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Support store to load forwarding for different types of the same size

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This commit is contained in:
bjorn3 2019-12-30 21:26:49 +01:00
parent fd5efa0921
commit 790132523f
1 changed files with 12 additions and 10 deletions
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22
src/optimize/stack2reg.rs
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@ -79,9 +79,16 @@ impl StackSlotUsage {
fn change_load_to_alias(&mut self, func: &mut Function, load: Inst, value: Value) {
let loaded_value = func.dfg.inst_results(load)[0];
func.dfg.detach_results(load);
func.dfg.replace(load).nop();
func.dfg.change_to_alias(loaded_value, value);
let loaded_type = func.dfg.value_type(loaded_value);
if func.dfg.value_type(value) == loaded_type {
func.dfg.detach_results(load);
func.dfg.replace(load).nop();
func.dfg.change_to_alias(loaded_value, value);
} else {
func.dfg.replace(load).bitcast(loaded_type, value);
}
self.stack_load.remove(&load);
}
}
@ -159,7 +166,6 @@ pub(super) fn optimize_function(
}
for load in users.stack_load.clone().into_iter() {
let load_ebb = opt_ctx.ctx.func.layout.inst_ebb(load).unwrap();
let loaded_value = opt_ctx.ctx.func.dfg.inst_results(load)[0];
let loaded_type = opt_ctx.ctx.func.dfg.value_type(loaded_value);
@ -179,13 +185,9 @@ pub(super) fn optimize_function(
[] => println!("[{}] [BUG?] Reading uninitialized memory", name),
[store] if spatial_overlap(&opt_ctx.ctx.func, store, load) == SpatialOverlap::Full && temporal_order(&opt_ctx.ctx, store, load) == TemporalOrder::DefinitivelyBefore => {
// Only one store could have been the origin of the value.
let store_ebb = opt_ctx.ctx.func.layout.inst_ebb(store).unwrap();
let stored_value = opt_ctx.ctx.func.dfg.inst_args(store)[0];
let stored_type = opt_ctx.ctx.func.dfg.value_type(stored_value);
if stored_type == loaded_type {
println!("Store to load forward {} -> {}", store, load);
users.change_load_to_alias(&mut opt_ctx.ctx.func, load, stored_value);
}
println!("Store to load forward {} -> {}", store, load);
users.change_load_to_alias(&mut opt_ctx.ctx.func, load, stored_value);
}
_ => {} // FIXME implement this
}