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cranelift: Rework block instructions to use BlockCall (#5464)

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Add a new type BlockCall that represents the pair of a block name with arguments to be passed to it. (The mnemonic here is that it looks a bit like a function call.) Rework the implementation of jump, brz, and brnz to use BlockCall instead of storing the block arguments as varargs in the instruction's ValueList.

To ensure that we're processing block arguments from BlockCall values in instructions, three new functions have been introduced on DataFlowGraph that both sets of arguments:

inst_values - returns an iterator that traverses values in the instruction and block arguments
map_inst_values - applies a function to each value in the instruction and block arguments
overwrite_inst_values - overwrite all values in an instruction and block arguments with values from the iterator

Co-authored-by: Jamey Sharp <jamey@minilop.net>
This commit is contained in:
Trevor Elliott
2023-01-17 16:31:15 -08:00
committed by GitHub
parent 3a2ca67570
commit 1e6c13d83e
32 changed files with 475 additions and 422 deletions
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17
cranelift/codegen/src/egraph.rs
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@@ -408,12 +408,12 @@ impl<'a> EgraphPass<'a> {
// Rewrite args of *all* instructions using the
// value-to-opt-value map.
cursor.func.dfg.resolve_aliases_in_arguments(inst);
for arg in cursor.func.dfg.inst_args_mut(inst) {
let new_value = value_to_opt_value[*arg];
cursor.func.dfg.map_inst_values(inst, |_, arg| {
let new_value = value_to_opt_value[arg];
trace!("rewriting arg {} of inst {} to {}", arg, inst, new_value);
debug_assert_ne!(new_value, Value::reserved_value());
*arg = new_value;
}
new_value
});
// Build a context for optimization, with borrows of
// state. We can't invoke a method on `self` because
@@ -497,8 +497,10 @@ impl<'a> EgraphPass<'a> {
// layout.
for block in self.func.layout.blocks() {
for inst in self.func.layout.block_insts(block) {
for &arg in self.func.dfg.inst_args(inst) {
match self.func.dfg.value_def(arg) {
self.func
.dfg
.inst_values(inst)
.for_each(|arg| match self.func.dfg.value_def(arg) {
ValueDef::Result(i, _) => {
debug_assert!(self.func.layout.inst_block(i).is_some());
}
@@ -506,8 +508,7 @@ impl<'a> EgraphPass<'a> {
panic!("egraph union node {} still reachable at {}!", arg, inst);
}
_ => {}
}
}
})
}
}
}