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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99593] [11 Regression] arm Neon ICE when compiling
 firefox (skia) since r11-6708
Date: Mon, 15 Mar 2021 10:29:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99593

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I've tried to reproduce it with
typedef __simd128_int32_t int32x4_t;

void
foo (int32x4_t c)
{
  int32x4_t b =3D __builtin_neon_vdup_nv4si (3);
  register int32x4_t a __asm ("d16");
  asm volatile ("" : "=3Dw" (a));
  a =3D a >> b;
  a |=3D c;
  asm volatile ("" : : "w" (a));
}
but it doesn't, for some reason the ICE needs a REG_EQUAL attribute on the
right shift into which we propagate the constant and LRA picks the constant
from there, but haven't managed to force that.=