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Simplify the code in make_inst_results_reusing; NFC.

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This commit is contained in:
Dan Gohman
2018-02-20 12:15:23 -08:00
parent ad896d9790
commit 21215529fe
1 changed files with 18 additions and 19 deletions
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37
lib/cretonne/src/ir/dfg.rs
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@@ -452,29 +452,15 @@ impl DataFlowGraph {
I: Iterator<Item = Option<Value>>,
{
let mut reuse = reuse.fuse();
let constraints = self.insts[inst].opcode().constraints();
let fixed_results = constraints.fixed_results();
let mut total_results = fixed_results;
self.results[inst].clear(&mut self.value_lists);
// The fixed results will appear at the front of the list.
for res_idx in 0..fixed_results {
let ty = constraints.result_type(res_idx, ctrl_typevar);
if let Some(Some(v)) = reuse.next() {
debug_assert_eq!(self.value_type(v), ty, "Reused {} is wrong type", ty);
self.attach_result(inst, v);
} else {
self.append_result(inst, ty);
}
}
// Get the call signature if this is a function call.
if let Some(sig) = self.call_signature(inst) {
// Create result values corresponding to the call return types.
let var_results = self.signatures[sig].returns.len();
total_results += var_results;
for res_idx in 0..var_results {
debug_assert_eq!(self.insts[inst].opcode().constraints().fixed_results(), 0);
let num_results = self.signatures[sig].returns.len();
for res_idx in 0..num_results {
let ty = self.signatures[sig].returns[res_idx].value_type;
if let Some(Some(v)) = reuse.next() {
debug_assert_eq!(self.value_type(v), ty, "Reused {} is wrong type", ty);
@@ -483,9 +469,22 @@ impl DataFlowGraph {
self.append_result(inst, ty);
}
}
num_results
} else {
// Create result values corresponding to the opcode's constraints.
let constraints = self.insts[inst].opcode().constraints();
let num_results = constraints.fixed_results();
for res_idx in 0..num_results {
let ty = constraints.result_type(res_idx, ctrl_typevar);
if let Some(Some(v)) = reuse.next() {
debug_assert_eq!(self.value_type(v), ty, "Reused {} is wrong type", ty);
self.attach_result(inst, v);
} else {
self.append_result(inst, ty);
}
}
num_results
}
total_results
}
/// Create a `ReplaceBuilder` that will replace `inst` with a new instruction in place.