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Basic ContextPromotionPass and some opcode info rearranging.

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This commit is contained in:
Ben Vanik
2013-12-07 04:39:48 -08:00
parent 51d0be0f0a
commit 329b554c7a
25 changed files with 907 additions and 617 deletions
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13
src/alloy/compiler/passes/dead_code_elimination_pass.cc
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@@ -53,8 +53,6 @@ int DeadCodeEliminationPass::Run(FunctionBuilder* builder) {
// all removed ops with NOP and then do a single pass that removes them
// all.
const OpcodeInfo* nop = builder->GetNopOpcode();
bool any_removed = false;
Block* block = builder->first_block();
while (block) {
@@ -67,7 +65,7 @@ int DeadCodeEliminationPass::Run(FunctionBuilder* builder) {
if (!(opcode->flags & OPCODE_FLAG_VOLATILE) &&
i->dest && !i->dest->use_head) {
// Has no uses and is not volatile. This instruction can die!
MakeNopRecursive(nop, i);
MakeNopRecursive(i);
any_removed = true;
}
@@ -84,7 +82,7 @@ int DeadCodeEliminationPass::Run(FunctionBuilder* builder) {
Instr* i = block->instr_head;
while (i) {
Instr* next = i->next;
if (i->opcode->num == OPCODE_NOP) {
if (i->opcode == &OPCODE_NOP_info) {
// Nop - remove!
i->Remove();
}
@@ -97,9 +95,8 @@ int DeadCodeEliminationPass::Run(FunctionBuilder* builder) {
return 0;
}
void DeadCodeEliminationPass::MakeNopRecursive(
const OpcodeInfo* nop, Instr* i) {
i->opcode = nop;
void DeadCodeEliminationPass::MakeNopRecursive(Instr* i) {
i->opcode = &hir::OPCODE_NOP_info;
i->dest->def = NULL;
i->dest = NULL;
@@ -113,7 +110,7 @@ void DeadCodeEliminationPass::MakeNopRecursive(
if (!value->use_head) { \
/* Value is now unused, so recursively kill it. */ \
if (value->def && value->def != i) { \
MakeNopRecursive(nop, value->def); \
MakeNopRecursive(value->def); \
} \
} \
}