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r300/compiler: Handle loops in the register allocator.

This commit is contained in:
Tom Stellard 2010-08-11 09:24:07 -07:00
parent 481b65abae
commit 953e39c61d
1 changed files with 34 additions and 4 deletions
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38
src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c
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@ -65,6 +65,11 @@ struct regalloc_state {
struct hardware_register * HwTemporary;
unsigned int NumHwTemporaries;
/**
* If an instruction is inside of a loop, end_loop will be the
* IP of the ENDLOOP instruction, otherwise end_loop will be 0
*/
int end_loop;
};
static void print_live_intervals(struct live_intervals * src)
@ -178,10 +183,10 @@ static void scan_callback(void * data, struct rc_instruction * inst,
else
reg->Live.Start = inst->IP;
reg->Live.End = inst->IP;
} else {
if (inst->IP > reg->Live.End)
reg->Live.End = inst->IP;
}
} else if (s->end_loop)
reg->Live.End = s->end_loop;
else if (inst->IP > reg->Live.End)
reg->Live.End = inst->IP;
}
static void compute_live_intervals(struct regalloc_state * s)
@ -191,6 +196,31 @@ static void compute_live_intervals(struct regalloc_state * s)
for(struct rc_instruction * inst = s->C->Program.Instructions.Next;
inst != &s->C->Program.Instructions;
inst = inst->Next) {
/* For all instructions inside of a loop, the ENDLOOP
* instruction is used as the end of the live interval. */
if (inst->U.I.Opcode == RC_OPCODE_BGNLOOP && !s->end_loop) {
int loops = 1;
struct rc_instruction * tmp;
for(tmp = inst->Next;
tmp != &s->C->Program.Instructions;
tmp = tmp->Next) {
if (tmp->U.I.Opcode == RC_OPCODE_BGNLOOP) {
loops++;
break;
} else if (tmp->U.I.Opcode
== RC_OPCODE_ENDLOOP) {
if(!--loops) {
s->end_loop = tmp->IP;
break;
}
}
}
}
if (inst->IP == s->end_loop)
s->end_loop = 0;
rc_for_all_reads_mask(inst, scan_callback, s);
rc_for_all_writes_mask(inst, scan_callback, s);
}