Revert "[reland][libc][NFC] Use user defined literals to build 128 and 256 bit constants"

libc/src/__support/integer_literals.h

@@ -22,19 +22,19 @@
 namespace LIBC_NAMESPACE {
 
 LIBC_INLINE constexpr uint8_t operator""_u8(unsigned long long value) {
-  return static_cast<uint8_t>(value);
+  return value;
 }
 
 LIBC_INLINE constexpr uint16_t operator""_u16(unsigned long long value) {
-  return static_cast<uint16_t>(value);
+  return value;
 }
 
 LIBC_INLINE constexpr uint32_t operator""_u32(unsigned long long value) {
-  return static_cast<uint32_t>(value);
+  return value;
 }
 
 LIBC_INLINE constexpr uint64_t operator""_u64(unsigned long long value) {
-  return static_cast<uint64_t>(value);
+  return value;
 }
 
 namespace internal {
@@ -64,7 +64,6 @@ template <typename T, int base> struct DigitBuffer {
                                                                         : 0;
   LIBC_INLINE_VAR static constexpr size_t MAX_DIGITS =
       sizeof(T) * CHAR_BIT / BITS_PER_DIGIT;
-  LIBC_INLINE_VAR static constexpr uint8_t INVALID_DIGIT = 255;
 
   uint8_t digits[MAX_DIGITS] = {};
   size_t size = 0;
@@ -75,26 +74,26 @@ template <typename T, int base> struct DigitBuffer {
   }
 
   // Returns the digit for a particular character.
-  // Returns INVALID_DIGIT if the character is invalid.
+  // Returns 255 if the character is invalid.
   LIBC_INLINE static constexpr uint8_t get_digit_value(const char c) {
     const auto to_lower = [](char c) { return c | 32; };
     const auto is_digit = [](char c) { return c >= '0' && c <= '9'; };
     const auto is_alpha = [](char c) {
       return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
     };
     if (is_digit(c))
-      return static_cast<uint8_t>(c - '0');
+      return c - '0';
     if (base > 10 && is_alpha(c))
-      return static_cast<uint8_t>(to_lower(c) - 'a' + 10);
-    return INVALID_DIGIT;
+      return to_lower(c) - 'a' + 10;
+    return 255;
   }
 
   // Adds a single character to this buffer.
   LIBC_INLINE constexpr void push(char c) {
     if (c == '\'')
       return; // ' is valid but not taken into account.
     const uint8_t value = get_digit_value(c);
-    if (value == INVALID_DIGIT || size >= MAX_DIGITS) {
+    if (value == 255 || size >= MAX_DIGITS) {
       // During constant evaluation `__builtin_unreachable` will halt the
       // compiler as it is not executable. This is preferable over `assert` that
       // will only trigger in debug mode. Also we can't use `static_assert`
@@ -132,7 +131,7 @@ struct Parser<LIBC_NAMESPACE::cpp::BigInt<N, false, uint64_t>> {
       // Fast path, we consume blocks of uint64_t and creates the BigInt's
       // internal representation directly.
       using U64ArrayT = cpp::array<uint64_t, UIntT::WORD_COUNT>;
-      U64ArrayT array = {};
+      U64ArrayT array;
       size_t size = buffer.size;
       const uint8_t *digit_ptr = buffer.digits + size;
       for (size_t i = 0; i < array.size(); ++i) {

libc/src/math/generic/CMakeLists.txt

@@ -622,8 +622,6 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .explogxf
-    libc.include.errno
-    libc.include.math
     libc.src.__support.CPP.bit
     libc.src.__support.CPP.optional
     libc.src.__support.FPUtil.dyadic_float
@@ -634,9 +632,10 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.polyeval
     libc.src.__support.FPUtil.rounding_mode
     libc.src.__support.FPUtil.triple_double
-    libc.src.__support.integer_literals
     libc.src.__support.macros.optimization
+    libc.include.errno
     libc.src.errno.errno
+    libc.include.math
   COMPILE_OPTIONS
     -O3
 )
@@ -673,8 +672,6 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .explogxf
-    libc.include.errno
-    libc.include.math
     libc.src.__support.CPP.bit
     libc.src.__support.CPP.optional
     libc.src.__support.FPUtil.dyadic_float
@@ -685,9 +682,10 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.polyeval
     libc.src.__support.FPUtil.rounding_mode
     libc.src.__support.FPUtil.triple_double
-    libc.src.__support.integer_literals
     libc.src.__support.macros.optimization
+    libc.include.errno
     libc.src.errno.errno
+    libc.include.math
   COMPILE_OPTIONS
     -O3
 )
@@ -733,8 +731,6 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .explogxf
-    libc.include.errno
-    libc.include.math
     libc.src.__support.CPP.bit
     libc.src.__support.CPP.optional
     libc.src.__support.FPUtil.dyadic_float
@@ -745,9 +741,10 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.polyeval
     libc.src.__support.FPUtil.rounding_mode
     libc.src.__support.FPUtil.triple_double
-    libc.src.__support.integer_literals
     libc.src.__support.macros.optimization
+    libc.include.errno
     libc.src.errno.errno
+    libc.include.math
   COMPILE_OPTIONS
     -O3
 )
@@ -794,8 +791,6 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .explogxf
-    libc.include.errno
-    libc.include.math
     libc.src.__support.CPP.bit
     libc.src.__support.CPP.optional
     libc.src.__support.FPUtil.dyadic_float
@@ -806,9 +801,10 @@ add_entrypoint_object(
     libc.src.__support.FPUtil.polyeval
     libc.src.__support.FPUtil.rounding_mode
     libc.src.__support.FPUtil.triple_double
-    libc.src.__support.integer_literals
     libc.src.__support.macros.optimization
+    libc.include.errno
     libc.src.errno.errno
+    libc.include.math
   COMPILE_OPTIONS
     -O3
 )
@@ -1078,13 +1074,12 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .log_range_reduction
-    libc.src.__support.FPUtil.double_double
-    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.FPUtil.fenv_impl
     libc.src.__support.FPUtil.fp_bits
     libc.src.__support.FPUtil.multiply_add
     libc.src.__support.FPUtil.polyeval
-    libc.src.__support.integer_literals
+    libc.src.__support.FPUtil.double_double
+    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.macros.optimization
   COMPILE_OPTIONS
     -O3
@@ -1115,13 +1110,12 @@ add_entrypoint_object(
     ../log1p.h
   DEPENDS
     .common_constants
-    libc.src.__support.FPUtil.double_double
-    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.FPUtil.fenv_impl
     libc.src.__support.FPUtil.fp_bits
     libc.src.__support.FPUtil.multiply_add
     libc.src.__support.FPUtil.polyeval
-    libc.src.__support.integer_literals
+    libc.src.__support.FPUtil.double_double
+    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.macros.optimization
   COMPILE_OPTIONS
     -O3
@@ -1154,13 +1148,12 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .log_range_reduction
-    libc.src.__support.FPUtil.double_double
-    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.FPUtil.fenv_impl
     libc.src.__support.FPUtil.fp_bits
     libc.src.__support.FPUtil.multiply_add
     libc.src.__support.FPUtil.polyeval
-    libc.src.__support.integer_literals
+    libc.src.__support.FPUtil.double_double
+    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.macros.optimization
   COMPILE_OPTIONS
     -O3
@@ -1193,13 +1186,12 @@ add_entrypoint_object(
   DEPENDS
     .common_constants
     .log_range_reduction
-    libc.src.__support.FPUtil.double_double
-    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.FPUtil.fenv_impl
     libc.src.__support.FPUtil.fp_bits
     libc.src.__support.FPUtil.multiply_add
     libc.src.__support.FPUtil.polyeval
-    libc.src.__support.integer_literals
+    libc.src.__support.FPUtil.double_double
+    libc.src.__support.FPUtil.dyadic_float
     libc.src.__support.macros.optimization
   COMPILE_OPTIONS
     -O3

libc/src/math/generic/exp.cpp

@@ -21,7 +21,6 @@
 #include "src/__support/FPUtil/rounding_mode.h"
 #include "src/__support/FPUtil/triple_double.h"
 #include "src/__support/common.h"
-#include "src/__support/integer_literals.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
 
 #include <errno.h>
@@ -32,7 +31,6 @@ using fputil::DoubleDouble;
 using fputil::TripleDouble;
 using Float128 = typename fputil::DyadicFloat<128>;
 using Sign = fputil::Sign;
-using LIBC_NAMESPACE::operator""_u128;
 
 // log2(e)
 constexpr double LOG2_E = 0x1.71547652b82fep+0;
@@ -99,15 +97,21 @@ DoubleDouble poly_approx_dd(const DoubleDouble &dx) {
 // For |dx| < 2^-13 + 2^-30:
 //   | output - exp(dx) | < 2^-126.
 Float128 poly_approx_f128(const Float128 &dx) {
+  using MType = typename Float128::MantissaType;
+
   constexpr Float128 COEFFS_128[]{
-      {Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1.0
-      {Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1.0
-      {Sign::POS, -128, 0x80000000'00000000'00000000'00000000_u128}, // 0.5
-      {Sign::POS, -130, 0xaaaaaaaa'aaaaaaaa'aaaaaaaa'aaaaaaab_u128}, // 1/6
-      {Sign::POS, -132, 0xaaaaaaaa'aaaaaaaa'aaaaaaaa'aaaaaaab_u128}, // 1/24
-      {Sign::POS, -134, 0x88888888'88888888'88888888'88888889_u128}, // 1/120
-      {Sign::POS, -137, 0xb60b60b6'0b60b60b'60b60b60'b60b60b6_u128}, // 1/720
-      {Sign::POS, -140, 0xd00d00d0'0d00d00d'00d00d00'd00d00d0_u128}, // 1/5040
+      {Sign::POS, -127, MType({0, 0x8000000000000000})},                  // 1.0
+      {Sign::POS, -127, MType({0, 0x8000000000000000})},                  // 1.0
+      {Sign::POS, -128, MType({0, 0x8000000000000000})},                  // 0.5
+      {Sign::POS, -130, MType({0xaaaaaaaaaaaaaaab, 0xaaaaaaaaaaaaaaaa})}, // 1/6
+      {Sign::POS, -132,
+       MType({0xaaaaaaaaaaaaaaab, 0xaaaaaaaaaaaaaaaa})}, // 1/24
+      {Sign::POS, -134,
+       MType({0x8888888888888889, 0x8888888888888888})}, // 1/120
+      {Sign::POS, -137,
+       MType({0x60b60b60b60b60b6, 0xb60b60b60b60b60b})}, // 1/720
+      {Sign::POS, -140,
+       MType({0x00d00d00d00d00d0, 0xd00d00d00d00d00d})}, // 1/5040
   };
 
   Float128 p = fputil::polyeval(dx, COEFFS_128[0], COEFFS_128[1], COEFFS_128[2],

libc/src/math/generic/exp10.cpp

@@ -21,7 +21,6 @@
 #include "src/__support/FPUtil/rounding_mode.h"
 #include "src/__support/FPUtil/triple_double.h"
 #include "src/__support/common.h"
-#include "src/__support/integer_literals.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
 
 #include <errno.h>
@@ -32,7 +31,6 @@ using fputil::DoubleDouble;
 using fputil::TripleDouble;
 using Float128 = typename fputil::DyadicFloat<128>;
 using Sign = fputil::Sign;
-using LIBC_NAMESPACE::operator""_u128;
 
 // log2(10)
 constexpr double LOG2_10 = 0x1.a934f0979a371p+1;
@@ -101,15 +99,17 @@ DoubleDouble poly_approx_dd(const DoubleDouble &dx) {
 // For |dx| < 2^-14:
 //   | output - 10^dx | < 1.5 * 2^-124.
 Float128 poly_approx_f128(const Float128 &dx) {
+  using MType = typename Float128::MantissaType;
+
   constexpr Float128 COEFFS_128[]{
-      {Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1.0
-      {Sign::POS, -126, 0x935d8ddd'aaa8ac16'ea56d62b'82d30a2d_u128},
-      {Sign::POS, -126, 0xa9a92639'e753443a'80a99ce7'5f4d5bdb_u128},
-      {Sign::POS, -126, 0x82382c8e'f1652304'6a4f9d7d'bf6c9635_u128},
-      {Sign::POS, -124, 0x12bd7609'fd98c44c'34578701'9216c7af_u128},
-      {Sign::POS, -127, 0x450a7ff4'7535d889'cc41ed7e'0d27aee5_u128},
-      {Sign::POS, -130, 0xd3f6b844'702d636b'8326bb91'a6e7601d_u128},
-      {Sign::POS, -130, 0x45b937f0'd05bb1cd'fa7b46df'314112a9_u128},
+      {Sign::POS, -127, MType({0, 0x8000000000000000})}, // 1.0
+      {Sign::POS, -126, MType({0xea56d62b82d30a2d, 0x935d8dddaaa8ac16})},
+      {Sign::POS, -126, MType({0x80a99ce75f4d5bdb, 0xa9a92639e753443a})},
+      {Sign::POS, -126, MType({0x6a4f9d7dbf6c9635, 0x82382c8ef1652304})},
+      {Sign::POS, -124, MType({0x345787019216c7af, 0x12bd7609fd98c44c})},
+      {Sign::POS, -127, MType({0xcc41ed7e0d27aee5, 0x450a7ff47535d889})},
+      {Sign::POS, -130, MType({0x8326bb91a6e7601d, 0xd3f6b844702d636b})},
+      {Sign::POS, -130, MType({0xfa7b46df314112a9, 0x45b937f0d05bb1cd})},
   };
 
   Float128 p = fputil::polyeval(dx, COEFFS_128[0], COEFFS_128[1], COEFFS_128[2],

libc/src/math/generic/exp2.cpp

@@ -21,7 +21,6 @@
 #include "src/__support/FPUtil/rounding_mode.h"
 #include "src/__support/FPUtil/triple_double.h"
 #include "src/__support/common.h"
-#include "src/__support/integer_literals.h"
 #include "src/__support/macros/optimization.h" // LIBC_UNLIKELY
 
 #include <errno.h>
@@ -32,7 +31,6 @@ using fputil::DoubleDouble;
 using fputil::TripleDouble;
 using Float128 = typename fputil::DyadicFloat<128>;
 using Sign = fputil::Sign;
-using LIBC_NAMESPACE::operator""_u128;
 
 // Error bounds:
 // Errors when using double precision.
@@ -90,15 +88,17 @@ DoubleDouble poly_approx_dd(const DoubleDouble &dx) {
 // For |dx| < 2^-13 + 2^-30:
 //   | output - exp(dx) | < 2^-126.
 Float128 poly_approx_f128(const Float128 &dx) {
+  using MType = typename Float128::MantissaType;
+
   constexpr Float128 COEFFS_128[]{
-      {Sign::POS, -127, 0x80000000'00000000'00000000'00000000_u128}, // 1.0
-      {Sign::POS, -128, 0xb17217f7'd1cf79ab'c9e3b398'03f2f6af_u128},
-      {Sign::POS, -128, 0x3d7f7bff'058b1d50'de2d60dd'9c9a1d9f_u128},
-      {Sign::POS, -132, 0xe35846b8'2505fc59'9d3b15d9'e7fb6897_u128},
-      {Sign::POS, -134, 0x9d955b7d'd273b94e'184462f6'bcd2b9e7_u128},
-      {Sign::POS, -137, 0xaec3ff3c'53398883'39ea1bb9'64c51a89_u128},
-      {Sign::POS, -138, 0x2861225f'345c396a'842c5341'8fa8ae61_u128},
-      {Sign::POS, -144, 0xffe5fe2d'109a319d'7abeb5ab'd5ad2079_u128},
+      {Sign::POS, -127, MType({0, 0x8000000000000000})}, // 1.0
+      {Sign::POS, -128, MType({0xc9e3b39803f2f6af, 0xb17217f7d1cf79ab})},
+      {Sign::POS, -128, MType({0xde2d60dd9c9a1d9f, 0x3d7f7bff058b1d50})},
+      {Sign::POS, -132, MType({0x9d3b15d9e7fb6897, 0xe35846b82505fc59})},
+      {Sign::POS, -134, MType({0x184462f6bcd2b9e7, 0x9d955b7dd273b94e})},
+      {Sign::POS, -137, MType({0x39ea1bb964c51a89, 0xaec3ff3c53398883})},
+      {Sign::POS, -138, MType({0x842c53418fa8ae61, 0x2861225f345c396a})},
+      {Sign::POS, -144, MType({0x7abeb5abd5ad2079, 0xffe5fe2d109a319d})},
   };
 
   Float128 p = fputil::polyeval(dx, COEFFS_128[0], COEFFS_128[1], COEFFS_128[2],