[sginsberg] 42378: - Remove asm-optimized versions of RtlRandom and RtlUniform -- there is *no* reason to use hand-optimized assembly for simple routines like these -- let the compiler do its job, please. Also, we compiled random.c *and* random_asm.S, meaning we duplicated the functions -- the compiler didn't detect this and silently used the C versions. - Don't forward RtlRandomEx to RtlRandom in ntdll -- RtlRandomEx should use a different algorithm (but is simply a copy of RtlRandom right now)
4 Aug
2009
4 Aug
'09
11:22 a.m.
Author: sginsberg
Date: Tue Aug 4 13:22:50 2009
New Revision: 42378
URL: http://svn.reactos.org/svn/reactos?rev=42378&view=rev
Log:
- Remove asm-optimized versions of RtlRandom and RtlUniform -- there is *no* reason to use
hand-optimized assembly for simple routines like these -- let the compiler do its job,
please. Also, we compiled random.c *and* random_asm.S, meaning we duplicated the functions
-- the compiler didn't detect this and silently used the C versions.
- Don't forward RtlRandomEx to RtlRandom in ntdll -- RtlRandomEx should use a
different algorithm (but is simply a copy of RtlRandom right now).
- Revert RtlUniform back to the "slow" version -- let the compiler do its job
instead of obfuscating code for a miniscule speed gain.
Removed:
trunk/reactos/lib/rtl/i386/random_asm.S
Modified:
trunk/reactos/dll/ntdll/def/ntdll_arm.def
trunk/reactos/dll/ntdll/def/ntdll_i386.def
trunk/reactos/lib/rtl/random.c
trunk/reactos/lib/rtl/rtl.rbuild
Modified: trunk/reactos/dll/ntdll/def/ntdll_arm.def
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/ntdll/def/ntdll_arm.de…
==============================================================================
--- trunk/reactos/dll/ntdll/def/ntdll_arm.def [iso-8859-1] (original)
+++ trunk/reactos/dll/ntdll/def/ntdll_arm.def [iso-8859-1] Tue Aug 4 13:22:50 2009
@@ -621,7 +621,7 @@
RtlRaiseException
RtlRaiseStatus
RtlRandom
-RtlRandomEx=RtlRandom
+RtlRandomEx
RtlReAllocateHeap
RtlRealPredecessor
RtlRealSuccessor
Modified: trunk/reactos/dll/ntdll/def/ntdll_i386.def
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/ntdll/def/ntdll_i386.d…
==============================================================================
--- trunk/reactos/dll/ntdll/def/ntdll_i386.def [iso-8859-1] (original)
+++ trunk/reactos/dll/ntdll/def/ntdll_i386.def [iso-8859-1] Tue Aug 4 13:22:50 2009
@@ -827,7 +827,7 @@
RtlRaiseException@4
RtlRaiseStatus@4
RtlRandom@4
-RtlRandomEx=RtlRandom@4
+RtlRandomEx@4
RtlReAllocateHeap@16
;RtlReadMemoryStream
;RtlReadOutOfProcessMemoryStream
Removed: trunk/reactos/lib/rtl/i386/random_asm.S
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/i386/random_asm.S?…
==============================================================================
--- trunk/reactos/lib/rtl/i386/random_asm.S [iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/i386/random_asm.S (removed)
@@ -1,245 +1,0 @@
-/*
- * COPYRIGHT: See COPYING in the top level directory
- * PROJECT: ReactOS kernel
- * FILE: ranom.asm
- * PURPOSE: Random number generator functions
- * PROGRAMMER: Magnus Olsen (magnusolsen(a)greatlord.com)
- * UPDATE HISTORY:
- * Created 27/07/2005
- */
-
-.intel_syntax noprefix
-
-/* GLOBALS ****************************************************************/
-
-.globl _RtlRandom@4 // [1] (no bug) (max optimze code)
-.globl _RtlUniform@4 // [2] (no bug) (max optimze code)
-.globl _SavedValue // [3] (no bug) (max optimze code)
-
-/* FUNCTIONS ***************************************************************/
-
-_RtlRandom@4:
- // load pointer
- mov ecx,[esp+4]
- mov eax,[ecx]
-
- // Result = *Seed * 0xffffffed + 0x7fffffc3 // take now 3 cycles
- lea edx,[eax + eax * 8]
-
- lea eax,[eax + edx * 2 + 2147483709 ] // + 2147483709
- neg eax
-
- cmp eax,-1
- je .RtlRandom_Rand1
- cmp eax, 2147483646
- je .RtlRandom_Rand1
-
- cmp eax, 2147483647
- je .RtlRandom_Rand2
-
- test eax,eax
- jns .RtlRandom_Rand3
-
- // else {
- mov edx,eax
- and edx,1
- add eax,edx
- and eax,2147483647
- mov [ecx],eax
- jmp .RtlRandom_Seed
-
-.RtlRandom_Rand1:
- // if (Result == 0xffffffff || Result == 0x7ffffffe)
- add eax, 2
- and eax, 2147483647
- mov [ecx],eax
- jmp .RtlRandom_Seed
-
-.RtlRandom_Rand2:
- // else if (Result == 0x7fffffff)
- xor eax,eax
- mov [ecx],eax
- jmp .RtlRandom_Seed
-
-.RtlRandom_Rand3:
- // else if ((Result & 0x80000000) == 0)
- mov edx,eax
- xor edx,-1 // not edx lock all clock until it finsish, but xor does not do that
- and edx,1
- add eax,edx
- mov [ecx],eax
-
-.RtlRandom_Seed:
- mov eax,[ecx]
-
- // Result = *Seed * 0xffffffed + 0x7fffffc3 // take now 3 cycles
- lea edx,[eax + eax * 8]
-
- lea eax,[eax + edx * 2 + 2147483709 ] // + 2147483709 09-18
- neg eax
-
- cmp eax,-1
- je .RtlRandom_Seed1
- cmp eax, 2147483646
- je .RtlRandom_Seed1
-
- cmp eax, 2147483647
- je .RtlRandom_Seed2
-
- test eax,eax
- jns .RtlRandom_Seed3
-
- // else {
- mov edx,eax
- and edx,1
- add eax,edx
- and eax,2147483647
-
- // end
- mov edx,[ecx]
- mov [ecx],eax
-
- mov ecx,eax // pos
- and ecx, 0x7f // pos = seed & 0x7f
- mov eax,ecx//
- mov eax, [_SavedValue + ecx*4]
- mov [_SavedValue + ecx*4], edx
- ret 4
-
-.RtlRandom_Seed1:
- // if (Result == 0xffffffff || Result == 0x7ffffffe)
- add eax, 2
- and eax, 2147483647
-
- // end
- mov edx,[ecx]
- mov [ecx],eax
-
- mov ecx,eax // pos
- and ecx, 0x7f // pos = seed & 0x7f
- mov eax,ecx//
- mov eax, [_SavedValue + ecx*4]
- mov [_SavedValue + ecx*4], edx
- ret 4
-
-.RtlRandom_Seed2:
- // else if (Result == 0x7fffffff)
- xor eax,eax
-
- // end
- mov edx,[ecx]
- mov [ecx],eax
-
- mov ecx,eax // pos
- and ecx, 0x7f // pos = seed & 0x7f
- mov eax,ecx//
- mov eax, [_SavedValue + ecx*4]
- mov [_SavedValue + ecx*4], edx
- ret 4
-
-.RtlRandom_Seed3:
- // else if ((Result & 0x80000000) == 0)
- mov edx,eax
- xor edx,-1 // not edx lock all clock until it finsish, but xor does not do that
- and edx,1
- add eax,edx
-
- // end
- mov edx,[ecx]
- mov [ecx],eax
-
- mov ecx,eax // pos
- and ecx, 0x7f // pos = seed & 0x7f
- mov eax,ecx//
- mov eax, [_SavedValue + ecx*4]
- mov [_SavedValue + ecx*4], edx
- ret 4
-
-// prototype: ULONG STDCALL RtlUniform (PULONG Seed)
-_RtlUniform@4:
- // load pointer
- mov ecx,[esp+4]
- mov eax,[ecx]
-
- // Result = *Seed * 0xffffffed + 0x7fffffc3 // take now 3 cycles
- lea edx,[eax + eax * 8]
-
- lea eax,[eax + edx * 2 + 2147483709 ] // + 2147483709 09-18
- neg eax
-
- cmp eax,-1
- je .RtlUniform_jump1
- cmp eax, 2147483646
- je .RtlUniform_jump1
-
- cmp eax, 2147483647
- je .RtlUniform_jump2
-
- test eax,eax
- jns .RtlUniform_jump3
-
- // else {
- mov edx,eax
- and edx,1
- add eax,edx
- and eax,2147483647
- mov [ecx],eax
- ret 4
-
-.RtlUniform_jump1:
- // if (Result == 0xffffffff || Result == 0x7ffffffe)
- add eax, 2
- and eax, 2147483647
- mov [ecx],eax
- ret 4
-
-.RtlUniform_jump2:
- // else if (Result == 0x7fffffff)
- xor eax,eax
- mov [ecx],eax
- ret 4
-
-.RtlUniform_jump3:
- // else if ((Result & 0x80000000) == 0)
- mov edx,eax
- xor edx,-1 // not edx lock all clock until it finsish, but xor does not do that
- and edx,1
- add eax,edx
- mov [ecx],eax
- ret 4
-
-.data
-// SavedValue[128]
-_SavedValue:
- .long 0x4c8bc0aa, 0x4c022957, 0x2232827a, 0x2f1e7626
- .long 0x7f8bdafb, 0x5c37d02a, 0x0ab48f72, 0x2f0c4ffa
- .long 0x290e1954, 0x6b635f23, 0x5d3885c0, 0x74b49ff8
- .long 0x5155fa54, 0x6214ad3f, 0x111e9c29, 0x242a3a09
- .long 0x75932ae1, 0x40ac432e, 0x54f7ba7a, 0x585ccbd5
- .long 0x6df5c727, 0x0374dad1, 0x7112b3f1, 0x735fc311
- .long 0x404331a9, 0x74d97781, 0x64495118, 0x323e04be
- .long 0x5974b425, 0x4862e393, 0x62389c1d, 0x28a68b82
- .long 0x0f95da37, 0x7a50bbc6, 0x09b0091c, 0x22cdb7b4
- .long 0x4faaed26, 0x66417ccd, 0x189e4bfa, 0x1ce4e8dd
- .long 0x5274c742, 0x3bdcf4dc, 0x2d94e907, 0x32eac016
- .long 0x26d33ca3, 0x60415a8a, 0x31f57880, 0x68c8aa52
- .long 0x23eb16da, 0x6204f4a1, 0x373927c1, 0x0d24eb7c
- .long 0x06dd7379, 0x2b3be507, 0x0f9c55b1, 0x2c7925eb
- .long 0x36d67c9a, 0x42f831d9, 0x5e3961cb, 0x65d637a8
- .long 0x24bb3820, 0x4d08e33d, 0x2188754f, 0x147e409e
- .long 0x6a9620a0, 0x62e26657, 0x7bd8ce81, 0x11da0abb
- .long 0x5f9e7b50, 0x23e444b6, 0x25920c78, 0x5fc894f0
- .long 0x5e338cbb, 0x404237fd, 0x1d60f80f, 0x320a1743
- .long 0x76013d2b, 0x070294ee, 0x695e243b, 0x56b177fd
- .long 0x752492e1, 0x6decd52f, 0x125f5219, 0x139d2e78
- .long 0x1898d11e, 0x2f7ee785, 0x4db405d8, 0x1a028a35
- .long 0x63f6f323, 0x1f6d0078, 0x307cfd67, 0x3f32a78a
- .long 0x6980796c, 0x462b3d83, 0x34b639f2, 0x53fce379
- .long 0x74ba50f4, 0x1abc2c4b, 0x5eeaeb8d, 0x335a7a0d
- .long 0x3973dd20, 0x0462d66b, 0x159813ff, 0x1e4643fd
- .long 0x06bc5c62, 0x3115e3fc, 0x09101613, 0x47af2515
- .long 0x4f11ec54, 0x78b99911, 0x3db8dd44, 0x1ec10b9b
- .long 0x5b5506ca, 0x773ce092, 0x567be81a, 0x5475b975
- .long 0x7a2cde1a, 0x494536f5, 0x34737bb4, 0x76d9750b
- .long 0x2a1f6232, 0x2e49644d, 0x7dddcbe7, 0x500cebdb
- .long 0x619dab9e, 0x48c626fe, 0x1cda3193, 0x52dabe9d
Modified: trunk/reactos/lib/rtl/random.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/random.c?rev=42378…
==============================================================================
--- trunk/reactos/lib/rtl/random.c [iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/random.c [iso-8859-1] Tue Aug 4 13:22:50 2009
@@ -132,37 +132,16 @@
* function and our function return a random number uniformly
* distributed over [0..MAXLONG-1].
*/
-ULONG NTAPI
-RtlUniform (PULONG Seed)
+ULONG
+NTAPI
+RtlUniform(IN PULONG Seed)
{
- ULONG Result;
+ ULONG Result;
- /*
- * Instead of the algorithm stated above, we use the algorithm
- * below, which is totally equivalent (see the tests), but does
- * not use a division and therefore is faster.
- */
- Result = *Seed * 0xffffffed + 0x7fffffc3;
+ /* Generate the random number */
+ Result = (*Seed * 0x7fffffed + 0x7fffffc3) % MAXLONG;
- if (Result == 0xffffffff || Result == 0x7ffffffe)
- {
- Result = (Result + 2) & MAXLONG;
- }
- else if (Result == 0x7fffffff)
- {
- Result = 0;
- }
- else if ((Result & 0x80000000) == 0)
- {
- Result = Result + (~Result & 1);
- }
- else
- {
- Result = (Result + (Result & 1)) & MAXLONG;
- }
-
- *Seed = Result;
-
- return Result;
+ /* Return it */
+ *Seed = Result;
+ return Result;
}
-/* EOF */
Modified: trunk/reactos/lib/rtl/rtl.rbuild
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/rtl.rbuild?rev=423…
==============================================================================
--- trunk/reactos/lib/rtl/rtl.rbuild [iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/rtl.rbuild [iso-8859-1] Tue Aug 4 13:22:50 2009
@@ -13,7 +13,6 @@
<file>except_asm.s</file>
<file>except.c</file>
<file>interlck.S</file>
- <file>random_asm.S</file>
<file>rtlswap.S</file>
<file>rtlmem.s</file>
<file>res_asm.s</file>
5580
days inactive
5580
days old
0 comments
1 participants
participants (1)
-
sginsberg＠svn.reactos.org