Update contrib/restricted/fast_float to 3.9.0

7 files changed, 75 insertions, 22 deletions

diff --git a/contrib/restricted/fast_float/README.md b/contrib/restricted/fast_float/README.md
index d6ae279527..7b3166abdd 100644
--- a/contrib/restricted/fast_float/README.md
+++ b/contrib/restricted/fast_float/README.md
@@ -124,6 +124,22 @@ You can parse delimited numbers:
   // we have result == 324562.645.
 ```
 
+
+## Relation With Other Work
+
+The fast_float library is part of:
+
+- GCC (as of version 12): the `from_chars` function in GCC relies on fast_float.
+- [WebKit](https://github.com/WebKit/WebKit), the engine behind Safari (Apple's web browser)
+
+
+The fastfloat algorithm is part of the [LLVM standard libraries](https://github.com/llvm/llvm-project/commit/87c016078ad72c46505461e4ff8bfa04819fe7ba).
+
+There is a [derived implementation part of AdaCore](https://github.com/AdaCore/VSS).
+
+
+The fast_float library provides a performance similar to that of the [fast_double_parser](https://github.com/lemire/fast_double_parser) library but using an updated algorithm reworked from the ground up, and while offering an API more in line with the expectations of C++ programmers. The fast_double_parser library is part of the [Microsoft LightGBM machine-learning framework](https://github.com/microsoft/LightGBM).
+
 ## Reference
 
 - Daniel Lemire, [Number Parsing at a Gigabyte per Second](https://arxiv.org/abs/2101.11408), Software: Practice and Experience 51 (8), 2021.
@@ -136,16 +152,6 @@ You can parse delimited numbers:
 - [There is a C# port of the fast_float library](https://github.com/CarlVerret/csFastFloat) called `csFastFloat`.
 
 
-## Relation With Other Work
-
-The fast_float library is part of GCC (as of version 12): the `from_chars` function in GCC relies on fast_float.
-
-The fastfloat algorithm is part of the [LLVM standard libraries](https://github.com/llvm/llvm-project/commit/87c016078ad72c46505461e4ff8bfa04819fe7ba).
-
-The fast_float library provides a performance similar to that of the [fast_double_parser](https://github.com/lemire/fast_double_parser) library but using an updated algorithm reworked from the ground up, and while offering an API more in line with the expectations of C++ programmers. The fast_double_parser library is part of the [Microsoft LightGBM machine-learning framework](https://github.com/microsoft/LightGBM).
-
-There is a [derived implementation part of AdaCore](https://github.com/AdaCore/VSS).
-
 ## Users
 
 The fast_float library is used by [Apache Arrow](https://github.com/apache/arrow/pull/8494) where it multiplied the number parsing speed by two or three times. It is also used by [Yandex ClickHouse](https://github.com/ClickHouse/ClickHouse) and by [Google Jsonnet](https://github.com/google/jsonnet).
diff --git a/contrib/restricted/fast_float/include/fast_float/ascii_number.h b/contrib/restricted/fast_float/include/fast_float/ascii_number.h
index 1783bd4ab1..ee376649c2 100644
--- a/contrib/restricted/fast_float/include/fast_float/ascii_number.h
+++ b/contrib/restricted/fast_float/include/fast_float/ascii_number.h
@@ -93,7 +93,11 @@ parsed_number_string parse_number_string(const char *p, const char *pend, parse_
   answer.valid = false;
   answer.too_many_digits = false;
   answer.negative = (*p == '-');
+#if FASTFLOAT_ALLOWS_LEADING_PLUS // disabled by default
+  if ((*p == '-') || (*p == '+')) {
+#else
   if (*p == '-') { // C++17 20.19.3.(7.1) explicitly forbids '+' sign here
+#endif
     ++p;
     if (p == pend) {
       return answer;
diff --git a/contrib/restricted/fast_float/include/fast_float/digit_comparison.h b/contrib/restricted/fast_float/include/fast_float/digit_comparison.h
index 77c710f57f..4c43433966 100644
--- a/contrib/restricted/fast_float/include/fast_float/digit_comparison.h
+++ b/contrib/restricted/fast_float/include/fast_float/digit_comparison.h
@@ -125,8 +125,8 @@ void round_nearest_tie_even(adjusted_mantissa& am, int32_t shift, callback cb) n
     halfway = uint64_t(1) << (shift - 1);
   }
   uint64_t truncated_bits = am.mantissa & mask;
-  uint64_t is_above = truncated_bits > halfway;
-  uint64_t is_halfway = truncated_bits == halfway;
+  bool is_above = truncated_bits > halfway;
+  bool is_halfway = truncated_bits == halfway;
 
   // shift digits into position
   if (shift == 64) {
diff --git a/contrib/restricted/fast_float/include/fast_float/fast_float.h b/contrib/restricted/fast_float/include/fast_float/fast_float.h
index ad3093ef88..d3497fd6b6 100644
--- a/contrib/restricted/fast_float/include/fast_float/fast_float.h
+++ b/contrib/restricted/fast_float/include/fast_float/fast_float.h
@@ -58,6 +58,6 @@ template<typename T>
 from_chars_result from_chars_advanced(const char *first, const char *last,
                                       T &value, parse_options options)  noexcept;
 
-}
+} // namespace fast_float
 #include "parse_number.h"
 #endif // FASTFLOAT_FAST_FLOAT_H
diff --git a/contrib/restricted/fast_float/include/fast_float/fast_table.h b/contrib/restricted/fast_float/include/fast_float/fast_table.h
index 5766274ca4..aa7804b2e4 100644
--- a/contrib/restricted/fast_float/include/fast_float/fast_table.h
+++ b/contrib/restricted/fast_float/include/fast_float/fast_table.h
@@ -17,11 +17,11 @@ namespace fast_float {
  */
 
 /**
- * The smallest non-zero float (binary64) is 2^−1074.
+ * The smallest non-zero float (binary64) is 2^-1074.
  * We take as input numbers of the form w x 10^q where w < 2^64.
  * We have that w * 10^-343  <  2^(64-344) 5^-343 < 2^-1076.
  * However, we have that
- * (2^64-1) * 10^-342 =  (2^64-1) * 2^-342 * 5^-342 > 2^−1074.
+ * (2^64-1) * 10^-342 =  (2^64-1) * 2^-342 * 5^-342 > 2^-1074.
  * Thus it is possible for a number of the form w * 10^-342 where
  * w is a 64-bit value to be a non-zero floating-point number.
  *********
@@ -694,6 +694,6 @@ const uint64_t powers_template<unused>::power_of_five_128[number_of_entries] = {
         0x8e679c2f5e44ff8f,0x570f09eaa7ea7648,};
 using powers = powers_template<>;
 
-}
+} // namespace fast_float
 
 #endif
diff --git a/contrib/restricted/fast_float/include/fast_float/float_common.h b/contrib/restricted/fast_float/include/fast_float/float_common.h
index c2084e0ed9..037cb0444c 100644
--- a/contrib/restricted/fast_float/include/fast_float/float_common.h
+++ b/contrib/restricted/fast_float/include/fast_float/float_common.h
@@ -14,7 +14,7 @@
        || (defined(__ppc64__) || defined(__PPC64__) || defined(__ppc64le__) || defined(__PPC64LE__)) )
 #define FASTFLOAT_64BIT 1
 #elif (defined(__i386) || defined(__i386__) || defined(_M_IX86)   \
-     || defined(__arm__) || defined(_M_ARM)                   \
+     || defined(__arm__) || defined(_M_ARM) || defined(__ppc__)   \
      || defined(__MINGW32__) || defined(__EMSCRIPTEN__))
 #define FASTFLOAT_32BIT 1
 #else
@@ -50,7 +50,11 @@
 #elif defined(sun) || defined(__sun)
 #include <sys/byteorder.h>
 #else
+#ifdef __has_include
+#if __has_include(<endian.h>)
 #include <endian.h>
+#endif //__has_include(<endian.h>)
+#endif //__has_include
 #endif
 #
 #ifndef __BYTE_ORDER__
@@ -77,12 +81,11 @@
 #endif
 
 #ifndef FASTFLOAT_ASSERT
-#define FASTFLOAT_ASSERT(x)  { if (!(x)) abort(); }
+#define FASTFLOAT_ASSERT(x)  { ((void)(x)); }
 #endif
 
 #ifndef FASTFLOAT_DEBUG_ASSERT
-#include <cassert>
-#define FASTFLOAT_DEBUG_ASSERT(x) assert(x)
+#define FASTFLOAT_DEBUG_ASSERT(x) { ((void)(x)); }
 #endif
 
 // rust style `try!()` macro, or `?` operator
@@ -218,8 +221,8 @@ constexpr static int32_t invalid_am_bias = -0x8000;
 constexpr static double powers_of_ten_double[] = {
     1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10, 1e11,
     1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22};
-constexpr static float powers_of_ten_float[] = {1e0, 1e1, 1e2, 1e3, 1e4, 1e5,
-                                                1e6, 1e7, 1e8, 1e9, 1e10};
+constexpr static float powers_of_ten_float[] = {1e0f, 1e1f, 1e2f, 1e3f, 1e4f, 1e5f,
+                                                1e6f, 1e7f, 1e8f, 1e9f, 1e10f};
 // used for max_mantissa_double and max_mantissa_float
 constexpr uint64_t constant_55555 = 5 * 5 * 5 * 5 * 5;
 // Largest integer value v so that (5**index * v) <= 1<<53.
@@ -449,6 +452,23 @@ fastfloat_really_inline void to_float(bool negative, adjusted_mantissa am, T &va
 #endif
 }
 
+#if FASTFLOAT_SKIP_WHITE_SPACE // disabled by default
+inline bool is_space(uint8_t c) {
+   static const bool table[] = {
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+   return table[c];
+ }
+#endif
 } // namespace fast_float
 
 #endif
diff --git a/contrib/restricted/fast_float/include/fast_float/parse_number.h b/contrib/restricted/fast_float/include/fast_float/parse_number.h
index 477288199e..2493b02f2c 100644
--- a/contrib/restricted/fast_float/include/fast_float/parse_number.h
+++ b/contrib/restricted/fast_float/include/fast_float/parse_number.h
@@ -99,7 +99,25 @@ fastfloat_really_inline bool rounds_to_nearest() noexcept {
   //
   // Note: This may fail to be accurate if fast-math has been
   // enabled, as rounding conventions may not apply.
+  #if FASTFLOAT_VISUAL_STUDIO
+  #   pragma warning(push)
+  //  todo: is there a VS warning?
+  //  see https://stackoverflow.com/questions/46079446/is-there-a-warning-for-floating-point-equality-checking-in-visual-studio-2013
+  #elif defined(__clang__)
+  #   pragma clang diagnostic push
+  #   pragma clang diagnostic ignored "-Wfloat-equal"
+  #elif defined(__GNUC__)
+  #   pragma GCC diagnostic push
+  #   pragma GCC diagnostic ignored "-Wfloat-equal"
+  #endif
   return (fmini + 1.0f == 1.0f - fmini);
+  #if FASTFLOAT_VISUAL_STUDIO
+  #   pragma warning(pop)
+  #elif defined(__clang__)
+  #   pragma clang diagnostic pop
+  #elif defined(__GNUC__)
+  #   pragma GCC diagnostic pop
+  #endif
 }
 
 } // namespace detail
@@ -118,6 +136,11 @@ from_chars_result from_chars_advanced(const char *first, const char *last,
 
 
   from_chars_result answer;
+#if FASTFLOAT_SKIP_WHITE_SPACE  // disabled by default
+  while ((first != last) && fast_float::is_space(uint8_t(*first))) {
+    first++;
+  }
+#endif
   if (first == last) {
     answer.ec = std::errc::invalid_argument;
     answer.ptr = first;