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[CRT/ARM] Integer to float conversion implementation (#3866)

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CORE-17713 CORE-17706 CORE-17604
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Roman Masanin 2021-07-28 21:16:04 +03:00 committed by Stanislav Motylkov
parent 6ec6233e9c
commit 9c4e3234ba
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GPG key ID: AFE513258CBA9E92
11 changed files with 160 additions and 104 deletions
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98
sdk/lib/crt/math/arm/__64tof.h Normal file
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@ -0,0 +1,98 @@
/*
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Integer to float conversion (__i64tod/u64tod/i64tos/u64tos)
* COPYRIGHT: Copyright 2021 Roman Masanin <36927roma@gmail.com>
*/
#ifdef _USE_64_BITS_
typedef double FLOAT_TYPE;
typedef unsigned long long FINT_TYPE;
#define FRACTION_LEN 52
#define EXPONENT_LEN 11
#define SHIFT_OFFSET EXPONENT_LEN
#else
typedef float FLOAT_TYPE;
typedef unsigned int FINT_TYPE;
#define FRACTION_LEN 23
#define EXPONENT_LEN 8
#define SHIFT_OFFSET (EXPONENT_LEN + 32)
#endif
#ifdef _USE_SIGNED_
typedef long long INT64SU;
#else
typedef unsigned long long INT64SU;
#endif
typedef union _FLOAT_RESULT
{
FLOAT_TYPE value;
FINT_TYPE raw;
} FLOAT_RESULT;
#define SIGN_MASK 0x8000000000000000ULL
#define EXPONENT_ZERO ((1 << (EXPONENT_LEN - 1)) - 1)
#define NEGATE(x) (~(x) + 1)
FLOAT_TYPE
__64tof(INT64SU value)
{
FLOAT_RESULT result;
FINT_TYPE exponent = EXPONENT_ZERO + FRACTION_LEN;
int count = 0;
unsigned long long mask = SIGN_MASK;
if (value == 0)
return (FLOAT_TYPE)0;
#ifdef _USE_SIGNED_
if (value & SIGN_MASK)
{
value = NEGATE(value);
/* set Sign bit using exponent */
exponent |= 1 << EXPONENT_LEN;
}
#endif
for (; count < 64; count++)
{
if (value & mask)
break;
mask = mask >> 1;
}
count -= SHIFT_OFFSET;
/* exponent is FRACTION_LEN - count */
exponent -= count;
result.raw = exponent << FRACTION_LEN;
mask--;
value = value & mask;
if (value == 0)
return result.value;
if (count == 0)
{
result.raw |= value;
}
else if (count < 0)
{
count = NEGATE(count) - 1;
value = value >> count;
mask = value & 1;
result.raw |= value >> 1;
/* round up if left most bit of lost data is 1 */
if (mask)
result.raw++;
}
else
{
result.raw |= value << count;
}
return result.value;
}

14
sdk/lib/crt/math/arm/__i64tod.c Normal file
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@ -0,0 +1,14 @@
/*
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of __i64tod
* COPYRIGHT: Copyright 2021 Roman Masanin <36927roma@gmail.com>
*/
#define __64tof __i64tod
#define _USE_64_BITS_
#define _USE_SIGNED_
#include "__64tof.h"
/* __i64tod is implemented in __64tof.h */

24
sdk/lib/crt/math/arm/__i64tod.s
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@ -1,24 +0,0 @@
/*
* COPYRIGHT: BSD - See COPYING.ARM in the top level directory
* PROJECT: ReactOS CRT library
* PURPOSE: Implementation of __i64tod
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <kxarm.h>
/* CODE **********************************************************************/
TEXTAREA
LEAF_ENTRY __i64tod
__assertfail
bx lr
LEAF_END __i64tod
END
/* EOF */

13
sdk/lib/crt/math/arm/__i64tos.c Normal file
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@ -0,0 +1,13 @@
/*
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of __i64tos
* COPYRIGHT: Copyright 2021 Roman Masanin <36927roma@gmail.com>
*/
#define __64tof __i64tos
#define _USE_SIGNED_
#include "__64tof.h"
/* __i64tos is implemented in __64tof.h */

24
sdk/lib/crt/math/arm/__i64tos.s
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@ -1,24 +0,0 @@
/*
* COPYRIGHT: BSD - See COPYING.ARM in the top level directory
* PROJECT: ReactOS CRT library
* PURPOSE: Implementation of __i64tos
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <kxarm.h>
/* CODE **********************************************************************/
TEXTAREA
LEAF_ENTRY __i64tos
__assertfail
bx lr
LEAF_END __i64tos
END
/* EOF */

13
sdk/lib/crt/math/arm/__u64tod.c Normal file
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@ -0,0 +1,13 @@
/*
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of __u64tod
* COPYRIGHT: Copyright 2021 Roman Masanin <36927roma@gmail.com>
*/
#define __64tof __u64tod
#define _USE_64_BITS_
#include "__64tof.h"
/* __u64tod is implemented in __64tof.h */

24
sdk/lib/crt/math/arm/__u64tod.s
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@ -1,24 +0,0 @@
/*
* COPYRIGHT: BSD - See COPYING.ARM in the top level directory
* PROJECT: ReactOS CRT library
* PURPOSE: Implementation of __u64tod
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <kxarm.h>
/* CODE **********************************************************************/
TEXTAREA
LEAF_ENTRY __u64tod
__assertfail
bx lr
LEAF_END __u64tod
END
/* EOF */

12
sdk/lib/crt/math/arm/__u64tos.c Normal file
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@ -0,0 +1,12 @@
/*
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Implementation of __u64tos
* COPYRIGHT: Copyright 2021 Roman Masanin <36927roma@gmail.com>
*/
#define __64tof __u64tos
#include "__64tof.h"
/* __u64tos is implemented in __64tof.h */

24
sdk/lib/crt/math/arm/__u64tos.s
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@ -1,24 +0,0 @@
/*
* COPYRIGHT: BSD - See COPYING.ARM in the top level directory
* PROJECT: ReactOS CRT library
* PURPOSE: Implementation of __u64tos
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
*/
/* INCLUDES ******************************************************************/
#include <kxarm.h>
/* CODE **********************************************************************/
TEXTAREA
LEAF_ENTRY __u64tos
__assertfail
bx lr
LEAF_END __u64tos
END
/* EOF */

9
sdk/lib/crt/math/math.cmake
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@ -86,6 +86,11 @@ elseif(ARCH STREQUAL "arm")
math/arm/__stoi64.c
math/arm/__stou64.c
math/arm/__fto64.h
math/arm/__i64tod.c
math/arm/__u64tod.c
math/arm/__i64tos.c
math/arm/__u64tos.c
math/arm/__64tof.h
)
list(APPEND CRT_MATH_SOURCE
math/fabsf.c
@ -103,10 +108,6 @@ elseif(ARCH STREQUAL "arm")
math/arm/log10.s
math/arm/pow.s
math/arm/tan.s
math/arm/__i64tod.s
math/arm/__i64tos.s
math/arm/__u64tod.s
math/arm/__u64tos.s
math/arm/__rt_sdiv64.s
math/arm/__rt_srsh.s
math/arm/__rt_udiv64.s

9
sdk/lib/crt/msvcrtex.cmake
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@ -48,13 +48,14 @@ elseif(ARCH STREQUAL "arm")
math/arm/__stoi64.c
math/arm/__stou64.c
math/arm/__fto64.h
math/arm/__i64tod.c
math/arm/__u64tod.c
math/arm/__i64tos.c
math/arm/__u64tos.c
math/arm/__64tof.h
)
list(APPEND MSVCRTEX_ASM_SOURCE
except/arm/chkstk_asm.s
math/arm/__i64tod.s
math/arm/__i64tos.s
math/arm/__u64tod.s
math/arm/__u64tos.s
math/arm/__rt_sdiv64.s
math/arm/__rt_srsh.s
math/arm/__rt_udiv64.s