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i965/vec4: Preparatory clean up of dead_code_eliminate().

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Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner
2014-03-11 13:04:26 -07:00
parent 10dd6eca89
commit 3a12f50f9c
1 changed files with 24 additions and 23 deletions
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47
src/mesa/drivers/dri/i965/brw_vec4.cpp
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@@ -322,7 +322,7 @@ src_reg::equals(src_reg *r)
}
/**
* Must be called after calculate_live_intervales() to remove unused
* Must be called after calculate_live_intervals() to remove unused
* writes to registers -- register allocation will fail otherwise
* because something deffed but not used won't be considered to
* interfere with other regs.
@@ -331,35 +331,36 @@ bool
vec4_visitor::dead_code_eliminate()
{
bool progress = false;
int pc = 0;
int pc = -1;
calculate_live_intervals();
foreach_list_safe(node, &this->instructions) {
vec4_instruction *inst = (vec4_instruction *)node;
if (inst->dst.file == GRF && !inst->has_side_effects()) {
assert(this->virtual_grf_end[inst->dst.reg] >= pc);
if (this->virtual_grf_end[inst->dst.reg] == pc) {
/* Don't dead code eliminate instructions that write to the
* accumulator as a side-effect. Instead just set the destination
* to the null register to free it.
*/
switch (inst->opcode) {
case BRW_OPCODE_ADDC:
case BRW_OPCODE_SUBB:
case BRW_OPCODE_MACH:
inst->dst = dst_reg(retype(brw_null_reg(), inst->dst.type));
break;
default:
inst->remove();
break;
}
progress = true;
}
}
pc++;
if (inst->dst.file != GRF || inst->has_side_effects())
continue;
assert(this->virtual_grf_end[inst->dst.reg] >= pc);
if (this->virtual_grf_end[inst->dst.reg] == pc) {
/* Don't dead code eliminate instructions that write to the
* accumulator as a side-effect. Instead just set the destination
* to the null register to free it.
*/
switch (inst->opcode) {
case BRW_OPCODE_ADDC:
case BRW_OPCODE_SUBB:
case BRW_OPCODE_MACH:
inst->dst = dst_reg(retype(brw_null_reg(), inst->dst.type));
break;
default:
inst->remove();
break;
}
progress = true;
}
}
if (progress)