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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100000] New: arm: Missed optimisation storing V4DF vector
Date: Fri, 09 Apr 2021 14:43:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100000

            Bug ID: 100000
           Summary: arm: Missed optimisation storing V4DF vector
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

typedef float __attribute((vector_size(16))) v4sf;

v4sf f(v4sf *p)
{
    return *p;
}

gives:

f:
        vldrw.32        q0, [r0]
        sub     sp, sp, #32
        add     sp, sp, #32
        bx      lr

with -march=3Darmv8.1-m.main+mve -mfloat-abi=3Dhard -O2 but the sub/add is
redundant.=