Update bazel, progress docs, address review comments

Author: nishantwrp

libc/docs/math/index.rst

@@ -230,11 +230,11 @@ Basic Operations
 +--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
 | nextafterl   | |check| | |check| |         | |check| | |check| |         |         | |check| |         |         |         |         |
 +--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
-| nexttoward   |         |         |         |         |         |         |         |         |         |         |         |         |
+| nexttoward   | |check| | |check| |         | |check| | |check| |         |         | |check| |         |         |         |         |
 +--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
-| nexttowardf  |         |         |         |         |         |         |         |         |         |         |         |         |
+| nexttowardf  | |check| | |check| |         | |check| | |check| |         |         | |check| |         |         |         |         |
 +--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
-| nexttowardl  |         |         |         |         |         |         |         |         |         |         |         |         |
+| nexttowardl  | |check| | |check| |         | |check| | |check| |         |         | |check| |         |         |         |         |
 +--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
 | remainder    | |check| | |check| |         | |check| | |check| |         |         | |check| |         |         |         |         |
 +--------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+

libc/src/__support/FPUtil/CMakeLists.txt

@@ -94,6 +94,7 @@ add_header_library(
   HDRS
     ManipulationFunctions.h
   DEPENDS
+    .fenv_impl
     .fp_bits
     .nearest_integer_operations
     .normal_float

libc/src/__support/FPUtil/ManipulationFunctions.h

@@ -17,10 +17,10 @@
 
 #include "src/__support/CPP/bit.h"
 #include "src/__support/CPP/type_traits.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/macros/attributes.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
 
-#include <fenv.h>
 #include <limits.h>
 #include <math.h>
 
@@ -180,8 +180,9 @@ LIBC_INLINE T nextafter(T from, T to) {
   return cpp::bit_cast<T>(int_val);
 }
 
-template <typename T, cpp::enable_if_t<cpp::is_floating_point_v<T>, int> = 0>
-LIBC_INLINE T nexttoward(T from, long double to) {
+template <typename T>
+LIBC_INLINE cpp::enable_if_t<cpp::is_floating_point_v<T>, T>
+nexttoward(T from, long double to) {
   FPBits<T> from_bits(from);
   if (from_bits.is_nan())
     return from;

libc/src/__support/FPUtil/x86_64/NextAfterLongDouble.h

@@ -16,6 +16,7 @@
 #endif
 
 #include "src/__support/CPP/bit.h"
+#include "src/__support/FPUtil/FEnvImpl.h"
 #include "src/__support/FPUtil/FPBits.h"
 
 #include <stdint.h>

libc/src/math/generic/CMakeLists.txt

@@ -1483,7 +1483,7 @@ add_entrypoint_object(
   DEPENDS
     libc.src.__support.FPUtil.manipulation_functions
   COMPILE_OPTIONS
-    -O2
+    -O3
 )
 
 add_entrypoint_object(
@@ -1495,7 +1495,7 @@ add_entrypoint_object(
   DEPENDS
     libc.src.__support.FPUtil.manipulation_functions
   COMPILE_OPTIONS
-    -O2
+    -O3
 )
 
 add_entrypoint_object(
@@ -1507,7 +1507,7 @@ add_entrypoint_object(
   DEPENDS
     libc.src.__support.FPUtil.manipulation_functions
   COMPILE_OPTIONS
-    -O2
+    -O3
 )
 
 add_entrypoint_object(

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -1872,6 +1872,12 @@ libc_math_function(name = "nextafterf")
 
 libc_math_function(name = "nextafterl")
 
+libc_math_function(name = "nexttoward")
+
+libc_math_function(name = "nexttowardf")
+
+libc_math_function(name = "nexttowardl")
+
 libc_math_function(name = "scalbn")
 
 libc_math_function(name = "scalbnf")