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gallivm: Use 8 wide AoS sampling on AVX2.

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v2: Make sure that with num_lods > 1 and min_filter != mag_filter we
still enter the splitting path. So this case would still use 4-wide aos
path (as a side note, the 4-wide aos sampling path could actually be
improved quite a bit if we have avx2, by just doing the filtering with
256bit vectors).

Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Roland Scheidegger 2013-11-21 09:14:47 +00:00 • committed by Jose Fonseca
parent e088390c7d
commit bc80741d7a
1 changed files with 6 additions and 5 deletions
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11
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -2860,12 +2860,13 @@ lp_build_sample_soa_code(struct gallivm_state *gallivm,
}
/*
* we only try 8-wide sampling with soa as it appears to
* be a loss with aos with AVX (but it should work, except
* for conformance if min_filter != mag_filter if num_lods > 1).
* (It should be faster if we'd support avx2)
* we only try 8-wide sampling with soa or if we have AVX2
* as it appears to be a loss with just AVX)
*/
if (num_quads == 1 || !use_aos) {
if (num_quads == 1 || !use_aos ||
(util_cpu_caps.has_avx2 &&
(bld.num_lods == 1 ||
derived_sampler_state.min_img_filter == derived_sampler_state.mag_img_filter))) {
if (use_aos) {
/* do sampling/filtering with fixed pt arithmetic */
lp_build_sample_aos(&bld, sampler_index,