279 lines
9.2 KiB
Rust
279 lines
9.2 KiB
Rust
use std::collections::HashMap;
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use crate::cdsl::instructions::InstructionPredicate;
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use crate::cdsl::recipes::{EncodingRecipeBuilder, EncodingRecipeNumber, Recipes, Stack};
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use crate::cdsl::regs::IsaRegs;
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use crate::shared::Definitions as SharedDefinitions;
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/// An helper to create recipes and use them when defining the RISCV encodings.
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pub(crate) struct RecipeGroup {
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/// The actualy list of recipes explicitly created in this file.
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pub recipes: Recipes,
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/// Provides fast lookup from a name to an encoding recipe.
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name_to_recipe: HashMap<String, EncodingRecipeNumber>,
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}
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impl RecipeGroup {
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fn new() -> Self {
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Self {
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recipes: Recipes::new(),
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name_to_recipe: HashMap::new(),
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}
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}
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fn push(&mut self, builder: EncodingRecipeBuilder) {
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assert!(
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self.name_to_recipe.get(&builder.name).is_none(),
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format!("riscv recipe '{}' created twice", builder.name)
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);
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let name = builder.name.clone();
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let number = self.recipes.push(builder.build());
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self.name_to_recipe.insert(name, number);
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}
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pub fn by_name(&self, name: &str) -> EncodingRecipeNumber {
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*self
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.name_to_recipe
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.get(name)
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.unwrap_or_else(|| panic!("unknown riscv recipe name {}", name))
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}
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pub fn collect(self) -> Recipes {
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self.recipes
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}
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}
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pub(crate) fn define(shared_defs: &SharedDefinitions, regs: &IsaRegs) -> RecipeGroup {
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let formats = &shared_defs.formats;
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// Register classes shorthands.
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let gpr = regs.class_by_name("GPR");
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// Definitions.
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let mut recipes = RecipeGroup::new();
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// R-type 32-bit instructions: These are mostly binary arithmetic instructions.
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// The encbits are `opcode[6:2] | (funct3 << 5) | (funct7 << 8)
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recipes.push(
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EncodingRecipeBuilder::new("R", &formats.binary, 4)
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.operands_in(vec![gpr, gpr])
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.operands_out(vec![gpr])
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.emit("put_r(bits, in_reg0, in_reg1, out_reg0, sink);"),
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);
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// R-type with an immediate shift amount instead of rs2.
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recipes.push(
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EncodingRecipeBuilder::new("Rshamt", &formats.binary_imm, 4)
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.operands_in(vec![gpr])
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.operands_out(vec![gpr])
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.emit("put_rshamt(bits, in_reg0, imm.into(), out_reg0, sink);"),
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);
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// R-type encoding of an integer comparison.
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recipes.push(
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EncodingRecipeBuilder::new("Ricmp", &formats.int_compare, 4)
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.operands_in(vec![gpr, gpr])
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.operands_out(vec![gpr])
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.emit("put_r(bits, in_reg0, in_reg1, out_reg0, sink);"),
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);
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recipes.push(
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EncodingRecipeBuilder::new("Ii", &formats.binary_imm, 4)
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.operands_in(vec![gpr])
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.operands_out(vec![gpr])
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.inst_predicate(InstructionPredicate::new_is_signed_int(
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&*formats.binary_imm,
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"imm",
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12,
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0,
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))
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.emit("put_i(bits, in_reg0, imm.into(), out_reg0, sink);"),
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);
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// I-type instruction with a hardcoded %x0 rs1.
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recipes.push(
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EncodingRecipeBuilder::new("Iz", &formats.unary_imm, 4)
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.operands_out(vec![gpr])
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.inst_predicate(InstructionPredicate::new_is_signed_int(
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&formats.unary_imm,
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"imm",
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12,
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0,
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))
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.emit("put_i(bits, 0, imm.into(), out_reg0, sink);"),
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);
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// I-type encoding of an integer comparison.
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recipes.push(
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EncodingRecipeBuilder::new("Iicmp", &formats.int_compare_imm, 4)
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.operands_in(vec![gpr])
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.operands_out(vec![gpr])
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.inst_predicate(InstructionPredicate::new_is_signed_int(
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&formats.int_compare_imm,
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"imm",
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12,
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0,
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))
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.emit("put_i(bits, in_reg0, imm.into(), out_reg0, sink);"),
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);
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// I-type encoding for `jalr` as a return instruction. We won't use the immediate offset. The
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// variable return values are not encoded.
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recipes.push(
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EncodingRecipeBuilder::new("Iret", &formats.multiary, 4).emit(
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r#"
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// Return instructions are always a jalr to %x1.
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// The return address is provided as a special-purpose link argument.
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put_i(
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bits,
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1, // rs1 = %x1
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0, // no offset.
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0, // rd = %x0: no address written.
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sink,
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);
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"#,
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),
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);
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// I-type encoding for `jalr` as a call_indirect.
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recipes.push(
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EncodingRecipeBuilder::new("Icall", &formats.call_indirect, 4)
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.operands_in(vec![gpr])
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.emit(
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r#"
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// call_indirect instructions are jalr with rd=%x1.
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put_i(
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bits,
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in_reg0,
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0, // no offset.
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1, // rd = %x1: link register.
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sink,
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);
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"#,
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),
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);
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// Copy of a GPR is implemented as addi x, 0.
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recipes.push(
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EncodingRecipeBuilder::new("Icopy", &formats.unary, 4)
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.operands_in(vec![gpr])
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.operands_out(vec![gpr])
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.emit("put_i(bits, in_reg0, 0, out_reg0, sink);"),
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);
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// Same for a GPR regmove.
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recipes.push(
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EncodingRecipeBuilder::new("Irmov", &formats.reg_move, 4)
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.operands_in(vec![gpr])
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.emit("put_i(bits, src, 0, dst, sink);"),
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);
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// Same for copy-to-SSA -- GPR regmove.
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recipes.push(
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EncodingRecipeBuilder::new("copytossa", &formats.copy_to_ssa, 4)
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// No operands_in to mention, because a source register is specified directly.
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.operands_out(vec![gpr])
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.emit("put_i(bits, src, 0, out_reg0, sink);"),
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);
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// U-type instructions have a 20-bit immediate that targets bits 12-31.
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recipes.push(
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EncodingRecipeBuilder::new("U", &formats.unary_imm, 4)
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.operands_out(vec![gpr])
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.inst_predicate(InstructionPredicate::new_is_signed_int(
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&formats.unary_imm,
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"imm",
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32,
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12,
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))
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.emit("put_u(bits, imm.into(), out_reg0, sink);"),
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);
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// UJ-type unconditional branch instructions.
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recipes.push(
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EncodingRecipeBuilder::new("UJ", &formats.jump, 4)
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.branch_range((0, 21))
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.emit(
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r#"
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let dest = i64::from(func.offsets[destination]);
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let disp = dest - i64::from(sink.offset());
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put_uj(bits, disp, 0, sink);
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"#,
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),
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);
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recipes.push(EncodingRecipeBuilder::new("UJcall", &formats.call, 4).emit(
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r#"
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sink.reloc_external(Reloc::RiscvCall,
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&func.dfg.ext_funcs[func_ref].name,
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0);
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// rd=%x1 is the standard link register.
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put_uj(bits, 0, 1, sink);
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"#,
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));
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// SB-type branch instructions.
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recipes.push(
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EncodingRecipeBuilder::new("SB", &formats.branch_icmp, 4)
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.operands_in(vec![gpr, gpr])
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.branch_range((0, 13))
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.emit(
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r#"
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let dest = i64::from(func.offsets[destination]);
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let disp = dest - i64::from(sink.offset());
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put_sb(bits, disp, in_reg0, in_reg1, sink);
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"#,
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),
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);
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// SB-type branch instruction with rs2 fixed to zero.
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recipes.push(
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EncodingRecipeBuilder::new("SBzero", &formats.branch, 4)
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.operands_in(vec![gpr])
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.branch_range((0, 13))
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.emit(
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r#"
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let dest = i64::from(func.offsets[destination]);
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let disp = dest - i64::from(sink.offset());
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put_sb(bits, disp, in_reg0, 0, sink);
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"#,
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),
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);
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// Spill of a GPR.
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recipes.push(
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EncodingRecipeBuilder::new("GPsp", &formats.unary, 4)
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.operands_in(vec![gpr])
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.operands_out(vec![Stack::new(gpr)])
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.emit("unimplemented!();"),
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);
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// Fill of a GPR.
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recipes.push(
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EncodingRecipeBuilder::new("GPfi", &formats.unary, 4)
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.operands_in(vec![Stack::new(gpr)])
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.operands_out(vec![gpr])
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.emit("unimplemented!();"),
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);
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// Stack-slot to same stack-slot copy, which is guaranteed to turn into a no-op.
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recipes.push(
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EncodingRecipeBuilder::new("stacknull", &formats.unary, 0)
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.operands_in(vec![Stack::new(gpr)])
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.operands_out(vec![Stack::new(gpr)])
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.emit(""),
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);
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// No-op fills, created by late-stage redundant-fill removal.
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recipes.push(
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EncodingRecipeBuilder::new("fillnull", &formats.unary, 0)
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.operands_in(vec![Stack::new(gpr)])
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.operands_out(vec![gpr])
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.clobbers_flags(false)
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.emit(""),
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);
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recipes
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}
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