static void pair_sub_for_all_args(
struct rc_instruction * fullinst,
struct rc_pair_sub_instruction * sub,
rc_pair_read_arg_fn cb,
void * userdata)
{
int i;
const struct rc_opcode_info * info = rc_get_opcode_info(sub->Opcode);
for(i = 0; i < info->NumSrcRegs; i++) {
unsigned int src_type;
src_type = rc_source_type_swz(sub->Arg[i].Swizzle);
if (src_type == RC_SOURCE_NONE)
continue;
if (sub->Arg[i].Source == RC_PAIR_PRESUB_SRC) {
unsigned int presub_type;
unsigned int presub_src_count;
struct rc_pair_instruction_source * src_array;
unsigned int j;
if (src_type & RC_SOURCE_RGB) {
presub_type = fullinst->
U.P.RGB.Src[RC_PAIR_PRESUB_SRC].Index;
src_array = fullinst->U.P.RGB.Src;
} else {
presub_type = fullinst->
U.P.Alpha.Src[RC_PAIR_PRESUB_SRC].Index;
src_array = fullinst->U.P.Alpha.Src;
}
presub_src_count
= rc_presubtract_src_reg_count(presub_type);
for(j = 0; j < presub_src_count; j++) {
cb(userdata, fullinst, &sub->Arg[i],
&src_array[j]);
}
} else {
struct rc_pair_instruction_source * src =
rc_pair_get_src(&fullinst->U.P, &sub->Arg[i]);
if (src) {
cb(userdata, fullinst, &sub->Arg[i], src);
}
}
}
}
static void mark_used(
struct rc_instruction * inst,
struct rc_pair_sub_instruction * sub)
{
unsigned int i;
const struct rc_opcode_info * info = rc_get_opcode_info(sub->Opcode);
for (i = 0; i < info->NumSrcRegs; i++) {
unsigned int src_type = rc_source_type_swz(sub->Arg[i].Swizzle);
if (src_type & RC_SOURCE_RGB) {
inst->U.P.RGB.Src[sub->Arg[i].Source].Used = 1;
}
if (src_type & RC_SOURCE_ALPHA) {
inst->U.P.Alpha.Src[sub->Arg[i].Source].Used = 1;
}
}
}
/* 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,
unsigned int type)
{
unsigned int srcp_src, srcp_regs, is_rgb, is_alpha;
struct rc_pair_sub_instruction * dst_sub;
const struct rc_opcode_info * info;
assert(dst_full->Alpha.Opcode == RC_OPCODE_NOP);
switch(type) {
case RC_SOURCE_RGB:
is_rgb = 1;
is_alpha = 0;
dst_sub = &dst_full->RGB;
break;
case RC_SOURCE_ALPHA:
is_rgb = 0;
is_alpha = 1;
dst_sub = &dst_full->Alpha;
break;
default:
assert(0);
return 0;
}
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);
if (free_source < 0)
return 0;
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_swz(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;
}
