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i965/fs: Make count_to_loop_end() use basic blocks.

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When the instructions aren't in a flat list, this wouldn't have worked.
Also, this should be faster.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Matt Turner 2014-09-01 15:38:58 -07:00
parent 90bfeb2244
commit 235f451f7a
1 changed files with 16 additions and 15 deletions
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31
src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
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@ -190,27 +190,28 @@ brw_fs_alloc_reg_sets(struct intel_screen *screen)
brw_alloc_reg_set(screen, 2);
}
int
count_to_loop_end(fs_inst *do_inst)
static int
count_to_loop_end(const bblock_t *block)
{
if (block->end->opcode == BRW_OPCODE_WHILE)
return block->end_ip;
int depth = 1;
int ip = 1;
for (fs_inst *inst = (fs_inst *)do_inst->next;
/* Skip the first block, since we don't want to count the do the calling
* function found.
*/
for (block = (bblock_t *)block->link.next;
depth > 0;
inst = (fs_inst *)inst->next) {
switch (inst->opcode) {
case BRW_OPCODE_DO:
block = (bblock_t *)block->link.next) {
if (block->start->opcode == BRW_OPCODE_DO)
depth++;
break;
case BRW_OPCODE_WHILE:
if (block->end->opcode == BRW_OPCODE_WHILE) {
depth--;
break;
default:
break;
if (depth == 0)
return block->end_ip;
}
ip++;
}
return ip;
unreachable("not reached");
}
/**
@ -253,7 +254,7 @@ fs_visitor::setup_payload_interference(struct ra_graph *g,
* the end now.
*/
if (loop_depth == 1)
loop_end_ip = ip + count_to_loop_end(inst);
loop_end_ip = count_to_loop_end(block);
break;
case BRW_OPCODE_WHILE:
loop_depth--;