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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111733] New: Emit inline SVE FSCALE instruction for
 ldexp
Date: Mon, 09 Oct 2023 09:53:25 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ktkachov at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111733

            Bug ID: 111733
           Summary: Emit inline SVE FSCALE instruction for ldexp
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ktkachov at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64

Having noticed https://github.com/llvm/llvm-project/pull/67552 in LLVM GCC
should be able to emit the SVE fscale instruction [1] to implement the ldexp
standard function.

There is already an ldexpm3 optab defined so it should be a relatively simp=
le
matter of wiring up the expander for TARGET_SVE

[1]
https://developer.arm.com/documentation/ddi0596/2021-12/SVE-Instructions/FS=
CALE--Floating-point-adjust-exponent-by-vector--predicated--?lang=3Den=