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i965: Be more conservative on live interval calculation. 

This also means that our intervals now highlight dead code.
This commit is contained in:
Eric Anholt 2010-10-03 15:01:20 -07:00
parent a0a8e24385
commit 9faf64bc32
1 changed files with 11 additions and 3 deletions
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14
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -2471,7 +2471,7 @@ fs_visitor::calculate_live_intervals()
for (int i = 0; i < num_vars; i++) {
def[i] = 1 << 30;
use[i] = 0;
use[i] = -1;
}
int ip = 0;
@ -2506,13 +2506,11 @@ fs_visitor::calculate_live_intervals()
for (unsigned int i = 0; i < 3; i++) {
if (inst->src[i].file == GRF && inst->src[i].reg != 0) {
def[inst->src[i].reg] = MIN2(def[inst->src[i].reg], eip);
use[inst->src[i].reg] = MAX2(use[inst->src[i].reg], eip);
}
}
if (inst->dst.file == GRF && inst->dst.reg != 0) {
def[inst->dst.reg] = MIN2(def[inst->dst.reg], eip);
use[inst->dst.reg] = MAX2(use[inst->dst.reg], eip);
}
}
@ -2529,6 +2527,16 @@ fs_visitor::virtual_grf_interferes(int a, int b)
int start = MAX2(this->virtual_grf_def[a], this->virtual_grf_def[b]);
int end = MIN2(this->virtual_grf_use[a], this->virtual_grf_use[b]);
/* For dead code, just check if the def interferes with the other range. */
if (this->virtual_grf_use[a] == -1) {
return (this->virtual_grf_def[a] >= this->virtual_grf_def[b] &&
this->virtual_grf_def[a] < this->virtual_grf_use[b]);
}
if (this->virtual_grf_use[b] == -1) {
return (this->virtual_grf_def[b] >= this->virtual_grf_def[a] &&
this->virtual_grf_def[b] < this->virtual_grf_use[a]);
}
return start <= end;
}