forked from M-Labs/nac3
nac3core: use official implementation for len
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Gitea
parent
2c6601d97c
commit
b5637a04e9
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@ -1,5 +1,5 @@
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use std::cell::RefCell;
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use inkwell::{IntPredicate, FloatPredicate, values::{BasicValueEnum, IntValue}};
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use inkwell::{IntPredicate::{self, *}, FloatPredicate, values::IntValue};
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use crate::{symbol_resolver::SymbolValue, codegen::expr::destructure_range};
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use super::*;
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@ -570,7 +570,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
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ty: arg_ty.0,
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default_value: None
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}],
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ret: int32,
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ret: int64,
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vars: vec![(list_var.1, list_var.0), (arg_ty.1, arg_ty.0)].into_iter().collect(),
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}))),
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var_id: vec![arg_ty.1],
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@ -582,13 +582,13 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
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let range_ty = ctx.primitives.range;
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let arg_ty = fun.0.args[0].ty;
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let arg = args[0].1;
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let int32 = ctx.ctx.i32_type();
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let zero = int32.const_zero();
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if ctx.unifier.unioned(arg_ty, range_ty) {
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let arg = arg.into_pointer_value();
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let (start, end, step) = destructure_range(ctx, arg);
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Some(calculate_len_for_slice_range(ctx, start, end, step).into())
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} else {
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let int32 = ctx.ctx.i32_type();
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let zero = int32.const_zero();
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Some(ctx.build_gep_and_load(arg.into_pointer_value(), &[zero, zero]))
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}
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},
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@ -621,67 +621,74 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
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// equivalent code:
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// def length(start, end, step != 0):
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// diff = end - start
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// # if diff == 0 OR `diff` and `step` are of different signs, always zero
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// if diff * step <= 0:
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// return 0
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// if diff > 0 and step > 0:
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// return ((diff - 1) // step) + 1
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// elif diff < 0 and step < 0:
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// return ((diff + 1) // step) + 1
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// else:
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// return ((abs(diff) - 1) // abs(step)) + 1
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// return 0
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pub fn calculate_len_for_slice_range<'ctx, 'a>(
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ctx: &mut CodeGenContext<'ctx, 'a>,
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start: IntValue<'ctx>,
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end: IntValue<'ctx>,
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step: IntValue<'ctx>,
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) -> IntValue<'ctx> {
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let int32 = ctx.ctx.i32_type();
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let int1 = ctx.ctx.bool_type();
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let falze = int1.const_int(0, false);
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let abs_intrinsic =
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ctx.module.get_function("llvm.abs.i32").unwrap_or_else(|| {
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let fn_type = int32.fn_type(&[int32.into(), int1.into()], false);
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ctx.module.add_function("llvm.abs.i32", fn_type, None)
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});
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let int64 = ctx.ctx.i64_type();
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let start = ctx.builder.build_int_s_extend(start, int64, "start");
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let end = ctx.builder.build_int_s_extend(end, int64, "end");
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let step = ctx.builder.build_int_s_extend(step, int64, "step");
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let diff = ctx.builder.build_int_sub(end, start, "diff");
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let test_mult = ctx.builder.build_int_mul(diff, step, "test_mult");
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let test =
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ctx.builder.build_int_compare(inkwell::IntPredicate::SLE, test_mult, int32.const_zero(), "cmp");
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let diff_pos = ctx.builder.build_int_compare(SGT, diff, int64.const_zero(), "diffpos");
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let step_pos = ctx.builder.build_int_compare(SGT, step, int64.const_zero(), "steppos");
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let test_1 = ctx.builder.build_and(diff_pos, step_pos, "bothpos");
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let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap();
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let then_bb = ctx.ctx.append_basic_block(current, "then");
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let else_bb = ctx.ctx.append_basic_block(current, "else");
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let then_bb_2 = ctx.ctx.append_basic_block(current, "then_2");
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let else_bb_2 = ctx.ctx.append_basic_block(current, "else_2");
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let cont_bb_2 = ctx.ctx.append_basic_block(current, "cont_2");
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let cont_bb = ctx.ctx.append_basic_block(current, "cont");
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ctx.builder.build_conditional_branch(test, then_bb, else_bb);
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ctx.builder.build_conditional_branch(test_1, then_bb, else_bb);
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ctx.builder.position_at_end(then_bb);
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let length_zero = int32.const_zero();
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let length_pos = {
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let diff_pos_min_1 = ctx.builder.build_int_sub(diff, int64.const_int(1, false), "diffminone");
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let length_pos = ctx.builder.build_int_signed_div(diff_pos_min_1, step, "div");
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ctx.builder.build_int_add(length_pos, int64.const_int(1, false), "add1")
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};
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ctx.builder.build_unconditional_branch(cont_bb);
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ctx.builder.position_at_end(else_bb);
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let diff = if let BasicValueEnum::IntValue(val) = ctx
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.builder
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.build_call(abs_intrinsic, &[diff.into(), falze.into()], "absdiff")
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.try_as_basic_value()
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.left()
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.unwrap() {
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val
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} else {
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unreachable!();
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let phi_1 = {
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let diff_neg = ctx.builder.build_int_compare(SLT, diff, int64.const_zero(), "diffneg");
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let step_neg = ctx.builder.build_int_compare(SLT, step, int64.const_zero(), "stepneg");
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let test_2 = ctx.builder.build_and(diff_neg, step_neg, "bothneg");
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ctx.builder.build_conditional_branch(test_2, then_bb_2, else_bb_2);
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ctx.builder.position_at_end(then_bb_2);
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let length_neg = {
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let diff_neg_add_1 = ctx.builder.build_int_add(diff, int64.const_int(1, false), "diffminone");
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let length_neg = ctx.builder.build_int_signed_div(diff_neg_add_1, step, "div");
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ctx.builder.build_int_add(length_neg, int64.const_int(1, false), "add1")
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};
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let diff = ctx.builder.build_int_sub(diff, int32.const_int(1, false), "diff");
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let step = if let BasicValueEnum::IntValue(val) = ctx
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.builder
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.build_call(abs_intrinsic, &[step.into(), falze.into()], "absstep")
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.try_as_basic_value()
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.left()
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.unwrap() {
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val
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} else {
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unreachable!();
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ctx.builder.build_unconditional_branch(cont_bb_2);
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ctx.builder.position_at_end(else_bb_2);
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let length_zero = int64.const_zero();
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ctx.builder.build_unconditional_branch(cont_bb_2);
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ctx.builder.position_at_end(cont_bb_2);
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let phi_1 = ctx.builder.build_phi(int64, "lenphi1");
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phi_1.add_incoming(&[(&length_neg, then_bb_2), (&length_zero, else_bb_2)]);
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phi_1.as_basic_value().into_int_value()
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};
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let length = ctx.builder.build_int_signed_div(diff, step, "div");
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let length = ctx.builder.build_int_add(length, int32.const_int(1, false), "add1");
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ctx.builder.build_unconditional_branch(cont_bb);
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ctx.builder.position_at_end(cont_bb);
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let phi = ctx.builder.build_phi(length_zero.get_type(), "lenphi");
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phi.add_incoming(&[(&length_zero, then_bb), (&length, else_bb)]);
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let phi = ctx.builder.build_phi(int64, "lenphi");
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phi.add_incoming(&[(&length_pos, then_bb), (&phi_1, cont_bb_2)]);
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phi.as_basic_value().into_int_value()
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}
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