87 lines
2.7 KiB
Zig
87 lines
2.7 KiB
Zig
// Ported from:
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//
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// https://github.com/llvm/llvm-project/blob/2ffb1b0413efa9a24eb3c49e710e36f92e2cb50b/compiler-rt/test/builtins/Unit/multf3_test.c
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const qnan128 = @bitCast(f128, @as(u128, 0x7fff800000000000) << 64);
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const inf128 = @bitCast(f128, @as(u128, 0x7fff000000000000) << 64);
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const __multf3 = @import("mulXf3.zig").__multf3;
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// return true if equal
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// use two 64-bit integers intead of one 128-bit integer
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// because 128-bit integer constant can't be assigned directly
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fn compareResultLD(result: f128, expectedHi: u64, expectedLo: u64) bool {
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const rep = @bitCast(u128, result);
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const hi = @intCast(u64, rep >> 64);
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const lo = @truncate(u64, rep);
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if (hi == expectedHi and lo == expectedLo) {
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return true;
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}
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// test other possible NaN representation(signal NaN)
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if (expectedHi == 0x7fff800000000000 and expectedLo == 0x0) {
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if ((hi & 0x7fff000000000000) == 0x7fff000000000000 and
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((hi & 0xffffffffffff) > 0 or lo > 0))
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{
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return true;
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}
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}
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return false;
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}
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fn test__multf3(a: f128, b: f128, expected_hi: u64, expected_lo: u64) void {
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const x = __multf3(a, b);
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if (compareResultLD(x, expected_hi, expected_lo))
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return;
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@panic("__multf3 test failure");
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}
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fn makeNaN128(rand: u64) f128 {
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const int_result = @as(u128, 0x7fff000000000000 | (rand & 0xffffffffffff)) << 64;
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const float_result = @bitCast(f128, int_result);
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return float_result;
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}
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test "multf3" {
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// qNaN * any = qNaN
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test__multf3(qnan128, 0x1.23456789abcdefp+5, 0x7fff800000000000, 0x0);
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// NaN * any = NaN
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const a = makeNaN128(0x800030000000);
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test__multf3(a, 0x1.23456789abcdefp+5, 0x7fff800000000000, 0x0);
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// inf * any = inf
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test__multf3(inf128, 0x1.23456789abcdefp+5, 0x7fff000000000000, 0x0);
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// any * any
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test__multf3(
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@bitCast(f128, @as(u128, 0x40042eab345678439abcdefea5678234)),
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@bitCast(f128, @as(u128, 0x3ffeedcb34a235253948765432134675)),
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0x400423e7f9e3c9fc,
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0xd906c2c2a85777c4,
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);
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test__multf3(
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@bitCast(f128, @as(u128, 0x3fcd353e45674d89abacc3a2ebf3ff50)),
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@bitCast(f128, @as(u128, 0x3ff6ed8764648369535adf4be3214568)),
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0x3fc52a163c6223fc,
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0xc94c4bf0430768b4,
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);
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test__multf3(
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0x1.234425696abcad34a35eeffefdcbap+456,
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0x451.ed98d76e5d46e5f24323dff21ffp+600,
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0x44293a91de5e0e94,
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0xe8ed17cc2cdf64ac,
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);
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test__multf3(
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@bitCast(f128, @as(u128, 0x3f154356473c82a9fabf2d22ace345df)),
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@bitCast(f128, @as(u128, 0x3e38eda98765476743ab21da23d45679)),
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0x3d4f37c1a3137cae,
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0xfc6807048bc2836a,
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);
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test__multf3(0x1.23456734245345p-10000, 0x1.edcba524498724p-6497, 0x0, 0x0);
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}
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