Rewrite the JDIMENSION argument management for x86 64-bit assembly to

simd/jiss2int-64.asm

 ;
 ; jiss2int-64.asm - accurate integer IDCT (64-bit SSE2)
 ;
 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
 ; Copyright 2009 D. R. Commander
 ;
 ; Based on
 ; x86 SIMD extension for IJG JPEG library
 ; Copyright (C) 1999-2006, MIYASAKA Masaru.
 ; For conditions of distribution and use, see copyright notice in jsimdext.inc
@@ skipping 497 matching lines @@
 
         prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
         prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
         prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
         prefetchnta [rsi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
 
         ; ---- Pass 2: process rows from work array, store into output array.
 
         mov     rax, [original_rbp]
         mov     rdi, r12        ; (JSAMPROW *)
-        mov     rax, r13
+        mov     eax, r13d
 
         ; -- Even part
 
         ; xmm7=col0, xmm1=col2, xmm0=col4, xmm2=col6
 
         ; (Original)
         ; z1 = (z2 + z3) * 0.541196100;
         ; tmp2 = z1 + z3 * -1.847759065;
         ; tmp3 = z1 + z2 * 0.765366865;
         ;
@@ skipping 310 matching lines @@
 
         uncollect_args
         mov     rsp,rbp         ; rsp <- aligned rbp
         pop     rsp             ; rsp <- original rbp
         pop     rbp
         ret
 
 ; For some reason, the OS X linker does not honor the request to align the
 ; segment unless we do this.
         align   16