Abs implementations for 16-, 32-, and 64-bit floats and integers

win32_abs.asm

;; win32_abs.asm
;;
;; These are intended as minimal implementations of ABS functions
;;

.const 
align 16
    abs_mask_ps dd 07FFFFFFFh, 07FFFFFFFh, 07FFFFFFFh, 07FFFFFFFh
    abs_mask_pd dq 07FFFFFFFFFFFFFFFh, 07FFFFFFFFFFFFFFFh

text segment 'CODE'
Abs16 proc
    mov     ax, cx
    cwd
    xor     ax, dx
    sub     ax, dx
    ret
Abs16 endp

Abs32 proc
    mov     eax, ecx
    cdq
    xor     eax, edx
    sub     eax, edx
    ret
Abs32 endp

Abs64 proc
    mov     rax, rcx
    cqo
    xor     rax, rdx
    sub     rax, rdx
    ret
Abs64 endp

AbsF32 proc
    andps   xmm0, xmmword ptr [abs_mask_ps]
    ret
AbsF32 endp

AbsF64 proc
    andpd   xmm0, xmmword ptr [abs_mask_pd]
    ret
AbsF64 endp

text ends

end