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pan/indirect: Factor out is_power_of_two_or_zero

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The function is complicated enough as it is -- hide the bit twiddling
behind a helper function.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11123>
This commit is contained in:
Alyssa Rosenzweig 2021-06-01 19:32:43 -04:00 • committed by Marge Bot
parent c25a40d535
commit 5ea73dbed9
1 changed files with 9 additions and 4 deletions
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13
src/panfrost/lib/pan_indirect_draw.c
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@ -558,6 +558,14 @@ adjust_attrib_offset(struct indirect_draw_shader_builder *builder,
} ENDIF
}
/* x is power of two or zero <===> x has 0 (zero) or 1 (POT) bits set */
static nir_ssa_def *
nir_is_power_of_two_or_zero(nir_builder *b, nir_ssa_def *x)
{
return nir_ilt(b, nir_bit_count(b, x), nir_imm_int(b, 2));
}
/* Based on panfrost_emit_vertex_data() */
static void
@ -636,10 +644,7 @@ update_vertex_attribs(struct indirect_draw_shader_builder *builder)
IF (nir_ine(b, div, nir_imm_int(b, 0))) {
IF (multi_instance) {
nir_ssa_def *div_pow2 =
nir_ilt(b, nir_bit_count(b, div), nir_imm_int(b, 2));
IF (div_pow2) {
IF (nir_is_power_of_two_or_zero(b, div)) {
nir_ssa_def *exp =
nir_imax(b, nir_ufind_msb(b, div),
nir_imm_int(b, 0));