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Rework br_table to use BlockCall (#5731)

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Rework br_table to use BlockCall, allowing us to avoid adding new nodes during ssa construction to hold block arguments. Additionally, many places where we previously matched on InstructionData to extract branch destinations can be replaced with a use of branch_destination or branch_destination_mut.
This commit is contained in:
Trevor Elliott
2023-02-16 09:23:27 -08:00
committed by GitHub
parent c3c16eb207
commit 80c147d9c0
26 changed files with 475 additions and 269 deletions
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39
cranelift/codegen/src/ir/function.rs
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@@ -6,9 +6,9 @@
use crate::entity::{PrimaryMap, SecondaryMap};
use crate::ir::{
self, Block, DataFlowGraph, DynamicStackSlot, DynamicStackSlotData, DynamicStackSlots,
DynamicType, ExtFuncData, FuncRef, GlobalValue, GlobalValueData, Inst, InstructionData,
JumpTable, JumpTableData, Layout, Opcode, SigRef, Signature, SourceLocs, StackSlot,
StackSlotData, StackSlots, Table, TableData, Type,
DynamicType, ExtFuncData, FuncRef, GlobalValue, GlobalValueData, Inst, JumpTable,
JumpTableData, Layout, Opcode, SigRef, Signature, SourceLocs, StackSlot, StackSlotData,
StackSlots, Table, TableData, Type,
};
use crate::isa::CallConv;
use crate::value_label::ValueLabelsRanges;
@@ -273,37 +273,10 @@ impl FunctionStencil {
/// Rewrite the branch destination to `new_dest` if the destination matches `old_dest`.
/// Does nothing if called with a non-jump or non-branch instruction.
pub fn rewrite_branch_destination(&mut self, inst: Inst, old_dest: Block, new_dest: Block) {
match &mut self.dfg.insts[inst] {
InstructionData::Jump {
destination: dest, ..
} => {
if dest.block(&self.dfg.value_lists) == old_dest {
dest.set_block(new_dest, &mut self.dfg.value_lists)
}
for dest in self.dfg.insts[inst].branch_destination_mut(&mut self.dfg.jump_tables) {
if dest.block(&self.dfg.value_lists) == old_dest {
dest.set_block(new_dest, &mut self.dfg.value_lists)
}
InstructionData::Brif {
blocks: [block_then, block_else],
..
} => {
if block_then.block(&self.dfg.value_lists) == old_dest {
block_then.set_block(new_dest, &mut self.dfg.value_lists);
}
if block_else.block(&self.dfg.value_lists) == old_dest {
block_else.set_block(new_dest, &mut self.dfg.value_lists);
}
}
InstructionData::BranchTable { table, .. } => {
for entry in self.dfg.jump_tables[*table].all_branches_mut() {
if *entry == old_dest {
*entry = new_dest;
}
}
}
inst => debug_assert!(!inst.opcode().is_branch()),
}
}