diff options
Diffstat (limited to 'StdLib/LibC/Main/Arm/fp_lib.h')
| -rw-r--r-- | StdLib/LibC/Main/Arm/fp_lib.h | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/StdLib/LibC/Main/Arm/fp_lib.h b/StdLib/LibC/Main/Arm/fp_lib.h new file mode 100644 index 0000000000..2b46cfab0c --- /dev/null +++ b/StdLib/LibC/Main/Arm/fp_lib.h @@ -0,0 +1,282 @@ +/**
+University of Illinois/NCSA
+Open Source License
+
+Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
+
+All rights reserved.
+
+Developed by:
+
+ LLVM Team
+
+ University of Illinois at Urbana-Champaign
+
+ http://llvm.org
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal with
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimers.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimers in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the names of the LLVM Team, University of Illinois at
+ Urbana-Champaign, nor the names of its contributors may be used to
+ endorse or promote products derived from this Software without specific
+ prior written permission.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
+SOFTWARE.
+**/
+
+#ifndef FP_LIB_HEADER
+#define FP_LIB_HEADER
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <limits.h>
+#include "int_lib.h"
+
+#if defined SINGLE_PRECISION
+
+typedef uint32_t rep_t;
+typedef int32_t srep_t;
+typedef float fp_t;
+#define REP_C UINT32_C
+#define significandBits 23
+
+static inline int rep_clz(rep_t a) {
+ return __builtin_clz(a);
+}
+
+// 32x32 --> 64 bit multiply
+static inline void wideMultiply(rep_t a, rep_t b, rep_t *hi, rep_t *lo) {
+ const uint64_t product = (uint64_t)a*b;
+ *hi = product >> 32;
+ *lo = product;
+}
+COMPILER_RT_ABI fp_t __addsf3(fp_t a, fp_t b);
+
+#elif defined DOUBLE_PRECISION
+
+typedef uint64_t rep_t;
+typedef int64_t srep_t;
+typedef double fp_t;
+#define REP_C UINT64_C
+#define significandBits 52
+
+static inline int rep_clz(rep_t a) {
+#if defined __LP64__
+ return __builtin_clzl(a);
+#else
+ if (a & REP_C(0xffffffff00000000))
+ return __builtin_clz(a >> 32);
+ else
+ return 32 + __builtin_clz(a & REP_C(0xffffffff));
+#endif
+}
+
+#define loWord(a) (a & 0xffffffffU)
+#define hiWord(a) (a >> 32)
+
+// 64x64 -> 128 wide multiply for platforms that don't have such an operation;
+// many 64-bit platforms have this operation, but they tend to have hardware
+// floating-point, so we don't bother with a special case for them here.
+static inline void wideMultiply(rep_t a, rep_t b, rep_t *hi, rep_t *lo) {
+ // Each of the component 32x32 -> 64 products
+ const uint64_t plolo = loWord(a) * loWord(b);
+ const uint64_t plohi = loWord(a) * hiWord(b);
+ const uint64_t philo = hiWord(a) * loWord(b);
+ const uint64_t phihi = hiWord(a) * hiWord(b);
+ // Sum terms that contribute to lo in a way that allows us to get the carry
+ const uint64_t r0 = loWord(plolo);
+ const uint64_t r1 = hiWord(plolo) + loWord(plohi) + loWord(philo);
+ *lo = r0 + (r1 << 32);
+ // Sum terms contributing to hi with the carry from lo
+ *hi = hiWord(plohi) + hiWord(philo) + hiWord(r1) + phihi;
+}
+#undef loWord
+#undef hiWord
+
+COMPILER_RT_ABI fp_t __adddf3(fp_t a, fp_t b);
+
+#elif defined QUAD_PRECISION
+#if __LDBL_MANT_DIG__ == 113
+#define CRT_LDBL_128BIT
+typedef __uint128_t rep_t;
+typedef __int128_t srep_t;
+typedef long double fp_t;
+#define REP_C (__uint128_t)
+// Note: Since there is no explicit way to tell compiler the constant is a
+// 128-bit integer, we let the constant be casted to 128-bit integer
+#define significandBits 112
+
+static inline int rep_clz(rep_t a) {
+ const union
+ {
+ __uint128_t ll;
+#if _YUGA_BIG_ENDIAN
+ struct { uint64_t high, low; } s;
+#else
+ struct { uint64_t low, high; } s;
+#endif
+ } uu = { .ll = a };
+
+ uint64_t word;
+ uint64_t add;
+
+ if (uu.s.high){
+ word = uu.s.high;
+ add = 0;
+ }
+ else{
+ word = uu.s.low;
+ add = 64;
+ }
+ return __builtin_clzll(word) + add;
+}
+
+#define Word_LoMask UINT64_C(0x00000000ffffffff)
+#define Word_HiMask UINT64_C(0xffffffff00000000)
+#define Word_FullMask UINT64_C(0xffffffffffffffff)
+#define Word_1(a) (uint64_t)((a >> 96) & Word_LoMask)
+#define Word_2(a) (uint64_t)((a >> 64) & Word_LoMask)
+#define Word_3(a) (uint64_t)((a >> 32) & Word_LoMask)
+#define Word_4(a) (uint64_t)(a & Word_LoMask)
+
+// 128x128 -> 256 wide multiply for platforms that don't have such an operation;
+// many 64-bit platforms have this operation, but they tend to have hardware
+// floating-point, so we don't bother with a special case for them here.
+static inline void wideMultiply(rep_t a, rep_t b, rep_t *hi, rep_t *lo) {
+
+ const uint64_t product11 = Word_1(a) * Word_1(b);
+ const uint64_t product12 = Word_1(a) * Word_2(b);
+ const uint64_t product13 = Word_1(a) * Word_3(b);
+ const uint64_t product14 = Word_1(a) * Word_4(b);
+ const uint64_t product21 = Word_2(a) * Word_1(b);
+ const uint64_t product22 = Word_2(a) * Word_2(b);
+ const uint64_t product23 = Word_2(a) * Word_3(b);
+ const uint64_t product24 = Word_2(a) * Word_4(b);
+ const uint64_t product31 = Word_3(a) * Word_1(b);
+ const uint64_t product32 = Word_3(a) * Word_2(b);
+ const uint64_t product33 = Word_3(a) * Word_3(b);
+ const uint64_t product34 = Word_3(a) * Word_4(b);
+ const uint64_t product41 = Word_4(a) * Word_1(b);
+ const uint64_t product42 = Word_4(a) * Word_2(b);
+ const uint64_t product43 = Word_4(a) * Word_3(b);
+ const uint64_t product44 = Word_4(a) * Word_4(b);
+
+ const __uint128_t sum0 = (__uint128_t)product44;
+ const __uint128_t sum1 = (__uint128_t)product34 +
+ (__uint128_t)product43;
+ const __uint128_t sum2 = (__uint128_t)product24 +
+ (__uint128_t)product33 +
+ (__uint128_t)product42;
+ const __uint128_t sum3 = (__uint128_t)product14 +
+ (__uint128_t)product23 +
+ (__uint128_t)product32 +
+ (__uint128_t)product41;
+ const __uint128_t sum4 = (__uint128_t)product13 +
+ (__uint128_t)product22 +
+ (__uint128_t)product31;
+ const __uint128_t sum5 = (__uint128_t)product12 +
+ (__uint128_t)product21;
+ const __uint128_t sum6 = (__uint128_t)product11;
+
+ const __uint128_t r0 = (sum0 & Word_FullMask) +
+ ((sum1 & Word_LoMask) << 32);
+ const __uint128_t r1 = (sum0 >> 64) +
+ ((sum1 >> 32) & Word_FullMask) +
+ (sum2 & Word_FullMask) +
+ ((sum3 << 32) & Word_HiMask);
+
+ *lo = r0 + (r1 << 64);
+ *hi = (r1 >> 64) +
+ (sum1 >> 96) +
+ (sum2 >> 64) +
+ (sum3 >> 32) +
+ sum4 +
+ (sum5 << 32) +
+ (sum6 << 64);
+}
+#undef Word_1
+#undef Word_2
+#undef Word_3
+#undef Word_4
+#undef Word_HiMask
+#undef Word_LoMask
+#undef Word_FullMask
+#endif // __LDBL_MANT_DIG__ == 113
+#else
+#error SINGLE_PRECISION, DOUBLE_PRECISION or QUAD_PRECISION must be defined.
+#endif
+
+#if defined(SINGLE_PRECISION) || defined(DOUBLE_PRECISION) || defined(CRT_LDBL_128BIT)
+#define typeWidth (sizeof(rep_t)*CHAR_BIT)
+#define exponentBits (typeWidth - significandBits - 1)
+#define maxExponent ((1 << exponentBits) - 1)
+#define exponentBias (maxExponent >> 1)
+
+#define implicitBit (REP_C(1) << significandBits)
+#define significandMask (implicitBit - 1U)
+#define signBit (REP_C(1) << (significandBits + exponentBits))
+#define absMask (signBit - 1U)
+#define exponentMask (absMask ^ significandMask)
+#define oneRep ((rep_t)exponentBias << significandBits)
+#define infRep exponentMask
+#define quietBit (implicitBit >> 1)
+#define qnanRep (exponentMask | quietBit)
+
+static inline rep_t toRep(fp_t x) {
+ const union { fp_t f; rep_t i; } rep = {.f = x};
+ return rep.i;
+}
+
+static inline fp_t fromRep(rep_t x) {
+ const union { fp_t f; rep_t i; } rep = {.i = x};
+ return rep.f;
+}
+
+static inline int normalize(rep_t *significand) {
+ const int shift = rep_clz(*significand) - rep_clz(implicitBit);
+ *significand <<= shift;
+ return 1 - shift;
+}
+
+static inline void wideLeftShift(rep_t *hi, rep_t *lo, int count) {
+ *hi = *hi << count | *lo >> (typeWidth - count);
+ *lo = *lo << count;
+}
+
+static inline void wideRightShiftWithSticky(rep_t *hi, rep_t *lo, unsigned int count) {
+ if (count < typeWidth) {
+ const bool sticky = *lo << (typeWidth - count);
+ *lo = *hi << (typeWidth - count) | *lo >> count | sticky;
+ *hi = *hi >> count;
+ }
+ else if (count < 2*typeWidth) {
+ const bool sticky = *hi << (2*typeWidth - count) | *lo;
+ *lo = *hi >> (count - typeWidth) | sticky;
+ *hi = 0;
+ } else {
+ const bool sticky = *hi | *lo;
+ *lo = sticky;
+ *hi = 0;
+ }
+}
+#endif
+
+#endif // FP_LIB_HEADER
|