zig

fork of https://codeberg.org/ziglang/zig
Log | Files | Refs | README | LICENSE

subvsi3.zig (860B) - Raw

      1 const subv = @import("subo.zig");
      2 const common = @import("./common.zig");
      3 const testing = @import("std").testing;
      4 
      5 pub const panic = common.panic;
      6 
      7 comptime {
      8     @export(&__subvsi3, .{ .name = "__subvsi3", .linkage = common.linkage, .visibility = common.visibility });
      9 }
     10 
     11 pub fn __subvsi3(a: i32, b: i32) callconv(.c) i32 {
     12     var overflow: c_int = 0;
     13     const sum = subv.__subosi4(a, b, &overflow);
     14     if (overflow != 0) @panic("compiler-rt: integer overflow");
     15     return sum;
     16 }
     17 
     18 test "subvsi3" {
     19     // min i32 = -2147483648
     20     // max i32 = 2147483647
     21     // TODO write panic handler for testing panics
     22     // try test__subvsi3(-2147483648, -1, -1); // panic
     23     // try test__subvsi3(2147483647, 1, 1);  // panic
     24     try testing.expectEqual(-2147483648, __subvsi3(-2147483647, 1));
     25     try testing.expectEqual(2147483647, __subvsi3(2147483646, -1));
     26 }