76c3041b85
Following a suggestion from Tamar, this patch adds a fallback implementation of usdot using sdot. Specifically, for 8-bit input types: acc_2 = DOT_PROD_EXPR <a_unsigned, b_signed, acc_1>; becomes: tmp_1 = DOT_PROD_EXPR <64, b_signed, acc_1>; tmp_2 = DOT_PROD_EXPR <64, b_signed, tmp_1>; acc_2 = DOT_PROD_EXPR <a_unsigned - 128, b_signed, tmp_2>; on the basis that (x-128)*y + 64*y + 64*y. Doing the two 64*y operations first should give more time for x to be calculated, on the off chance that that's useful. gcc/ * tree-vect-patterns.cc (vect_convert_input): Expect the input type to be signed for optab_vector_mixed_sign. Update the vectype at the same time as type. (vect_recog_dot_prod_pattern): Update accordingly. If usdot isn't available, try sdot instead. * tree-vect-loop.cc (vect_is_emulated_mixed_dot_prod): New function. (vect_model_reduction_cost): Model the cost of implementing usdot using sdot. (vectorizable_reduction): Likewise. Skip target support test for lane reductions. (vect_emulate_mixed_dot_prod): New function. (vect_transform_reduction): Use it to emulate usdot via sdot. gcc/testsuite/ * gcc.dg/vect/vect-reduc-dot-9.c: Reduce target requirements from i8mm to dotprod. * gcc.dg/vect/vect-reduc-dot-10.c: Likewise. * gcc.dg/vect/vect-reduc-dot-11.c: Likewise. * gcc.dg/vect/vect-reduc-dot-12.c: Likewise. * gcc.dg/vect/vect-reduc-dot-13.c: Likewise. * gcc.dg/vect/vect-reduc-dot-14.c: Likewise. * gcc.dg/vect/vect-reduc-dot-15.c: Likewise. * gcc.dg/vect/vect-reduc-dot-16.c: Likewise. * gcc.dg/vect/vect-reduc-dot-17.c: Likewise. * gcc.dg/vect/vect-reduc-dot-18.c: Likewise. * gcc.dg/vect/vect-reduc-dot-19.c: Likewise. * gcc.dg/vect/vect-reduc-dot-20.c: Likewise. * gcc.dg/vect/vect-reduc-dot-21.c: Likewise. * gcc.dg/vect/vect-reduc-dot-22.c: Likewise. |
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