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[CRT]

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- Make all x86assembly ML compatible
- Remove memcpy, it was duplicated from memmove, copy the label instead
- Guard some code against compilation on msvc, as these functions are intrinsics on MSVC and cannot be implemented
- Fix some x64 assembly (don't modify stack below rsp)

svn path=/branches/cmake-bringup/; revision=49421
This commit is contained in:
Timo Kreuzer 2010-11-02 00:06:33 +00:00
parent 0d7a1c46a0
commit a3623f23de
49 changed files with 912 additions and 918 deletions
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51
lib/sdk/crt/math/i386/alldvrm_asm.s
View file

@ -33,12 +33,13 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
.globl __alldvrm
.intel_syntax noprefix
#include <reactos/asm.h>
PUBLIC __alldvrm
/* FUNCTIONS ***************************************************************/
.code
__alldvrm:
push edi
@ -88,7 +89,7 @@ __alldvrm:
mov eax,DVNDHI // hi word of a
or eax,eax // test to see if signed
jge short ....L1 // skip rest if a is already positive
jge short .L1 // skip rest if a is already positive
inc edi // complement result sign flag
inc ebp // complement result sign flag
mov edx,DVNDLO // lo word of a
@ -97,10 +98,10 @@ __alldvrm:
sbb eax,0
mov DVNDHI,eax // save positive value
mov DVNDLO,edx
....L1:
.L1:
mov eax,DVSRHI // hi word of b
or eax,eax // test to see if signed
jge short ....L2 // skip rest if b is already positive
jge short .L2 // skip rest if b is already positive
inc edi // complement the result sign flag
mov edx,DVSRLO // lo word of a
neg eax // make b positive
@ -108,7 +109,7 @@ __alldvrm:
sbb eax,0
mov DVSRHI,eax // save positive value
mov DVSRLO,edx
....L2:
.L2:
//
// Now do the divide. First look to see if the divisor is less than 4194304K.
@ -119,7 +120,7 @@ __alldvrm:
//
or eax,eax // check to see if divisor < 4194304K
jnz short ....L3 // nope, gotta do this the hard way
jnz short .L3 // nope, gotta do this the hard way
mov ecx,DVSRLO // load divisor
mov eax,DVNDHI // load high word of dividend
xor edx,edx
@ -137,24 +138,24 @@ __alldvrm:
mov eax,esi // set up low word of quotient
mul dword ptr DVSRLO // LOWORD(QUOT) * DVSR
add edx,ecx // EDX:EAX = QUOT * DVSR
jmp short ....L4 // complete remainder calculation
jmp short .L4 // complete remainder calculation
//
// Here we do it the hard way. Remember, eax contains the high word of DVSR
//
....L3:
.L3:
mov ebx,eax // ebx:ecx <- divisor
mov ecx,DVSRLO
mov edx,DVNDHI // edx:eax <- dividend
mov eax,DVNDLO
....L5:
.L5:
shr ebx,1 // shift divisor right one bit
rcr ecx,1
shr edx,1 // shift dividend right one bit
rcr eax,1
or ebx,ebx
jnz short ....L5 // loop until divisor < 4194304K
jnz short .L5 // loop until divisor < 4194304K
div ecx // now divide, ignore remainder
mov esi,eax // save quotient
@ -170,7 +171,7 @@ __alldvrm:
mov eax,DVSRLO
mul esi // QUOT * DVSRLO
add edx,ecx // EDX:EAX = QUOT * DVSR
jc short ....L6 // carry means Quotient is off by 1
jc short .L6 // carry means Quotient is off by 1
//
// do long compare here between original dividend and the result of the
@ -179,18 +180,18 @@ __alldvrm:
//
cmp edx,DVNDHI // compare hi words of result and original
ja short ....L6 // if result > original, do subtract
jb short ....L7 // if result < original, we are ok
ja short .L6 // if result > original, do subtract
jb short .L7 // if result < original, we are ok
cmp eax,DVNDLO // hi words are equal, compare lo words
jbe short ....L7 // if less or equal we are ok, else subtract
....L6:
jbe short .L7 // if less or equal we are ok, else subtract
.L6:
dec esi // subtract 1 from quotient
sub eax,DVSRLO // subtract divisor from result
sbb edx,DVSRHI
....L7:
.L7:
xor ebx,ebx // ebx:esi <- quotient
....L4:
.L4:
//
// Calculate remainder by subtracting the result from the original dividend.
// Since the result is already in a register, we will do the subtract in the
@ -208,7 +209,7 @@ __alldvrm:
//
dec ebp // check result sign flag
jns short ....L9 // result is ok, set up the quotient
jns short .L9 // result is ok, set up the quotient
neg edx // otherwise, negate the result
neg eax
sbb edx,0
@ -216,7 +217,7 @@ __alldvrm:
//
// Now we need to get the quotient into edx:eax and the remainder into ebx:ecx.
//
....L9:
.L9:
mov ecx,edx
mov edx,ebx
mov ebx,ecx
@ -229,7 +230,7 @@ __alldvrm:
//
dec edi // check to see if result is negative
jnz short ....L8 // if EDI == 0, result should be negative
jnz short .L8 // if EDI == 0, result should be negative
neg edx // otherwise, negate the result
neg eax
sbb edx,0
@ -238,9 +239,11 @@ __alldvrm:
// Restore the saved registers and return.
//
....L8:
.L8:
pop ebp
pop esi
pop edi
ret 16
END