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subvdi3.zig (932B) - 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(&__subvdi3, .{ .name = "__subvdi3", .linkage = common.linkage, .visibility = common.visibility });
      9 }
     10 
     11 pub fn __subvdi3(a: i64, b: i64) callconv(.c) i64 {
     12     var overflow: c_int = 0;
     13     const sum = subv.__subodi4(a, b, &overflow);
     14     if (overflow != 0) @panic("compiler-rt: integer overflow");
     15     return sum;
     16 }
     17 
     18 test "subvdi3" {
     19     // min i64 = -9223372036854775808
     20     // max i64 = 9223372036854775807
     21     // TODO write panic handler for testing panics
     22     // try test__subvdi3(-9223372036854775808, -1, -1); // panic
     23     // try test__addvdi3(9223372036854775807, 1, 1);  // panic
     24     try testing.expectEqual(-9223372036854775808, __subvdi3(-9223372036854775807, 1));
     25     try testing.expectEqual(9223372036854775807, __subvdi3(9223372036854775806, -1));
     26 }