}
}
+/* This is a helper function for destructive_merge_instructions(). It helps
+ * merge presubtract sources from two instructions and makes sure the
+ * presubtract sources end up in the correct spot. This function assumes that
+ * dst_full is an rgb instruction, meaning that it has a vector instruction(rgb)
+ * but no scalar instruction (alpha).
+ * @return 0 if merging the presubtract sources fails.
+ * @retrun 1 if merging the presubtract sources succeeds.
+ */
+static int merge_presub_sources(
+ struct rc_pair_instruction * dst_full,
+ struct rc_pair_sub_instruction src,
+ rc_pair_source_type type)
+{
+ unsigned int srcp_src, srcp_regs, is_rgb, is_alpha;
+ struct rc_pair_sub_instruction * dst_sub;
+
+ assert(dst_full->Alpha.Opcode == RC_OPCODE_NOP);
+
+ switch(type) {
+ case RC_PAIR_SOURCE_RGB:
+ is_rgb = 1;
+ is_alpha = 0;
+ dst_sub = &dst_full->RGB;
+ break;
+ case RC_PAIR_SOURCE_ALPHA:
+ is_rgb = 0;
+ is_alpha = 1;
+ dst_sub = &dst_full->Alpha;
+ break;
+ default:
+ assert(0);
+ return 0;
+ }
+
+ const struct rc_opcode_info * info =
+ rc_get_opcode_info(dst_full->RGB.Opcode);
+ if (dst_sub->Src[RC_PAIR_PRESUB_SRC].Used)
+ return 0;
+
+ srcp_regs = rc_presubtract_src_reg_count(
+ src.Src[RC_PAIR_PRESUB_SRC].Index);
+ for(srcp_src = 0; srcp_src < srcp_regs; srcp_src++) {
+ unsigned int arg;
+ int free_source;
+ unsigned int one_way = 0;
+ struct rc_pair_instruction_source srcp = src.Src[srcp_src];
+ struct rc_pair_instruction_source temp;
+
+ free_source = rc_pair_alloc_source(dst_full, is_rgb, is_alpha,
+ srcp.File, srcp.Index);
+
+ /* If free_source < 0 then there are no free source
+ * slots. */
+ if (free_source < 0)
+ return 0;
+
+ temp = dst_sub->Src[srcp_src];
+ dst_sub->Src[srcp_src] = dst_sub->Src[free_source];
+
+ /* srcp needs src0 and src1 to be the same */
+ if (free_source < srcp_src) {
+ if (!temp.Used)
+ continue;
+ free_source = rc_pair_alloc_source(dst_full, is_rgb,
+ is_alpha, temp.File, temp.Index);
+ one_way = 1;
+ } else {
+ dst_sub->Src[free_source] = temp;
+ }
+
+ /* If free_source == srcp_src, then the presubtract
+ * source is already in the correct place. */
+ if (free_source == srcp_src)
+ continue;
+
+ /* Shuffle the sources, so we can put the
+ * presubtract source in the correct place. */
+ for(arg = 0; arg < info->NumSrcRegs; arg++) {
+ /*If this arg does not read from an rgb source,
+ * do nothing. */
+ if (rc_source_type_that_arg_reads(
+ dst_full->RGB.Arg[arg].Source,
+ dst_full->RGB.Arg[arg].Swizzle, 3) != type) {
+ continue;
+ }
+ if (dst_full->RGB.Arg[arg].Source == srcp_src)
+ dst_full->RGB.Arg[arg].Source = free_source;
+ /* We need to do this just in case register
+ * is one of the sources already, but in the
+ * wrong spot. */
+ else if(dst_full->RGB.Arg[arg].Source == free_source
+ && !one_way) {
+ dst_full->RGB.Arg[arg].Source = srcp_src;
+ }
+ }
+ }
+ return 1;
+}
+
+/* This function assumes that rgb.Alpha and alpha.RGB are unused */
static int destructive_merge_instructions(
struct rc_pair_instruction * rgb,
struct rc_pair_instruction * alpha)
{
const struct rc_opcode_info * opcode;
- const struct rc_opcode_info * rgb_info;
assert(rgb->Alpha.Opcode == RC_OPCODE_NOP);
assert(alpha->RGB.Opcode == RC_OPCODE_NOP);
* src1. */
/* Merge the rgb presubtract registers. */
- rgb_info = rc_get_opcode_info(rgb->RGB.Opcode);
if (alpha->RGB.Src[RC_PAIR_PRESUB_SRC].Used) {
- unsigned int srcp_src;
- unsigned int srcp_regs;
- if (rgb->RGB.Src[RC_PAIR_PRESUB_SRC].Used)
+ if (!merge_presub_sources(rgb, alpha->RGB, RC_PAIR_SOURCE_RGB)) {
return 0;
- srcp_regs = rc_presubtract_src_reg_count(
- alpha->RGB.Src[RC_PAIR_PRESUB_SRC].Index);
- for(srcp_src = 0; srcp_src < srcp_regs; srcp_src++) {
- unsigned int arg;
- int free_source;
- unsigned int one_way = 0;
- struct rc_pair_instruction_source srcp =
- alpha->RGB.Src[srcp_src];
- struct rc_pair_instruction_source temp;
- /* 2nd arg of 1 means this is an rgb source.
- * 3rd arg of 0 means this is not an alpha source. */
- free_source = rc_pair_alloc_source(rgb, 1, 0,
- srcp.File, srcp.Index);
- /* If free_source < 0 then there are no free source
- * slots. */
- if (free_source < 0)
- return 0;
-
- temp = rgb->RGB.Src[srcp_src];
- rgb->RGB.Src[srcp_src] = rgb->RGB.Src[free_source];
- /* srcp needs src0 and src1 to be the same */
- if (free_source < srcp_src) {
- if (!temp.Used)
- continue;
- free_source = rc_pair_alloc_source(rgb, 1, 0,
- srcp.File, srcp.Index);
- one_way = 1;
- } else {
- rgb->RGB.Src[free_source] = temp;
- }
- /* If free_source == srcp_src, then the presubtract
- * source is already in the correct place. */
- if (free_source == srcp_src)
- continue;
- /* Shuffle the sources, so we can put the
- * presubtract source in the correct place. */
- for (arg = 0; arg < rgb_info->NumSrcRegs; arg++) {
- /*If this arg does not read from an rgb source,
- * do nothing. */
- if (rc_source_type_that_arg_reads(
- rgb->RGB.Arg[arg].Source,
- rgb->RGB.Arg[arg].Swizzle, 3)
- != RC_PAIR_SOURCE_RGB) {
- continue;
- }
- if (rgb->RGB.Arg[arg].Source == srcp_src)
- rgb->RGB.Arg[arg].Source = free_source;
- /* We need to do this just in case register
- * is one of the sources already, but in the
- * wrong spot. */
- else if(rgb->RGB.Arg[arg].Source == free_source
- && !one_way) {
- rgb->RGB.Arg[arg].Source = srcp_src;
- }
- }
}
}
-
/* Merge the alpha presubtract registers */
if (alpha->Alpha.Src[RC_PAIR_PRESUB_SRC].Used) {
- unsigned int srcp_src;
- unsigned int srcp_regs;
- if(rgb->Alpha.Src[RC_PAIR_PRESUB_SRC].Used)
+ if(!merge_presub_sources(rgb, alpha->Alpha, RC_PAIR_SOURCE_ALPHA)){
return 0;
-
- srcp_regs = rc_presubtract_src_reg_count(
- alpha->Alpha.Src[RC_PAIR_PRESUB_SRC].Index);
- for(srcp_src = 0; srcp_src < srcp_regs; srcp_src++) {
- unsigned int arg;
- int free_source;
- unsigned int one_way = 0;
- struct rc_pair_instruction_source srcp =
- alpha->Alpha.Src[srcp_src];
- struct rc_pair_instruction_source temp;
- /* 2nd arg of 0 means this is not an rgb source.
- * 3rd arg of 1 means this is an alpha source. */
- free_source = rc_pair_alloc_source(rgb, 0, 1,
- srcp.File, srcp.Index);
- /* If free_source < 0 then there are no free source
- * slots. */
- if (free_source < 0)
- return 0;
-
- temp = rgb->Alpha.Src[srcp_src];
- rgb->Alpha.Src[srcp_src] = rgb->Alpha.Src[free_source];
- /* srcp needs src0 and src1 to be the same. */
- if (free_source < srcp_src) {
- if (!temp.Used)
- continue;
- free_source = rc_pair_alloc_source(rgb, 0, 1,
- temp.File, temp.Index);
- one_way = 1;
- } else {
- rgb->Alpha.Src[free_source] = temp;
- }
- /* If free_source == srcp_src, then the presubtract
- * source is already in the correct place. */
- if (free_source == srcp_src)
- continue;
- /* Shuffle the sources, so we can put the
- * presubtract source in the correct place. */
- for(arg = 0; arg < rgb_info->NumSrcRegs; arg++) {
- /*If this arg does not read from an alpha
- * source, do nothing. */
- if (rc_source_type_that_arg_reads(
- rgb->RGB.Arg[arg].Source,
- rgb->RGB.Arg[arg].Swizzle, 3)
- != RC_PAIR_SOURCE_ALPHA) {
- continue;
- }
- if (rgb->RGB.Arg[arg].Source == srcp_src)
- rgb->RGB.Arg[arg].Source = free_source;
- else if (rgb->RGB.Arg[arg].Source == free_source
- && !one_way) {
- rgb->RGB.Arg[arg].Source = srcp_src;
- }
- }
}
}
projects / mesa.git / commitdiff