compiler_rt: Implement floatXiYf/fixXfYi, incl f80

This change:
 - Adds  generic implementation of the float -> integer conversion
   functions floatXiYf, including support for f80
 - Updates the existing implementation of integer -> float conversion
   fixXiYf to support f16 and f80
 - Fixes the handling of the explicit integer bit in `__trunctfxf2`
 - Combines the test cases for fixXfYi/floatXiYf into a single file
 - Renames `fmodl` to `fmodq`, since it operates on 128-bit floats

The new implementation for floatXiYf has been benchmarked, and generally
provides equal or better performance versus the current implementations:

Throughput (MiB/s) - Before
     |    u32   |    i32   |    u64   |    i64   |   u128   |   i128   |
-----|----------|----------|----------|----------|----------|----------|
 f16 |     none |     none |     none |     none |     none |     none |
 f32 |  2231.67 |  2001.19 |  1745.66 |  1405.77 |  2173.99 |  1874.63 |
 f64 |  1407.17 |  1055.83 |  2911.68 |  2437.21 |  1676.05 |  1476.67 |
 f80 |     none |     none |     none |     none |     none |     none |
f128 |   327.56 |   321.25 |   645.92 |   654.52 |  1153.56 |  1096.27 |

Throughput (MiB/s) - After
     |    u32   |    i32   |    u64   |    i64   |   u128   |   i128   |
-----|----------|----------|----------|----------|----------|----------|
 f16 |  1407.61 |  1637.25 |  3555.03 |  2594.56 |  3680.60 |  3063.34 |
 f32 |  2101.36 |  2122.62 |  3225.46 |  3123.86 |  2860.05 |  1985.21 |
 f64 |  1395.57 |  1314.87 |  2409.24 |  2196.30 |  2384.95 |  1908.15 |
 f80 |   475.53 |   457.92 |   884.50 |   812.12 |  1475.27 |  1382.16 |
f128 |   359.60 |   350.91 |   723.08 |   706.80 |  1296.42 |  1198.87 |

1 files changed, 0 insertions, 72 deletions

diff --git a/lib/std/special/compiler_rt/fixtfsi_test.zig b/lib/std/special/compiler_rt/fixtfsi_test.zig
deleted file mode 100644
index f05a4778f0..0000000000
--- a/lib/std/special/compiler_rt/fixtfsi_test.zig
+++ /dev/null
@@ -1,72 +0,0 @@
-const __fixtfsi = @import("fixtfsi.zig").__fixtfsi;
-const std = @import("std");
-const math = std.math;
-const testing = std.testing;
-
-fn test__fixtfsi(a: f128, expected: i32) !void {
-    const x = __fixtfsi(a);
-    try testing.expect(x == expected);
-}
-
-test "fixtfsi" {
-    try test__fixtfsi(-math.floatMax(f128), math.minInt(i32));
-
-    try test__fixtfsi(-0x1.FFFFFFFFFFFFFp+1023, math.minInt(i32));
-    try test__fixtfsi(-0x1.FFFFFFFFFFFFFp+1023, -0x80000000);
-
-    try test__fixtfsi(-0x1.0000000000000p+127, -0x80000000);
-    try test__fixtfsi(-0x1.FFFFFFFFFFFFFp+126, -0x80000000);
-    try test__fixtfsi(-0x1.FFFFFFFFFFFFEp+126, -0x80000000);
-
-    try test__fixtfsi(-0x1.0000000000001p+63, -0x80000000);
-    try test__fixtfsi(-0x1.0000000000000p+63, -0x80000000);
-    try test__fixtfsi(-0x1.FFFFFFFFFFFFFp+62, -0x80000000);
-    try test__fixtfsi(-0x1.FFFFFFFFFFFFEp+62, -0x80000000);
-
-    try test__fixtfsi(-0x1.FFFFFEp+62, -0x80000000);
-    try test__fixtfsi(-0x1.FFFFFCp+62, -0x80000000);
-
-    try test__fixtfsi(-0x1.000000p+31, -0x80000000);
-    try test__fixtfsi(-0x1.FFFFFFp+30, -0x7FFFFFC0);
-    try test__fixtfsi(-0x1.FFFFFEp+30, -0x7FFFFF80);
-    try test__fixtfsi(-0x1.FFFFFCp+30, -0x7FFFFF00);
-
-    try test__fixtfsi(-2.01, -2);
-    try test__fixtfsi(-2.0, -2);
-    try test__fixtfsi(-1.99, -1);
-    try test__fixtfsi(-1.0, -1);
-    try test__fixtfsi(-0.99, 0);
-    try test__fixtfsi(-0.5, 0);
-    try test__fixtfsi(-@as(f128, math.floatMin(f32)), 0);
-    try test__fixtfsi(0.0, 0);
-    try test__fixtfsi(@as(f128, math.floatMin(f32)), 0);
-    try test__fixtfsi(0.5, 0);
-    try test__fixtfsi(0.99, 0);
-    try test__fixtfsi(1.0, 1);
-    try test__fixtfsi(1.5, 1);
-    try test__fixtfsi(1.99, 1);
-    try test__fixtfsi(2.0, 2);
-    try test__fixtfsi(2.01, 2);
-
-    try test__fixtfsi(0x1.FFFFFCp+30, 0x7FFFFF00);
-    try test__fixtfsi(0x1.FFFFFEp+30, 0x7FFFFF80);
-    try test__fixtfsi(0x1.FFFFFFp+30, 0x7FFFFFC0);
-    try test__fixtfsi(0x1.000000p+31, 0x7FFFFFFF);
-
-    try test__fixtfsi(0x1.FFFFFCp+62, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.FFFFFEp+62, 0x7FFFFFFF);
-
-    try test__fixtfsi(0x1.FFFFFFFFFFFFEp+62, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.FFFFFFFFFFFFFp+62, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.0000000000000p+63, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.0000000000001p+63, 0x7FFFFFFF);
-
-    try test__fixtfsi(0x1.FFFFFFFFFFFFEp+126, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.FFFFFFFFFFFFFp+126, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.0000000000000p+127, 0x7FFFFFFF);
-
-    try test__fixtfsi(0x1.FFFFFFFFFFFFFp+1023, 0x7FFFFFFF);
-    try test__fixtfsi(0x1.FFFFFFFFFFFFFp+1023, math.maxInt(i32));
-
-    try test__fixtfsi(math.floatMax(f128), math.maxInt(i32));
-}