Haswell kernels fail with GCC 15

[loveshack]

After applying #844 the x86_64 build fails with pre-release GCC 15 like this:

Compiling obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8m.o ('haswell' CFLAGS for kernels)
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8m.c: In function ‘bli_dgemmsup_rv_
haswell_asm_6x6m’:
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8m.c:1763:1: error: bp cannot be us
ed in ‘asm’ here
 1763 | }
      | ^
compilation terminated due to -Wfatal-errors.
6x8m.o] Error 1
Compiling obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8n.o ('haswell' CFLAGS for kernels)
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8n.c: In function ‘bli_dgemmsup_rv_haswell_asm_6x8n’:
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8n.c:948:1: error: bp cannot be used in ‘asm’ here
  948 | }
      | ^
compilation terminated due to -Wfatal-errors.
make: *** [Makefile:755: obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_d6x8n.o] Error 1
Compiling obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16m.o ('haswell' CFLAGS for kernels)
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16m.c: In function ‘bli_sgemmsup_rv_haswell_asm_6x12m’:
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16m.c:1985:1: error: bp cannot be used in ‘asm’ here
 1985 | }
      | ^
compilation terminated due to -Wfatal-errors.
make: *** [Makefile:755: obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16m.o] Error 1
Compiling obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16n.o ('haswell' CFLAGS for kernels)
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16n.c: In function ‘bli_sgemmsup_rv
_haswell_asm_6x16n’:
kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16n.c:1083:1: error: bp cannot be u
sed in ‘asm’ here
 1083 | }
      | ^
compilation terminated due to -Wfatal-errors.
make: *** [Makefile:755: obj/intel64/kernels/haswell/3/sup/bli_gemmsup_rv_haswell_asm_s6x16n.o] Error 1

[devinamatthews]

I think we have to just bite the bullet and take rbp out of all the gemmsup kernels.

[chillenb]

These kernels will build on GCC 15.1 with the option -fno-tree-slp-vectorize . One way to accomplish this is to put

#pragma GCC optimize("-fno-tree-slp-vectorize")

at the top of affected kernel source files.

[devinamatthews]

@chillenb I like this suggestion. Will implement shortly.

[devinamatthews]

@loveshack @chillenb please try the linked PR. I can verify the fix with gcc 15.1 on Zen3 (but running with haswell kernels).

[chillenb]

Works for me too, on consumer Haswell (Coffee Lake) with gcc 15.1.1. The fast test suite passes but I haven't run the long one.