+ if (func == PIPE_BLEND_ADD &&
+ lp_build_blend_factor_complementary(src_factor, dst_factor) && 0) {
+ /*
+ * Special case linear interpolation, (i.e., complementary factors).
+ */
+
+ LLVMValueRef weight;
+ if (src_factor < dst_factor) {
+ weight = lp_build_blend_soa_factor(&bld, src_factor, i);
+ res[i] = lp_build_lerp(&bld.base, weight, dst[i], src[i]);
+ } else {
+ weight = lp_build_blend_soa_factor(&bld, dst_factor, i);
+ res[i] = lp_build_lerp(&bld.base, weight, src[i], dst[i]);
+ }
+ continue;
+ }
+
+ if ((func == PIPE_BLEND_ADD ||
+ func == PIPE_BLEND_SUBTRACT ||
+ func == PIPE_BLEND_REVERSE_SUBTRACT) &&
+ src_factor == dst_factor &&
+ type.floating) {
+ /*
+ * Special common factor.
+ *
+ * XXX: Only for floating points for now, since saturation will
+ * cause different results.
+ */
+
+ LLVMValueRef factor;
+ factor = lp_build_blend_soa_factor(&bld, src_factor, i);
+ res[i] = lp_build_blend_func(&bld.base, func, src[i], dst[i]);
+ res[i] = lp_build_mul(&bld.base, res[i], factor);
+ continue;
+ }