Function const_int_value

crates/rustc_codegen_spirv/src/abi.rs:861–874

(
                cx: &CodegenCx<'tcx>,
                const_: Const<'tcx>,
            )

            //     type_from_variant_discriminant(cx, substs.const_at(6));

            fn const_int_value<'tcx, P: FromPrimitive>(
                cx: &CodegenCx<'tcx>,
                const_: Const<'tcx>,
            ) -> Result<P, ErrorGuaranteed> {
                assert!(const_.ty().is_integral());
                let value = const_.eval_bits(cx.tcx, ParamEnv::reveal_all(), const_.ty());
                match P::from_u128(value) {
                    Some(v) => Ok(v),
                    None => Err(cx
                        .tcx
                        .sess
                        .err(format!("Invalid value for Image const generic: {value}"))),
                }
            }

            let dim = const_int_value(cx, substs.const_at(1))?;
            let depth = const_int_value(cx, substs.const_at(2))?;