On Thu, Mar 07, 2019 at 11:34:50AM -0600, Jason Ekstrand wrote:
> Because we already know the immediate right-hand parameter, we can
> potentially save the optimizer a bit of work.
> ---
> src/compiler/nir/nir_builder.h | 25 +++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
Reviewed-by: Caio Marcelo de Oliveira Filho
There's a single case in
src/compiler/spirv/vtn_variables.c:^vtn_access_link_as_ssa
that does a check for != 1 before multiply. Maybe remove it too?
> diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h
> index cd760c8d9ef..56e76ddcb39 100644
> --- a/src/compiler/nir/nir_builder.h
> +++ b/src/compiler/nir/nir_builder.h
> @@ -25,6 +25,7 @@
> #define NIR_BUILDER_H
>
> #include "nir_control_flow.h"
> +#include "util/bitscan.h"
> #include "util/half_float.h"
>
> struct exec_list;
> @@ -601,13 +602,33 @@ nir_u2u(nir_builder *build, nir_ssa_def *x, unsigned
> dest_bit_size)
> static inline nir_ssa_def *
> nir_iadd_imm(nir_builder *build, nir_ssa_def *x, uint64_t y)
> {
> - return nir_iadd(build, x, nir_imm_intN_t(build, y, x->bit_size));
> + assert(x->bit_size <= 64);
> + if (x->bit_size < 64)
> + y &= (1ull << x->bit_size) - 1;
> +
> + if (y == 0) {
> + return x;
> + } else {
> + return nir_iadd(build, x, nir_imm_intN_t(build, y, x->bit_size));
> + }
> }
>
> static inline nir_ssa_def *
> nir_imul_imm(nir_builder *build, nir_ssa_def *x, uint64_t y)
> {
> - return nir_imul(build, x, nir_imm_intN_t(build, y, x->bit_size));
> + assert(x->bit_size <= 64);
> + if (x->bit_size < 64)
> + y &= (1ull << x->bit_size) - 1;
> +
> + if (y == 0) {
> + return nir_imm_intN_t(build, 0, x->bit_size);
> + } else if (y == 1) {
> + return x;
> + } else if (util_is_power_of_two_or_zero64(y)) {
> + return nir_ishl(build, x, nir_imm_int(build, ffsll(y) - 1));
> + } else {
> + return nir_imul(build, x, nir_imm_intN_t(build, y, x->bit_size));
> + }
> }
>
> static inline nir_ssa_def *
> --
> 2.20.1
>
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Caio
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