1 files changed, 75 insertions, 0 deletions
diff --git a/src-self-hosted/value.zig b/src-self-hosted/value.zig
index e71805dc5b..b2fad9207d 100644
--- a/src-self-hosted/value.zig
+++ b/src-self-hosted/value.zig
@@ -568,6 +568,81 @@ pub const Value = extern union {
         }
     }
 
+    /// Asserts the value is an integer and it fits in a i64
+    pub fn toSignedInt(self: Value) i64 {
+        switch (self.tag()) {
+            .ty,
+            .int_type,
+            .u8_type,
+            .i8_type,
+            .u16_type,
+            .i16_type,
+            .u32_type,
+            .i32_type,
+            .u64_type,
+            .i64_type,
+            .usize_type,
+            .isize_type,
+            .c_short_type,
+            .c_ushort_type,
+            .c_int_type,
+            .c_uint_type,
+            .c_long_type,
+            .c_ulong_type,
+            .c_longlong_type,
+            .c_ulonglong_type,
+            .c_longdouble_type,
+            .f16_type,
+            .f32_type,
+            .f64_type,
+            .f128_type,
+            .c_void_type,
+            .bool_type,
+            .void_type,
+            .type_type,
+            .anyerror_type,
+            .comptime_int_type,
+            .comptime_float_type,
+            .noreturn_type,
+            .null_type,
+            .undefined_type,
+            .fn_noreturn_no_args_type,
+            .fn_void_no_args_type,
+            .fn_naked_noreturn_no_args_type,
+            .fn_ccc_void_no_args_type,
+            .single_const_pointer_to_comptime_int_type,
+            .const_slice_u8_type,
+            .null_value,
+            .function,
+            .ref_val,
+            .decl_ref,
+            .elem_ptr,
+            .bytes,
+            .repeated,
+            .float_16,
+            .float_32,
+            .float_64,
+            .float_128,
+            .void_value,
+            .unreachable_value,
+            .empty_array,
+            => unreachable,
+
+            .undef => unreachable,
+
+            .zero,
+            .bool_false,
+            => return 0,
+
+            .bool_true => return 1,
+
+            .int_u64 => return @intCast(i64, self.cast(Payload.Int_i64).?.int),
+            .int_i64 => return self.cast(Payload.Int_i64).?.int,
+            .int_big_positive => return self.cast(Payload.IntBigPositive).?.asBigInt().to(i64) catch unreachable,
+            .int_big_negative => return self.cast(Payload.IntBigNegative).?.asBigInt().to(i64) catch unreachable,
+        }
+    }
+
     pub fn toBool(self: Value) bool {
         return switch (self.tag()) {
             .bool_true => true,