diff options
| author | Tom Stellard <[email protected]> | 2010-08-11 09:24:07 -0700 |
|---|---|---|
| committer | Tom Stellard <[email protected]> | 2010-08-11 11:39:57 -0700 |
| commit | 953e39c61d051feb9f4f25f8390045c18f211d2a (patch) | |
| tree | 48407ea69e2c4780c184ce18196342f064ac5443 | |
| parent | 481b65abaedb271d0da24c75b8c60f7bcf6d8ce9 (diff) | |
r300/compiler: Handle loops in the register allocator.
| -rw-r--r-- | src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c b/src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c index 8a912da4613..ce72cd97ab2 100644 --- a/src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c +++ b/src/mesa/drivers/dri/r300/compiler/radeon_pair_regalloc.c @@ -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); } |