[Bug 2126058] [NEW] FTBFS: pytorch fails to build on riscv64

[Heinrich Schuchardt]

Public bug reported:

Building pytorch 2.6.0+dfsg-9 failed on riscv64
https://launchpad.net/ubuntu/+source/pytorch/2.6.0+dfsg-9/+build/31323165

A GCC internal compiler error occurs:

18253: // during GIMPLE pass: lower
18253: // In file included from /<<PKGBUILDDIR>>/build/aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp.DEFAULT.cpp:1:
18253: // /<<PKGBUILDDIR>>/aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp: In function ‘void at::native::{anonymous}::winograd_f2k3_kernel_transform__rvv(vfloat32m1_t, vfloat32m1_t, vfloat32m1_t, vfloat32m1x4_t*)’:
18253: // /<<PKGBUILDDIR>>/aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp:307:44: internal compiler error: in gsi_replace, at gimple-iterator.cc:438
18253: //   307 |   *transform = __riscv_vset_v_f32m1_f32m1x4(*transform, 3, g2);
18253: //       |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

** Affects: gcc-15 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: pytorch (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: gcc-15 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2126058

Title:
  FTBFS: pytorch fails to build on riscv64

Status in gcc-15 package in Ubuntu:
  New
Status in pytorch package in Ubuntu:
  New

Bug description:
  Building pytorch 2.6.0+dfsg-9 failed on riscv64
  https://launchpad.net/ubuntu/+source/pytorch/2.6.0+dfsg-9/+build/31323165

  A GCC internal compiler error occurs:

  18253: // during GIMPLE pass: lower
  18253: // In file included from /<<PKGBUILDDIR>>/build/aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp.DEFAULT.cpp:1:
  18253: // /<<PKGBUILDDIR>>/aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp: In function ‘void at::native::{anonymous}::winograd_f2k3_kernel_transform__rvv(vfloat32m1_t, vfloat32m1_t, vfloat32m1_t, vfloat32m1x4_t*)’:
  18253: // /<<PKGBUILDDIR>>/aten/src/ATen/native/cpu/DepthwiseConvKernel.cpp:307:44: internal compiler error: in gsi_replace, at gimple-iterator.cc:438
  18253: //   307 |   *transform = __riscv_vset_v_f32m1_f32m1x4(*transform, 3, g2);
  18253: //       |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

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