diff options
| author | Brian Paul <[email protected]> | 2010-03-05 13:27:51 -0700 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2010-03-05 13:29:25 -0700 |
| commit | 88e2eae271fc76f82f3c732e32d3faa3184353ff (patch) | |
| tree | faa01bf0899b73562ce7bc34739b9066cdaa5e0a | |
| parent | d660e28c9cc52e55963532939ef383eac983a44b (diff) | |
gallivm: minor arithmetic improvements
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c index 50dd1a57c9f..2b04becc8cb 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c @@ -432,9 +432,10 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, { LLVMValueRef min, max; if (bld->static_state->normalized_coords) { - /* min = -1.0 / (2 * length) */ - min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); - min = lp_build_negate(coord_bld, min); + /* min = -1.0 / (2 * length) = -0.5 / length */ + min = lp_build_mul(coord_bld, + lp_build_const_scalar(coord_bld->type, -0.5F), + lp_build_rcp(coord_bld, length_f)); /* max = 1.0 - min */ max = lp_build_sub(coord_bld, coord_bld->one, min); /* coord = clamp(coord, min, max) */ @@ -518,9 +519,10 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER: { LLVMValueRef min, max; - /* min = -1.0 / (2 * length) */ - min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); - min = lp_build_negate(coord_bld, min); + /* min = -1.0 / (2 * length) = -0.5 / length */ + min = lp_build_mul(coord_bld, + lp_build_const_scalar(coord_bld->type, -0.5F), + lp_build_rcp(coord_bld, length_f)); /* max = 1.0 - min */ max = lp_build_sub(coord_bld, coord_bld->one, min); @@ -618,9 +620,10 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld, { LLVMValueRef min, max; if (bld->static_state->normalized_coords) { - /* min = -1.0 / (2 * length) */ - min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); - min = lp_build_negate(coord_bld, min); + /* min = -1.0 / (2 * length) = -0.5 / length */ + min = lp_build_mul(coord_bld, + lp_build_const_scalar(coord_bld->type, -0.5F), + lp_build_rcp(coord_bld, length_f)); /* max = length - min */ max = lp_build_sub(coord_bld, length_f, min); /* scale coord to length */ |