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, 16 deletions

diff --git a/lib/std/special/compiler_rt/fixdfsi.zig b/lib/std/special/compiler_rt/fixdfsi.zig
deleted file mode 100644
index 5842d99cd3..0000000000
--- a/lib/std/special/compiler_rt/fixdfsi.zig
+++ /dev/null
@@ -1,16 +0,0 @@
-const fixint = @import("fixint.zig").fixint;
-const builtin = @import("builtin");
-
-pub fn __fixdfsi(a: f64) callconv(.C) i32 {
-    @setRuntimeSafety(builtin.is_test);
-    return fixint(f64, i32, a);
-}
-
-pub fn __aeabi_d2iz(a: f64) callconv(.AAPCS) i32 {
-    @setRuntimeSafety(false);
-    return @call(.{ .modifier = .always_inline }, __fixdfsi, .{a});
-}
-
-test {
-    _ = @import("fixdfsi_test.zig");
-}