topic Re: Compiler Bug: ICX crashes with -O2 with __bf16 in Intel® oneAPI DPC++/C++ Compiler

Compiler Bug: ICX crashes with -O2 with __bf16

crocix — Mon, 25 Mar 2024 10:57:48 GMT

Compiling:

#include <stdlib.h> #include <stdio.h> #define M 4 __bf16 bf16test(__bf16* a){ __bf16 r = a[0]*a[1] - a[1]*a[2]; //__bf16 r = a[0]*a[1]; return r; } int main() { srandom(12345678); __bf16 ab[M]; for (long i = 0; i<M; i++){ ab[i] = (__bf16) (random()/((double) RAND_MAX)); } __bf16 rb = bf16test(ab); printf("Value bf16: %f\n", (double) rb); return 0; }

with

icx -O2 -march=sapphirerapids

makes the compiler (OneApi2024.0.0) crash with the error in the attached. You can use godbolt https://godbolt.org/ to reproduce it.

Re: Compiler Bug: ICX crashes with -O2 with __bf16

Alex_Y_Intel — Thu, 04 Apr 2024 00:44:02 GMT

This issue has been escalated to our engineers and we'll work on it internally and come back with update when we reach the conclusion.

Re: Compiler Bug: ICX crashes with -O2 with __bf16

Viet_H_Intel — Thu, 04 Apr 2024 01:42:52 GMT

This is a known issue and has been addressed. I checked our internal compiler and confirmed it worked.

$ icx -O2 -march=sapphirerapids t2.c -c
$

Re: Compiler Bug: ICX crashes with -O2 with __bf16

crocix — Thu, 04 Apr 2024 12:02:38 GMT

I confirm the issue has been fixed in oneAPI2024.1.0.

Thanks!