From b5637a04e95dbb7ef2b37a0c1f1d37bfd44d1e1d Mon Sep 17 00:00:00 2001 From: ychenfo Date: Mon, 13 Dec 2021 04:02:30 +0800 Subject: [PATCH] nac3core: use official implementation for len --- nac3core/src/toplevel/builtins.rs | 97 +++++++++++++++++-------------- 1 file changed, 52 insertions(+), 45 deletions(-) diff --git a/nac3core/src/toplevel/builtins.rs b/nac3core/src/toplevel/builtins.rs index c2e5be4a..1bf24619 100644 --- a/nac3core/src/toplevel/builtins.rs +++ b/nac3core/src/toplevel/builtins.rs @@ -1,5 +1,5 @@ use std::cell::RefCell; -use inkwell::{IntPredicate, FloatPredicate, values::{BasicValueEnum, IntValue}}; +use inkwell::{IntPredicate::{self, *}, FloatPredicate, values::IntValue}; use crate::{symbol_resolver::SymbolValue, codegen::expr::destructure_range}; use super::*; @@ -570,7 +570,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo { ty: arg_ty.0, default_value: None }], - ret: int32, + ret: int64, vars: vec![(list_var.1, list_var.0), (arg_ty.1, arg_ty.0)].into_iter().collect(), }))), var_id: vec![arg_ty.1], @@ -582,13 +582,13 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo { let range_ty = ctx.primitives.range; let arg_ty = fun.0.args[0].ty; let arg = args[0].1; - let int32 = ctx.ctx.i32_type(); - let zero = int32.const_zero(); if ctx.unifier.unioned(arg_ty, range_ty) { let arg = arg.into_pointer_value(); let (start, end, step) = destructure_range(ctx, arg); Some(calculate_len_for_slice_range(ctx, start, end, step).into()) } else { + let int32 = ctx.ctx.i32_type(); + let zero = int32.const_zero(); Some(ctx.build_gep_and_load(arg.into_pointer_value(), &[zero, zero])) } }, @@ -621,67 +621,74 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo { // equivalent code: // def length(start, end, step != 0): // diff = end - start -// # if diff == 0 OR `diff` and `step` are of different signs, always zero -// if diff * step <= 0: -// return 0 +// if diff > 0 and step > 0: +// return ((diff - 1) // step) + 1 +// elif diff < 0 and step < 0: +// return ((diff + 1) // step) + 1 // else: -// return ((abs(diff) - 1) // abs(step)) + 1 +// return 0 pub fn calculate_len_for_slice_range<'ctx, 'a>( ctx: &mut CodeGenContext<'ctx, 'a>, start: IntValue<'ctx>, end: IntValue<'ctx>, step: IntValue<'ctx>, ) -> IntValue<'ctx> { - let int32 = ctx.ctx.i32_type(); - let int1 = ctx.ctx.bool_type(); - let falze = int1.const_int(0, false); - let abs_intrinsic = - ctx.module.get_function("llvm.abs.i32").unwrap_or_else(|| { - let fn_type = int32.fn_type(&[int32.into(), int1.into()], false); - ctx.module.add_function("llvm.abs.i32", fn_type, None) - }); + let int64 = ctx.ctx.i64_type(); + let start = ctx.builder.build_int_s_extend(start, int64, "start"); + let end = ctx.builder.build_int_s_extend(end, int64, "end"); + let step = ctx.builder.build_int_s_extend(step, int64, "step"); let diff = ctx.builder.build_int_sub(end, start, "diff"); - let test_mult = ctx.builder.build_int_mul(diff, step, "test_mult"); - let test = - ctx.builder.build_int_compare(inkwell::IntPredicate::SLE, test_mult, int32.const_zero(), "cmp"); + + let diff_pos = ctx.builder.build_int_compare(SGT, diff, int64.const_zero(), "diffpos"); + let step_pos = ctx.builder.build_int_compare(SGT, step, int64.const_zero(), "steppos"); + let test_1 = ctx.builder.build_and(diff_pos, step_pos, "bothpos"); + let current = ctx.builder.get_insert_block().unwrap().get_parent().unwrap(); let then_bb = ctx.ctx.append_basic_block(current, "then"); let else_bb = ctx.ctx.append_basic_block(current, "else"); + let then_bb_2 = ctx.ctx.append_basic_block(current, "then_2"); + let else_bb_2 = ctx.ctx.append_basic_block(current, "else_2"); + let cont_bb_2 = ctx.ctx.append_basic_block(current, "cont_2"); let cont_bb = ctx.ctx.append_basic_block(current, "cont"); - ctx.builder.build_conditional_branch(test, then_bb, else_bb); + ctx.builder.build_conditional_branch(test_1, then_bb, else_bb); ctx.builder.position_at_end(then_bb); - let length_zero = int32.const_zero(); + let length_pos = { + let diff_pos_min_1 = ctx.builder.build_int_sub(diff, int64.const_int(1, false), "diffminone"); + let length_pos = ctx.builder.build_int_signed_div(diff_pos_min_1, step, "div"); + ctx.builder.build_int_add(length_pos, int64.const_int(1, false), "add1") + }; ctx.builder.build_unconditional_branch(cont_bb); ctx.builder.position_at_end(else_bb); - let diff = if let BasicValueEnum::IntValue(val) = ctx - .builder - .build_call(abs_intrinsic, &[diff.into(), falze.into()], "absdiff") - .try_as_basic_value() - .left() - .unwrap() { - val - } else { - unreachable!(); + let phi_1 = { + let diff_neg = ctx.builder.build_int_compare(SLT, diff, int64.const_zero(), "diffneg"); + let step_neg = ctx.builder.build_int_compare(SLT, step, int64.const_zero(), "stepneg"); + let test_2 = ctx.builder.build_and(diff_neg, step_neg, "bothneg"); + + ctx.builder.build_conditional_branch(test_2, then_bb_2, else_bb_2); + + ctx.builder.position_at_end(then_bb_2); + let length_neg = { + let diff_neg_add_1 = ctx.builder.build_int_add(diff, int64.const_int(1, false), "diffminone"); + let length_neg = ctx.builder.build_int_signed_div(diff_neg_add_1, step, "div"); + ctx.builder.build_int_add(length_neg, int64.const_int(1, false), "add1") }; - let diff = ctx.builder.build_int_sub(diff, int32.const_int(1, false), "diff"); - let step = if let BasicValueEnum::IntValue(val) = ctx - .builder - .build_call(abs_intrinsic, &[step.into(), falze.into()], "absstep") - .try_as_basic_value() - .left() - .unwrap() { - val - } else { - unreachable!(); - }; - let length = ctx.builder.build_int_signed_div(diff, step, "div"); - let length = ctx.builder.build_int_add(length, int32.const_int(1, false), "add1"); + ctx.builder.build_unconditional_branch(cont_bb_2); + + ctx.builder.position_at_end(else_bb_2); + let length_zero = int64.const_zero(); + ctx.builder.build_unconditional_branch(cont_bb_2); + + ctx.builder.position_at_end(cont_bb_2); + let phi_1 = ctx.builder.build_phi(int64, "lenphi1"); + phi_1.add_incoming(&[(&length_neg, then_bb_2), (&length_zero, else_bb_2)]); + phi_1.as_basic_value().into_int_value() + }; ctx.builder.build_unconditional_branch(cont_bb); ctx.builder.position_at_end(cont_bb); - let phi = ctx.builder.build_phi(length_zero.get_type(), "lenphi"); - phi.add_incoming(&[(&length_zero, then_bb), (&length, else_bb)]); + let phi = ctx.builder.build_phi(int64, "lenphi"); + phi.add_incoming(&[(&length_pos, then_bb), (&phi_1, cont_bb_2)]); phi.as_basic_value().into_int_value() } \ No newline at end of file