41 lines
1.5 KiB
Rust
41 lines
1.5 KiB
Rust
//! Expanding instructions as runtime library calls.
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use crate::ir;
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use crate::ir::{get_libcall_funcref, InstBuilder};
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use crate::isa::{CallConv, TargetIsa};
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use crate::legalizer::boundary::legalize_libcall_signature;
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use std::vec::Vec;
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/// Try to expand `inst` as a library call, returning true is successful.
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pub fn expand_as_libcall(inst: ir::Inst, func: &mut ir::Function, isa: &dyn TargetIsa) -> bool {
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// Does the opcode/ctrl_type combo even have a well-known runtime library name.
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let libcall = match ir::LibCall::for_inst(func.dfg[inst].opcode(), func.dfg.ctrl_typevar(inst))
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{
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Some(lc) => lc,
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None => return false,
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};
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// Now we convert `inst` to a call. First save the arguments.
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let mut args = Vec::new();
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args.extend_from_slice(func.dfg.inst_args(inst));
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let call_conv = CallConv::for_libcall(isa);
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if call_conv.extends_baldrdash() {
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let vmctx = func
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.special_param(ir::ArgumentPurpose::VMContext)
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.expect("Missing vmctx parameter for baldrdash libcall");
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args.push(vmctx);
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}
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// The replace builder will preserve the instruction result values.
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let funcref = get_libcall_funcref(libcall, call_conv, func, inst, isa);
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func.dfg.replace(inst).call(funcref, &args);
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// Ask the ISA to legalize the signature.
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let fn_data = &func.dfg.ext_funcs[funcref];
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let sig_data = &mut func.dfg.signatures[fn_data.signature];
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legalize_libcall_signature(sig_data, isa);
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true
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}
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