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[PSDK]

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When I wrote "the compiler can optimize this better" I was obviously referring to a sane compiler like MSVC. Optimize (U)Int32x32To64 on x86 GCC builds by using __emul(u), since the native math results in horribly inefficient code doing 3 multiplications and some shifts.

svn path=/trunk/; revision=65480
This commit is contained in:
Timo Kreuzer 2014-11-25 09:08:34 +00:00
parent 10d2eaf33b
commit c6f12ff6ba
3 changed files with 27 additions and 16 deletions
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13
reactos/include/psdk/ntdef.h
View file

@ -828,10 +828,15 @@ extern "C++" { \
#define MAXULONG 0xffffffff
#define MAXLONGLONG (0x7fffffffffffffffLL)
/* Multiplication and Shift Operations. Note: we don't use inline
asm functions, the compiler can optimize this better. */
#define Int32x32To64(a,b) (((__int64)(long)(a))*((__int64)(long)(b)))
#define UInt32x32To64(a,b) ((unsigned __int64)(unsigned int)(a)*(unsigned __int64)(unsigned int)(b))
/* 32 to 64 bit multiplication. GCC is really bad at optimizing the native math */
#if defined(_M_IX86) && defined(__GNUC__) && \
!defined(MIDL_PASS)&& !defined(RC_INVOKED) && !defined(_M_CEE_PURE)
#define Int32x32To64(a,b) __emul(a,b)
#define UInt32x32To64(a,b) __emulu(a,b)
#else
#define Int32x32To64(a,b) (((__int64)(long)(a))*((__int64)(long)(b)))
#define UInt32x32To64(a,b) ((unsigned __int64)(unsigned int)(a)*(unsigned __int64)(unsigned int)(b))
#endif
#if defined(MIDL_PASS)|| defined(RC_INVOKED) || defined(_M_CEE_PURE)
/* Use native math */

17
reactos/include/psdk/winnt.h
View file

@ -761,10 +761,15 @@ extern "C++" { \
#define MAXDWORD 0xffffffff
#define MAXLONGLONG (0x7fffffffffffffffLL)
/* Multiplication and Shift Operations. Note: we don't use inline
asm functions, the compiler can optimize this better. */
#define Int32x32To64(a,b) (((__int64)(long)(a))*((__int64)(long)(b)))
#define UInt32x32To64(a,b) ((unsigned __int64)(unsigned int)(a)*(unsigned __int64)(unsigned int)(b))
/* 32 to 64 bit multiplication. GCC is really bad at optimizing the native math */
#if defined(_M_IX86) && defined(__GNUC__) && \
!defined(MIDL_PASS)&& !defined(RC_INVOKED) && !defined(_M_CEE_PURE)
#define Int32x32To64(a,b) __emul(a,b)
#define UInt32x32To64(a,b) __emulu(a,b)
#else
#define Int32x32To64(a,b) (((__int64)(long)(a))*((__int64)(long)(b)))
#define UInt32x32To64(a,b) ((unsigned __int64)(unsigned int)(a)*(unsigned __int64)(unsigned int)(b))
#endif
#if defined(MIDL_PASS)|| defined(RC_INVOKED) || defined(_M_CEE_PURE)
/* Use native math */
@ -1709,10 +1714,6 @@ extern "C++" { \
#define THREAD_BASE_PRIORITY_MAX 2
#define THREAD_BASE_PRIORITY_MIN (-2)
#define THREAD_BASE_PRIORITY_IDLE (-15)
#define PROCESS_SET_LIMITED_INFORMATION 0x2000
#define THREAD_RESUME 0x1000
/*
* To prevent gcc compiler warnings, bracket these defines when initialising
* a SID_IDENTIFIER_AUTHORITY, eg.

13
reactos/include/xdk/ntbasedef.h
View file

@ -747,10 +747,15 @@ $if(_WINNT_)
$endif(_WINNT_)
#define MAXLONGLONG (0x7fffffffffffffffLL)
/* Multiplication and Shift Operations. Note: we don't use inline
asm functions, the compiler can optimize this better. */
#define Int32x32To64(a,b) (((__int64)(long)(a))*((__int64)(long)(b)))
#define UInt32x32To64(a,b) ((unsigned __int64)(unsigned int)(a)*(unsigned __int64)(unsigned int)(b))
/* 32 to 64 bit multiplication. GCC is really bad at optimizing the native math */
#if defined(_M_IX86) && defined(__GNUC__) && \
!defined(MIDL_PASS)&& !defined(RC_INVOKED) && !defined(_M_CEE_PURE)
#define Int32x32To64(a,b) __emul(a,b)
#define UInt32x32To64(a,b) __emulu(a,b)
#else
#define Int32x32To64(a,b) (((__int64)(long)(a))*((__int64)(long)(b)))
#define UInt32x32To64(a,b) ((unsigned __int64)(unsigned int)(a)*(unsigned __int64)(unsigned int)(b))
#endif
#if defined(MIDL_PASS)|| defined(RC_INVOKED) || defined(_M_CEE_PURE)
/* Use native math */