forked from M-Labs/nac3
nac3core: fix powi with negative integer power
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@ -948,15 +948,12 @@ pub fn gen_binop_expr<'ctx, 'a, G: CodeGenerator>(
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} else if ty1 == ctx.primitives.float && ty2 == ctx.primitives.int32 {
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// Pow is the only operator that would pass typecheck between float and int
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assert!(*op == Operator::Pow);
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// TODO: throw exception when rhs is out of i16 bound
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// since llvm intrinsic only support to i16 for f64
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let i16_t = ctx.ctx.i16_type();
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let pow_intr = ctx.module.get_function("llvm.powi.f64.i16").unwrap_or_else(|| {
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let i32_t = ctx.ctx.i32_type();
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let pow_intr = ctx.module.get_function("llvm.powi.f64.i32").unwrap_or_else(|| {
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let f64_t = ctx.ctx.f64_type();
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let ty = f64_t.fn_type(&[f64_t.into(), i16_t.into()], false);
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ctx.module.add_function("llvm.powi.f64.i16", ty, None)
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let ty = f64_t.fn_type(&[f64_t.into(), i32_t.into()], false);
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ctx.module.add_function("llvm.powi.f64.i32", ty, None)
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});
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let right = ctx.builder.build_int_truncate(right.into_int_value(), i16_t, "r_pow");
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ctx.builder
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.build_call(pow_intr, &[left.into(), right.into()], "f_pow_i")
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.try_as_basic_value()
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