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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/110625] [AArch64] Vect: SLP fails to vectorize a loop as
 the reduction_latency calculated by new costs is too large
Date: Tue, 01 Aug 2023 13:49:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110625

--- Comment #18 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Hi, here's the reduced case:

----
> cat analyse.i

double x264_weights_analyse___trans_tmp_1;
float x264_weights_analyse_ref_mean;
x264_weights_analyse() {
  x264_weights_analyse___trans_tmp_1 =3D floor(x264_weights_analyse_ref_mea=
n);
}

----
> cat pixel.i

unsigned x264_pixel_satd_8x4___trans_tmp_1;
x264_pixel_satd_8x4_sum;
x264_pixel_satd_8x4() {
  for (int i; i; i++) {
    x264_pixel_satd_8x4___trans_tmp_1 =3D i;
    x264_pixel_satd_8x4_sum +=3D x264_pixel_satd_8x4___trans_tmp_1;
  }
  return (unsigned)x264_pixel_satd_8x4_sum >> 1;
}

---

reproduce with:

gcc -c -o pixel.o pixel.i -mcpu=3Dneoverse-v1 -flto=3Dauto -Ofast -w
gcc -c -o analyse.o analyse.i -mcpu=3Dneoverse-v1 -flto=3Dauto -Ofast -w
gcc -flto=3Dauto -Ofast pixel.o analyse.o -lm -o x264_r -r -w=