More cleanup by FASTFLOAT_ONLY_ROUNDS_TO_NEAREST_SUPPORTED.

Author: IRainman

include/fast_float/float_common.h

@@ -1186,7 +1186,7 @@ template <>
 inline constexpr am_mant_t
 binary_format<double>::max_mantissa_fast_path(am_pow_t power) {
   // caller is responsible to ensure that
-  FASTFLOAT_ASSUME(power >= 0 && power <= 22);
+  // FASTFLOAT_ASSUME(power >= 0 && power <= 22);
 #if defined(__clang__)
   // Work around clang bug https://godbolt.org/z/zedh7rrhc
   return (void)max_mantissa[0], max_mantissa[power];
@@ -1199,7 +1199,7 @@ template <>
 inline constexpr am_mant_t
 binary_format<float>::max_mantissa_fast_path(am_pow_t power) {
   // caller is responsible to ensure that
-  FASTFLOAT_ASSUME(power >= 0 && power <= 10);
+  // FASTFLOAT_ASSUME(power >= 0 && power <= 10);
 #if defined(__clang__)
   // Work around clang bug https://godbolt.org/z/zedh7rrhc
   return (void)max_mantissa[0], max_mantissa[power];
@@ -1212,7 +1212,7 @@ template <>
 inline constexpr double
 binary_format<double>::exact_power_of_ten(am_pow_t power) {
   // caller is responsible to ensure that
-  FASTFLOAT_ASSUME(power >= 0 && power <= 22);
+  // FASTFLOAT_ASSUME(power >= 0 && power <= 22);
 #if defined(__clang__)
   // Work around clang bug https://godbolt.org/z/zedh7rrhc
   return (void)powers_of_ten[0], powers_of_ten[power];
@@ -1225,7 +1225,7 @@ template <>
 inline constexpr float
 binary_format<float>::exact_power_of_ten(am_pow_t power) {
   // caller is responsible to ensure that
-  FASTFLOAT_ASSUME(power >= 0 && power <= 10);
+  // FASTFLOAT_ASSUME(power >= 0 && power <= 10);
 #if defined(__clang__)
   // Work around clang bug https://godbolt.org/z/zedh7rrhc
   return (void)powers_of_ten[0], powers_of_ten[power];

include/fast_float/parse_number.h

@@ -218,11 +218,9 @@ clinger_fast_path_impl(am_mant_t const mantissa, am_pow_t const exponent,
     // We could check it first (before the previous branch), but
     // there might be performance advantages at having the check
     // be last.
-    if (!is_constant_evaluated()
 #ifndef FASTFLOAT_ONLY_ROUNDS_TO_NEAREST_SUPPORTED
-        && detail::rounds_to_nearest()
+    if (detail::rounds_to_nearest()) {
 #endif
-    ) {
       // We have that fegetround() == FE_TONEAREST.
       // Next is Clinger's fast path.
       if (mantissa <= binary_format<T>::max_mantissa_fast_path()) {
@@ -238,6 +236,7 @@ clinger_fast_path_impl(am_mant_t const mantissa, am_pow_t const exponent,
         }
 #endif
         return true;
+#ifndef FASTFLOAT_ONLY_ROUNDS_TO_NEAREST_SUPPORTED
       }
     } else {
       // We do not have that fegetround() == FE_TONEAREST.
@@ -265,6 +264,7 @@ clinger_fast_path_impl(am_mant_t const mantissa, am_pow_t const exponent,
 #endif
         return true;
       }
+#endif
     }
   }
   return false;