in thread, other threads:[~2024-04-23 22:47 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-04-23 22:47 [Bug target/114829] New: No fcsel produced for f16 pinskia at gcc dot gnu.org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).