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authorBrian Paul <brianp@vmware.com>2010-03-05 13:27:51 -0700
committerBrian Paul <brianp@vmware.com>2010-03-05 13:29:25 -0700
commit88e2eae271fc76f82f3c732e32d3faa3184353ff (patch)
treefaa01bf0899b73562ce7bc34739b9066cdaa5e0a
parentd660e28c9cc52e55963532939ef383eac983a44b (diff)
gallivm: minor arithmetic improvements
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c21
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 */