Address comments.

Author: lntue

libc/src/__support/CPP/bit.h

@@ -68,13 +68,9 @@ LIBC_INLINE constexpr cpp::enable_if_t<
     void>
 bit_copy(const From &from, To &to) {
   MSAN_UNPOISON(&from, sizeof(From));
-  if constexpr (sizeof(To) == sizeof(From)) {
-    to = bit_cast<To>(from);
-  } else {
-    char *dst = reinterpret_cast<char *>(&to);
-    const char *src = reinterpret_cast<const char *>(&from);
-    inline_copy<sizeof(From)>(src, dst);
-  }
+  char *dst = reinterpret_cast<char *>(&to);
+  const char *src = reinterpret_cast<const char *>(&from);
+  inline_copy<sizeof(From)>(src, dst);
 }
 
 template <typename T>

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

@@ -114,7 +114,7 @@ LIBC_INLINE static void raise_except(uint16_t excepts) {
       [[maybe_unused]] volatile float z = EXCEPTION_INPUTS[idx][0];
       z /= EXCEPTION_INPUTS[idx][1];
     } else {
-      // For the remaining exceptions, we floating point multiplications.
+      // For the remaining exceptions, we use floating point multiplications.
       [[maybe_unused]] volatile float z = EXCEPTION_INPUTS[idx][0];
       z *= EXCEPTION_INPUTS[idx][1];
     }

libc/src/__support/FPUtil/x86_64/fenv_x86_common.h

@@ -78,8 +78,6 @@ struct RoundingControl {
   static constexpr uint16_t ERROR = 0xFFFF;
 };
 
-static constexpr uint16_t MXCSR_ROUNDING_CONTROL_BIT_POSITION = 13;
-
 // Exception flags are individual bits in the corresponding registers.
 // So, we just OR the bit values to get the full set of exceptions.
 LIBC_INLINE static uint16_t get_status_value_from_except(int excepts) {