https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118175
--- Comment #2 from Huaqi <fanghuaqi at vip dot qq.com> --- (In reply to Andrew Pinski from comment #1) > Looks like an alias issue. > Changing the matrix definitions to: > extern float matA[], matB[], matC[]; > > > Allows GCC to vectorize the loop even for x86_64. Yes, it works. But when I changed the function name to void * CalculaProdutoMatriz(float *matA, float *matB, float *matC, void *arg), then it still not work, I expected it may work, since I think it just similiar to what you suggested. See https://godbolt.org/z/fEE5cMG9n And when I changed to above code, clang for riscv generate better vector instruction than before. Thanks
