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, 2 insertions, 35 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22e17d84c6..81b96d67ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -493,41 +493,8 @@ set(ZIG_STAGE2_SOURCES
     "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/divtf3.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/divti3.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/extendXfYf2.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixdfdi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixdfsi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixdfti.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixint.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixsfdi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixsfsi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixsfti.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixtfdi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixtfsi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixtfti.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixuint.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunsdfdi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunsdfsi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunsdfti.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunssfdi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunssfsi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunssfti.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunstfdi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunstfsi.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixunstfti.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatXisf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatdidf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatditf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatsiXf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floattidf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floattitf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatundidf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatundisf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatunditf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatunsidf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatunsisf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatunsitf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatuntidf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatuntisf.zig"
-    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatuntitf.zig"
+    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/fixXfYi.zig"
+    "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/floatXiYf.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/int.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/modti3.zig"
     "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/mulXf3.zig"