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

simd/jiss2red-64.asm

 ;
 ; jiss2red-64.asm - reduced-size 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 294 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, store into output array.
 
         mov     rax, [original_rbp]
         mov     rdi, r12        ; (JSAMPROW *)
-        mov     rax, r13
+        mov     eax, r13d
 
         ; -- Even part
 
         pxor      xmm4,xmm4
         punpcklwd xmm4,xmm1             ; xmm4=tmp0
         psrad     xmm4,(16-CONST_BITS-1) ; psrad xmm4,16 & pslld xmm4,CONST_BITS+1
 
         ; -- Odd part
 
         punpckhwd xmm1,xmm0
@@ skipping 188 matching lines @@
         ; -- Prefetch the next coefficient block
 
         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, store into output array.
 
         mov     rdi, r12        ; (JSAMPROW *)
-        mov     rax, r13
+        mov     eax, r13d
 
         ; | input:| result:|
         ; | A0 B0 |        |
         ; | A1 B1 | C0 C1  |
         ; | A3 B3 | D0 D1  |
         ; | A5 B5 |        |
         ; | A7 B7 |        |
 
         ; -- Odd part
 
@@ skipping 32 matching lines @@
         mov     WORD [rsi+rax*SIZEOF_JSAMPLE], cx
 
         pop     rbx
         uncollect_args
         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