1 | /* |
1 | /* |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
2 | * libecb - http://software.schmorp.de/pkg/libecb |
3 | * |
3 | * |
4 | * Copyright (©) 2009-2012 Marc Alexander Lehmann <libecb@schmorp.de> |
4 | * Copyright (©) 2009-2013 Marc Alexander Lehmann <libecb@schmorp.de> |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
5 | * Copyright (©) 2011 Emanuele Giaquinta |
6 | * All rights reserved. |
6 | * All rights reserved. |
7 | * |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * Redistribution and use in source and binary forms, with or without modifica- |
9 | * tion, are permitted provided that the following conditions are met: |
9 | * tion, are permitted provided that the following conditions are met: |
… | |
… | |
29 | |
29 | |
30 | #ifndef ECB_H |
30 | #ifndef ECB_H |
31 | #define ECB_H |
31 | #define ECB_H |
32 | |
32 | |
33 | /* 16 bits major, 16 bits minor */ |
33 | /* 16 bits major, 16 bits minor */ |
34 | #define ECB_VERSION 0x00010001 |
34 | #define ECB_VERSION 0x00010003 |
35 | |
35 | |
36 | #ifdef _WIN32 |
36 | #ifdef _WIN32 |
37 | typedef signed char int8_t; |
37 | typedef signed char int8_t; |
38 | typedef unsigned char uint8_t; |
38 | typedef unsigned char uint8_t; |
39 | typedef signed short int16_t; |
39 | typedef signed short int16_t; |
… | |
… | |
60 | #include <inttypes.h> |
60 | #include <inttypes.h> |
61 | #if UINTMAX_MAX > 0xffffffffU |
61 | #if UINTMAX_MAX > 0xffffffffU |
62 | #define ECB_PTRSIZE 8 |
62 | #define ECB_PTRSIZE 8 |
63 | #else |
63 | #else |
64 | #define ECB_PTRSIZE 4 |
64 | #define ECB_PTRSIZE 4 |
|
|
65 | #endif |
|
|
66 | #endif |
|
|
67 | |
|
|
68 | /* work around x32 idiocy by defining proper macros */ |
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|
69 | #if __x86_64 || _M_AMD64 |
|
|
70 | #if _ILP32 |
|
|
71 | #define ECB_AMD64_X32 1 |
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72 | #else |
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73 | #define ECB_AMD64 1 |
65 | #endif |
74 | #endif |
66 | #endif |
75 | #endif |
67 | |
76 | |
68 | /* many compilers define _GNUC_ to some versions but then only implement |
77 | /* many compilers define _GNUC_ to some versions but then only implement |
69 | * what their idiot authors think are the "more important" extensions, |
78 | * what their idiot authors think are the "more important" extensions, |
… | |
… | |
125 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
134 | || defined __ARM_ARCH_6K__ || defined __ARM_ARCH_6ZK__ |
126 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
135 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mcr p15,0,%0,c7,c10,5" : : "r" (0) : "memory") |
127 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
136 | #elif defined __ARM_ARCH_7__ || defined __ARM_ARCH_7A__ \ |
128 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
137 | || defined __ARM_ARCH_7M__ || defined __ARM_ARCH_7R__ |
129 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
138 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("dmb" : : : "memory") |
130 | #elif __sparc || __sparc__ |
139 | #elif (__sparc || __sparc__) && !__sparcv8 |
131 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
140 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad | #StoreStore | #StoreLoad" : : : "memory") |
132 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
141 | #define ECB_MEMORY_FENCE_ACQUIRE __asm__ __volatile__ ("membar #LoadStore | #LoadLoad" : : : "memory") |
133 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
142 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("membar #LoadStore | #StoreStore") |
134 | #elif defined __s390__ || defined __s390x__ |
143 | #elif defined __s390__ || defined __s390x__ |
135 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
144 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("bcr 15,0" : : : "memory") |
136 | #elif defined __mips__ |
145 | #elif defined __mips__ |
|
|
146 | /* GNU/Linux emulates sync on mips1 architectures, so we force its use */ |
|
|
147 | /* anybody else who still uses mips1 is supposed to send in their version, with detection code. */ |
137 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("sync" : : : "memory") |
148 | #define ECB_MEMORY_FENCE __asm__ __volatile__ (".set mips2; sync; .set mips0" : : : "memory") |
138 | #elif defined __alpha__ |
149 | #elif defined __alpha__ |
139 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
150 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mb" : : : "memory") |
140 | #elif defined __hppa__ |
151 | #elif defined __hppa__ |
141 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
152 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
142 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
153 | #define ECB_MEMORY_FENCE_RELEASE __asm__ __volatile__ ("") |
143 | #elif defined __ia64__ |
154 | #elif defined __ia64__ |
144 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
155 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("mf" : : : "memory") |
|
|
156 | #elif defined __m68k__ |
|
|
157 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
|
|
158 | #elif defined __m88k__ |
|
|
159 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("tb1 0,%%r0,128" : : : "memory") |
|
|
160 | #elif defined __sh__ |
|
|
161 | #define ECB_MEMORY_FENCE __asm__ __volatile__ ("" : : : "memory") |
145 | #endif |
162 | #endif |
146 | #endif |
163 | #endif |
147 | #endif |
164 | #endif |
148 | |
165 | |
149 | #ifndef ECB_MEMORY_FENCE |
166 | #ifndef ECB_MEMORY_FENCE |
150 | #if ECB_GCC_VERSION(4,7) |
167 | #if ECB_GCC_VERSION(4,7) |
151 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
168 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
152 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
169 | #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) |
|
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170 | |
|
|
171 | /* The __has_feature syntax from clang is so misdesigned that we cannot use it |
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|
172 | * without risking compile time errors with other compilers. We *could* |
|
|
173 | * define our own ecb_clang_has_feature, but I just can't be bothered to work |
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|
174 | * around this shit time and again. |
153 | /*#elif defined __clang && __has_feature (cxx_atomic)*/ |
175 | * #elif defined __clang && __has_feature (cxx_atomic) |
154 | /* see comment below (stdatomic.h) about the C11 memory model. */ |
176 | * // see comment below (stdatomic.h) about the C11 memory model. |
155 | /*#define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST)*/ |
177 | * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) |
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178 | */ |
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179 | |
156 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
180 | #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ |
157 | #define ECB_MEMORY_FENCE __sync_synchronize () |
181 | #define ECB_MEMORY_FENCE __sync_synchronize () |
158 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
182 | #elif _MSC_VER >= 1400 /* VC++ 2005 */ |
159 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
183 | #pragma intrinsic(_ReadBarrier,_WriteBarrier,_ReadWriteBarrier) |
160 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
184 | #define ECB_MEMORY_FENCE _ReadWriteBarrier () |
… | |
… | |
475 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
499 | ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; |
476 | ecb_inline unsigned char |
500 | ecb_inline unsigned char |
477 | ecb_byteorder_helper (void) |
501 | ecb_byteorder_helper (void) |
478 | { |
502 | { |
479 | /* the union code still generates code under pressure in gcc, */ |
503 | /* the union code still generates code under pressure in gcc, */ |
480 | /* but less than using pointers, and always seem to */ |
504 | /* but less than using pointers, and always seems to */ |
481 | /* successfully return a constant. */ |
505 | /* successfully return a constant. */ |
482 | /* the reason why we have this horrible preprocessor mess */ |
506 | /* the reason why we have this horrible preprocessor mess */ |
483 | /* is to avoid it in all cases, at least on common architectures */ |
507 | /* is to avoid it in all cases, at least on common architectures */ |
484 | /* and yes, gcc defines __BYTE_ORDER__, g++ does not */ |
508 | /* or when using a recent enough gcc version (>= 4.6) */ |
485 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
509 | #if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 |
486 | return 0x44; |
510 | return 0x44; |
487 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
511 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ |
488 | return 0x44; |
512 | return 0x44; |
489 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
513 | #elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
490 | retrurn 0x11; |
514 | return 0x11; |
491 | #else |
515 | #else |
492 | union |
516 | union |
493 | { |
517 | { |
494 | uint32_t i; |
518 | uint32_t i; |
495 | uint8_t c; |
519 | uint8_t c; |
… | |
… | |
534 | } |
558 | } |
535 | #else |
559 | #else |
536 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
560 | #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) |
537 | #endif |
561 | #endif |
538 | |
562 | |
539 | #if __STDC_IEC_559__ |
563 | /*******************************************************************************/ |
540 | // we assume this is defined for most C and many C++ compilers |
564 | /* floating point stuff, can be disabled by defining ECB_NO_LIBM */ |
541 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
565 | |
542 | ecb_inline ecb_bool ecb_float_ieee (void) { return 1; } |
566 | /* basically, everything uses "ieee pure-endian" floating point numbers */ |
543 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
567 | /* the only noteworthy exception is ancient armle, which uses order 43218765 */ |
544 | ecb_inline ecb_bool ecb_double_ieee (void) { return 1; } |
568 | #if 0 \ |
545 | #elif ECB_CPP |
569 | || __i386 || __i386__ \ |
546 | #include <limits> |
570 | || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ |
547 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
571 | || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ |
548 | ecb_inline ecb_bool ecb_float_ieee (void) { return std::numeric_limits<float >::is_iec559; } |
572 | || defined __arm__ && defined __ARM_EABI__ \ |
549 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
573 | || defined __s390__ || defined __s390x__ \ |
550 | ecb_inline ecb_bool ecb_double_ieee (void) { return std::numeric_limits<double>::is_iec559; } |
574 | || defined __mips__ \ |
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|
575 | || defined __alpha__ \ |
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|
576 | || defined __hppa__ \ |
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|
577 | || defined __ia64__ \ |
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|
578 | || defined __m68k__ \ |
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|
579 | || defined __m88k__ \ |
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|
580 | || defined __sh__ \ |
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|
581 | || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 |
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|
582 | #define ECB_STDFP 1 |
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|
583 | #include <string.h> /* for memcpy */ |
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|
584 | #else |
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585 | #define ECB_STDFP 0 |
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586 | #endif |
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587 | |
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|
588 | #ifndef ECB_NO_LIBM |
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589 | |
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590 | #include <math.h> /* for frexp*, ldexp*, INFINITY, NAN */ |
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591 | |
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592 | /* only the oldest of old doesn't have this one. solaris. */ |
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593 | #ifdef INFINITY |
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|
594 | #define ECB_INFINITY INFINITY |
551 | #else |
595 | #else |
552 | ecb_inline ecb_bool ecb_float_ieee (void) ecb_const; |
596 | #define ECB_INFINITY HUGE_VAL |
553 | ecb_inline ecb_bool ecb_float_ieee (void) { return 0; } |
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|
554 | ecb_inline ecb_bool ecb_double_ieee (void) ecb_const; |
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|
555 | ecb_inline ecb_bool ecb_double_ieee (void) { return 0; } |
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|
556 | #endif |
597 | #endif |
557 | |
598 | |
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|
599 | #ifdef NAN |
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|
600 | #define ECB_NAN NAN |
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|
601 | #else |
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|
602 | #define ECB_NAN ECB_INFINITY |
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|
603 | #endif |
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|
604 | |
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|
605 | /* converts an ieee half/binary16 to a float */ |
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606 | ecb_function_ float ecb_binary16_to_float (uint16_t x) ecb_const; |
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607 | ecb_function_ float |
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608 | ecb_binary16_to_float (uint16_t x) |
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609 | { |
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610 | int e = (x >> 10) & 0x1f; |
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611 | int m = x & 0x3ff; |
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612 | float r; |
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613 | |
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614 | if (!e ) r = ldexpf (m , -24); |
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615 | else if (e != 31) r = ldexpf (m + 0x400, e - 25); |
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616 | else if (m ) r = ECB_NAN; |
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|
617 | else r = ECB_INFINITY; |
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|
618 | |
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619 | return x & 0x8000 ? -r : r; |
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|
620 | } |
|
|
621 | |
558 | // convert a float to ieee single/binary32 |
622 | /* convert a float to ieee single/binary32 */ |
559 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
623 | ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; |
560 | ecb_function_ uint32_t |
624 | ecb_function_ uint32_t |
561 | ecb_float_to_binary32 (float x) |
625 | ecb_float_to_binary32 (float x) |
562 | { |
626 | { |
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|
627 | uint32_t r; |
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628 | |
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629 | #if ECB_STDFP |
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630 | memcpy (&r, &x, 4); |
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|
631 | #else |
563 | /* slow emulation, works for anything but nan's and -0 */ |
632 | /* slow emulation, works for anything but -0 */ |
564 | ECB_EXTERN_C float frexpf (float v, int *e); |
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|
565 | uint32_t r, m; |
633 | uint32_t m; |
566 | int e; |
634 | int e; |
567 | |
635 | |
568 | if (x == 0e0f ) return 0; |
636 | if (x == 0e0f ) return 0x00000000U; |
569 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
637 | if (x > +3.40282346638528860e+38f) return 0x7f800000U; |
570 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
638 | if (x < -3.40282346638528860e+38f) return 0xff800000U; |
|
|
639 | if (x != x ) return 0x7fbfffffU; |
571 | |
640 | |
572 | m = frexpf (x, &e) * 0x1000000U; |
641 | m = frexpf (x, &e) * 0x1000000U; |
573 | |
642 | |
574 | r = m & 0x80000000U; |
643 | r = m & 0x80000000U; |
575 | |
644 | |
576 | if (r) |
645 | if (r) |
577 | m = -m; |
646 | m = -m; |
578 | |
647 | |
579 | if (e < -125) |
648 | if (e <= -126) |
580 | { |
649 | { |
581 | m &= 0xffffffU; |
650 | m &= 0xffffffU; |
582 | m >>= (-125 - e); |
651 | m >>= (-125 - e); |
583 | e = -126; |
652 | e = -126; |
584 | } |
653 | } |
585 | |
654 | |
586 | r |= (e + 126) << 23; |
655 | r |= (e + 126) << 23; |
587 | r |= m & 0x7fffffU; |
656 | r |= m & 0x7fffffU; |
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|
657 | #endif |
588 | |
658 | |
589 | return r; |
659 | return r; |
590 | } |
660 | } |
591 | |
661 | |
592 | // converts a ieee single/binary32 to a float |
662 | /* converts an ieee single/binary32 to a float */ |
593 | ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; |
663 | ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; |
594 | ecb_function_ float |
664 | ecb_function_ float |
595 | ecb_binary32_to_float (uint32_t x) |
665 | ecb_binary32_to_float (uint32_t x) |
596 | { |
666 | { |
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667 | float r; |
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|
668 | |
|
|
669 | #if ECB_STDFP |
|
|
670 | memcpy (&r, &x, 4); |
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|
671 | #else |
597 | /* emulation, only works for normals and subnormals and +0 */ |
672 | /* emulation, only works for normals and subnormals and +0 */ |
598 | ECB_EXTERN_C float ldexpf (float x, int e); |
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599 | |
|
|
600 | int neg = x >> 31; |
673 | int neg = x >> 31; |
601 | int e = (x >> 23) & 0xffU; |
674 | int e = (x >> 23) & 0xffU; |
602 | float r; |
|
|
603 | |
675 | |
604 | x &= 0x7fffffU; |
676 | x &= 0x7fffffU; |
605 | |
677 | |
606 | if (e) |
678 | if (e) |
607 | x |= 0x800000U; |
679 | x |= 0x800000U; |
|
|
680 | else |
|
|
681 | e = 1; |
608 | |
682 | |
609 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
683 | /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ |
610 | r = ldexpf (x * (1.f / 0x1000000U), e - 126); |
684 | r = ldexpf (x * (0.5f / 0x800000U), e - 126); |
611 | |
685 | |
612 | return neg ? -r : r; |
686 | r = neg ? -r : r; |
613 | } |
687 | #endif |
614 | |
688 | |
|
|
689 | return r; |
|
|
690 | } |
|
|
691 | |
|
|
692 | /* convert a double to ieee double/binary64 */ |
615 | ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; |
693 | ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; |
616 | ecb_function_ uint64_t |
694 | ecb_function_ uint64_t |
617 | ecb_double_to_binary64 (double x) |
695 | ecb_double_to_binary64 (double x) |
618 | { |
696 | { |
619 | } |
697 | uint64_t r; |
620 | |
698 | |
|
|
699 | #if ECB_STDFP |
|
|
700 | memcpy (&r, &x, 8); |
|
|
701 | #else |
|
|
702 | /* slow emulation, works for anything but -0 */ |
|
|
703 | uint64_t m; |
|
|
704 | int e; |
|
|
705 | |
|
|
706 | if (x == 0e0 ) return 0x0000000000000000U; |
|
|
707 | if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; |
|
|
708 | if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; |
|
|
709 | if (x != x ) return 0X7ff7ffffffffffffU; |
|
|
710 | |
|
|
711 | m = frexp (x, &e) * 0x20000000000000U; |
|
|
712 | |
|
|
713 | r = m & 0x8000000000000000;; |
|
|
714 | |
|
|
715 | if (r) |
|
|
716 | m = -m; |
|
|
717 | |
|
|
718 | if (e <= -1022) |
|
|
719 | { |
|
|
720 | m &= 0x1fffffffffffffU; |
|
|
721 | m >>= (-1021 - e); |
|
|
722 | e = -1022; |
|
|
723 | } |
|
|
724 | |
|
|
725 | r |= ((uint64_t)(e + 1022)) << 52; |
|
|
726 | r |= m & 0xfffffffffffffU; |
621 | #endif |
727 | #endif |
622 | |
728 | |
|
|
729 | return r; |
|
|
730 | } |
|
|
731 | |
|
|
732 | /* converts an ieee double/binary64 to a double */ |
|
|
733 | ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const; |
|
|
734 | ecb_function_ double |
|
|
735 | ecb_binary64_to_double (uint64_t x) |
|
|
736 | { |
|
|
737 | double r; |
|
|
738 | |
|
|
739 | #if ECB_STDFP |
|
|
740 | memcpy (&r, &x, 8); |
|
|
741 | #else |
|
|
742 | /* emulation, only works for normals and subnormals and +0 */ |
|
|
743 | int neg = x >> 63; |
|
|
744 | int e = (x >> 52) & 0x7ffU; |
|
|
745 | |
|
|
746 | x &= 0xfffffffffffffU; |
|
|
747 | |
|
|
748 | if (e) |
|
|
749 | x |= 0x10000000000000U; |
|
|
750 | else |
|
|
751 | e = 1; |
|
|
752 | |
|
|
753 | /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ |
|
|
754 | r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); |
|
|
755 | |
|
|
756 | r = neg ? -r : r; |
|
|
757 | #endif |
|
|
758 | |
|
|
759 | return r; |
|
|
760 | } |
|
|
761 | |
|
|
762 | #endif |
|
|
763 | |
|
|
764 | #endif |
|
|
765 | |