;***
;ullshr.asm - long shift right
;
;   Copyright (c) Microsoft Corporation. All rights reserved.
;
;Purpose:
;   define unsigned long shift right routine 
;       __aullshr
;
;*******************************************************************************

include hal.inc

;***
;ullshr - long shift right
;
;Purpose:
;   Does a unsigned Long Shift Right 
;   Shifts a long right any number of bits.
;
;Entry:
;   EDX:EAX - long value to be shifted
;   CL    - number of bits to shift by
;
;Exit:
;   EDX:EAX - shifted value
;
;Uses:
;   CL is destroyed.
;
;Exceptions:
;
;*******************************************************************************


__aullshr    PROC NEAR

;
; Handle shifts of 64 bits or more (if shifting 64 bits or more, the result
; depends only on the high order bit of edx).
;
    cmp cl,64
    jae short RETZERO

;
; Handle shifts of between 0 and 31 bits
;
    cmp cl, 32
    jae short MORE32
    shrd    eax,edx,cl
    shr edx,cl
    ret

;
; Handle shifts of between 32 and 63 bits
;
MORE32:
    mov eax,edx
    xor edx,edx
    and cl,31
    shr eax,cl
    ret

;
; return 0 in edx:eax
;
RETZERO:
    xor eax,eax
    xor edx,edx
    ret

__aullshr    ENDP

    end
