nac3/nac3core/src/codegen/irrt/mod.rs

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