fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-09 04:38:03 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

r300/compiler: Don't unroll loops that conditionally increment the counter

Browse source
This commit is contained in:
Tom Stellard 2011-09-15 18:24:55 -07:00
parent 79b162ba45
commit 96620d2275
1 changed files with 14 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
src/gallium/drivers/r300/compiler/radeon_emulate_loops.c
View file

@ -51,6 +51,7 @@ struct count_inst {
rc_swizzle Swz;
float Amount;
int Unknown;
unsigned BranchDepth;
};
static float get_constant_value(struct radeon_compiler * c,
@ -141,6 +142,14 @@ static void get_incr_amount(void * data, struct rc_instruction * inst,
(1 << GET_SWZ(count_inst->Swz,0) != mask)){
return;
}
/* XXX: Give up if the counter is modified within an IF block. We
* could handle this case with better analysis. */
if (count_inst->BranchDepth > 0) {
count_inst->Unknown = 1;
return;
}
/* Find the index of the counter register. */
opcode = rc_get_opcode_info(inst->U.I.Opcode);
if(opcode->NumSrcRegs != 2){
@ -236,6 +245,7 @@ static int try_unroll_loop(struct radeon_compiler * c, struct loop_info * loop)
count_inst.Swz = counter->Swizzle;
count_inst.Amount = 0.0f;
count_inst.Unknown = 0;
count_inst.BranchDepth = 0;
end_loops = 1;
for(inst = loop->BeginLoop->Next; end_loops > 0; inst = inst->Next){
switch(inst->U.I.Opcode){
@ -258,9 +268,11 @@ static int try_unroll_loop(struct radeon_compiler * c, struct loop_info * loop)
return 0;
}
break;
/* XXX Check if the counter is modified within an if statement.
*/
case RC_OPCODE_IF:
count_inst.BranchDepth++;
break;
case RC_OPCODE_ENDIF:
count_inst.BranchDepth--;
break;
default:
rc_for_all_writes_mask(inst, get_incr_amount, &count_inst);