+static const unsigned char
+swizzle_top[4] = {
+ QUAD_TOP_LEFT, QUAD_TOP_RIGHT,
+ QUAD_TOP_LEFT, QUAD_TOP_RIGHT
+};
+
+static const unsigned char
+swizzle_bottom[4] = {
+ QUAD_BOTTOM_LEFT, QUAD_BOTTOM_RIGHT,
+ QUAD_BOTTOM_LEFT, QUAD_BOTTOM_RIGHT
+};
+
+
+static LLVMValueRef
+emit_ddx(struct lp_build_tgsi_soa_context *bld,
+ LLVMValueRef src)
+{
+ LLVMValueRef src_left = lp_build_swizzle1_aos(&bld->base, src, swizzle_left);
+ LLVMValueRef src_right = lp_build_swizzle1_aos(&bld->base, src, swizzle_right);
+ return lp_build_sub(&bld->base, src_right, src_left);
+}
+
+
+static LLVMValueRef
+emit_ddy(struct lp_build_tgsi_soa_context *bld,
+ LLVMValueRef src)
+{
+ LLVMValueRef src_top = lp_build_swizzle1_aos(&bld->base, src, swizzle_top);
+ LLVMValueRef src_bottom = lp_build_swizzle1_aos(&bld->base, src, swizzle_bottom);
+ return lp_build_sub(&bld->base, src_top, src_bottom);
+}
+