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nac3core: fix powi with negative integer power

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This commit is contained in:
ychenfo 2022-04-02 03:26:15 +08:00
parent 4bf452ec5a
commit 710904f975
1 changed files with 4 additions and 7 deletions
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11
nac3core/src/codegen/expr.rs
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@ -948,15 +948,12 @@ pub fn gen_binop_expr<'ctx, 'a, G: CodeGenerator>(
} else if ty1 == ctx.primitives.float && ty2 == ctx.primitives.int32 {
// Pow is the only operator that would pass typecheck between float and int
assert!(*op == Operator::Pow);
// TODO: throw exception when rhs is out of i16 bound
// since llvm intrinsic only support to i16 for f64
let i16_t = ctx.ctx.i16_type();
let pow_intr = ctx.module.get_function("llvm.powi.f64.i16").unwrap_or_else(|| {
let i32_t = ctx.ctx.i32_type();
let pow_intr = ctx.module.get_function("llvm.powi.f64.i32").unwrap_or_else(|| {
let f64_t = ctx.ctx.f64_type();
let ty = f64_t.fn_type(&[f64_t.into(), i16_t.into()], false);
ctx.module.add_function("llvm.powi.f64.i16", ty, None)
let ty = f64_t.fn_type(&[f64_t.into(), i32_t.into()], false);
ctx.module.add_function("llvm.powi.f64.i32", ty, None)
});
let right = ctx.builder.build_int_truncate(right.into_int_value(), i16_t, "r_pow");
ctx.builder
.build_call(pow_intr, &[left.into(), right.into()], "f_pow_i")
.try_as_basic_value()