forked from M-Labs/nac3
49 lines
1.8 KiB
Rust
49 lines
1.8 KiB
Rust
use super::CodeGenContext;
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use inkwell::{
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context::Context,
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attributes::AttributeLoc,
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memory_buffer::MemoryBuffer,
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module::Module,
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values::IntValue,
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};
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pub fn load_irrt<'ctx>(ctx: &'ctx Context) -> Module<'ctx> {
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let bitcode_buf = MemoryBuffer::create_from_memory_range(
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include_bytes!(concat!(env!("OUT_DIR"), "/irrt.bc")),
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"irrt_bitcode_buffer",
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);
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let irrt_mod = Module::parse_bitcode_from_buffer(&bitcode_buf, ctx).unwrap();
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// add alwaysinline attributes to power function to help them get inlined
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// alwaysinline enum = 1, see release/13.x/llvm/include/llvm/IR/Attributes.td
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for symbol in &["__nac3_irrt_int_exp_int32_t", "__nac3_irrt_int_exp_int64_t"] {
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let function = irrt_mod.get_function(symbol).unwrap();
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function.add_attribute(AttributeLoc::Function, ctx.create_enum_attribute(1, 0));
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}
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return irrt_mod;
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}
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// repeated squaring method adapted from GNU Scientific Library:
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// https://git.savannah.gnu.org/cgit/gsl.git/tree/sys/pow_int.c
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pub fn integer_power<'ctx, 'a>(
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ctx: &mut CodeGenContext<'ctx, 'a>,
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base: IntValue<'ctx>,
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exp: IntValue<'ctx>,
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) -> IntValue<'ctx> {
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let symbol = match (base.get_type().get_bit_width(), exp.get_type().get_bit_width()) {
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(32, 32) => "__nac3_irrt_int_exp_int32_t",
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(64, 64) => "__nac3_irrt_int_exp_int64_t",
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_ => unreachable!(),
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};
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let base_type = base.get_type();
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let pow_fun = ctx.module.get_function(symbol).unwrap_or_else(|| {
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let fn_type = base_type.fn_type(&[base_type.into(), base_type.into()], false);
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ctx.module.add_function(symbol, fn_type, None)
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});
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// TODO: throw exception when exp < 0
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ctx.builder
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.build_call(pow_fun, &[base.into(), exp.into()], "call_int_pow")
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.try_as_basic_value()
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.unwrap_left()
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.into_int_value()
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}
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