fabi/Xenia-Canary
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

(air quotes) "register allocation" without spills.

Browse Source
This commit is contained in:
Ben Vanik
2014-01-25 23:36:59 -08:00
parent c4d6c7a526
commit c74f35552a
7 changed files with 177 additions and 119 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
src/alloy/compiler/passes/value_reduction_pass.cc
View File

@@ -32,6 +32,9 @@ ValueReductionPass::~ValueReductionPass() {
}
void ValueReductionPass::ComputeLastUse(Value* value) {
// TODO(benvanik): compute during construction?
// Note that this list isn't sorted (unfortunately), so we have to scan
// them all.
uint32_t max_ordinal = 0;
Value::Use* last_use = NULL;
auto use = value->use_head;
@@ -42,7 +45,7 @@ void ValueReductionPass::ComputeLastUse(Value* value) {
}
use = use->next;
}
value->tag = last_use->instr;
value->last_use = last_use->instr;
}
int ValueReductionPass::Run(HIRBuilder* builder) {
@@ -73,30 +76,30 @@ int ValueReductionPass::Run(HIRBuilder* builder) {
OpcodeSignatureType src3_type = GET_OPCODE_SIG_TYPE_SRC3(info->signature);
if (src1_type == OPCODE_SIG_TYPE_V && !instr->src1.value->IsConstant()) {
auto v = instr->src1.value;
if (!v->tag) {
if (!v->last_use) {
ComputeLastUse(v);
}
if (v->tag == instr) {
if (v->last_use == instr) {
// Available.
ordinals.set(v->ordinal, false);
}
}
if (src2_type == OPCODE_SIG_TYPE_V && !instr->src2.value->IsConstant()) {
auto v = instr->src2.value;
if (!v->tag) {
if (!v->last_use) {
ComputeLastUse(v);
}
if (v->tag == instr) {
if (v->last_use == instr) {
// Available.
ordinals.set(v->ordinal, false);
}
}
if (src3_type == OPCODE_SIG_TYPE_V && !instr->src3.value->IsConstant()) {
auto v = instr->src3.value;
if (!v->tag) {
if (!v->last_use) {
ComputeLastUse(v);
}
if (v->tag == instr) {
if (v->last_use == instr) {
// Available.
ordinals.set(v->ordinal, false);
}