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i965/fs: Skip blocks in register coalescing interference check.

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No need to walk through instructions in blocks we know don't contain our
registers' live ranges.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2015-08-18 17:47:00 -07:00
parent f2f8c43af9
commit a2ff1e95a4
1 changed files with 20 additions and 14 deletions
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34
src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
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@ -115,25 +115,31 @@ can_coalesce_vars(brw::fs_live_variables *live_intervals,
*/
int start_ip = MAX2(start_to, start_from);
int end_ip = MIN2(end_to, end_from);
int scan_ip = -1;
foreach_block_and_inst(block, fs_inst, scan_inst, cfg) {
scan_ip++;
/* Ignore anything before the intersection of the live ranges */
if (scan_ip < start_ip)
foreach_block(block, cfg) {
if (block->end_ip < start_ip)
continue;
/* Ignore the copying instruction itself */
if (scan_inst == inst)
continue;
int scan_ip = block->start_ip - 1;
if (scan_ip > end_ip)
return true; /* registers do not interfere */
foreach_inst_in_block(fs_inst, scan_inst, block) {
scan_ip++;
if (scan_inst->overwrites_reg(inst->dst) ||
scan_inst->overwrites_reg(inst->src[0]))
return false; /* registers interfere */
/* Ignore anything before the intersection of the live ranges */
if (scan_ip < start_ip)
continue;
/* Ignore the copying instruction itself */
if (scan_inst == inst)
continue;
if (scan_ip > end_ip)
return true; /* registers do not interfere */
if (scan_inst->overwrites_reg(inst->dst) ||
scan_inst->overwrites_reg(inst->src[0]))
return false; /* registers interfere */
}
}
return true;