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divtf3_test.zig (2251B) - Raw

      1 const std = @import("std");
      2 const math = std.math;
      3 const testing = std.testing;
      4 
      5 const __divtf3 = @import("divtf3.zig").__divtf3;
      6 
      7 fn compareResultLD(result: f128, expectedHi: u64, expectedLo: u64) bool {
      8     const rep: u128 = @bitCast(result);
      9     const hi: u64 = @truncate(rep >> 64);
     10     const lo: u64 = @truncate(rep);
     11 
     12     if (hi == expectedHi and lo == expectedLo) {
     13         return true;
     14     }
     15     // test other possible NaN representation(signal NaN)
     16     else if (expectedHi == 0x7fff800000000000 and expectedLo == 0) {
     17         if ((hi & 0x7fff000000000000) == 0x7fff000000000000 and
     18             ((hi & 0xffffffffffff) > 0 or lo > 0))
     19         {
     20             return true;
     21         }
     22     }
     23     return false;
     24 }
     25 
     26 fn test__divtf3(a: f128, b: f128, expectedHi: u64, expectedLo: u64) !void {
     27     const x = __divtf3(a, b);
     28     const ret = compareResultLD(x, expectedHi, expectedLo);
     29     try testing.expect(ret == true);
     30 }
     31 
     32 test "divtf3" {
     33     // NaN / any = NaN
     34     try test__divtf3(math.nan(f128), 0x1.23456789abcdefp+5, 0x7fff800000000000, 0);
     35     // inf / any(except inf and nan) = inf
     36     try test__divtf3(math.inf(f128), 0x1.23456789abcdefp+5, 0x7fff000000000000, 0);
     37     // inf / inf = nan
     38     try test__divtf3(math.inf(f128), math.inf(f128), 0x7fff800000000000, 0);
     39     // inf / nan = nan
     40     try test__divtf3(math.inf(f128), math.nan(f128), 0x7fff800000000000, 0);
     41 
     42     try test__divtf3(0x1.a23b45362464523375893ab4cdefp+5, 0x1.eedcbaba3a94546558237654321fp-1, 0x4004b0b72924d407, 0x0717e84356c6eba2);
     43     try test__divtf3(0x1.a2b34c56d745382f9abf2c3dfeffp-50, 0x1.ed2c3ba15935332532287654321fp-9, 0x3fd5b2af3f828c9b, 0x40e51f64cde8b1f2);
     44     try test__divtf3(0x1.2345f6aaaa786555f42432abcdefp+456, 0x1.edacbba9874f765463544dd3621fp+6400, 0x28c62e15dc464466, 0xb5a07586348557ac);
     45     try test__divtf3(0x1.2d3456f789ba6322bc665544edefp-234, 0x1.eddcdba39f3c8b7a36564354321fp-4455, 0x507b38442b539266, 0x22ce0f1d024e1252);
     46     try test__divtf3(0x1.2345f6b77b7a8953365433abcdefp+234, 0x1.edcba987d6bb3aa467754354321fp-4055, 0x50bf2e02f0798d36, 0x5e6fcb6b60044078);
     47     try test__divtf3(6.72420628622418701252535563464350521E-4932, 2.0, 0x0001000000000000, 0);
     48     try test__divtf3(1.0, 0x1.ffffffffffffffffffffffffffffp-1, 0x3FFF000000000000, 1);
     49 }