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

simd/jdsamss2-64.asm

 ;
 ; jdsamss2-64.asm - upsampling (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 49 matching lines @@
 
         align   16
         global  EXTN(jsimd_h2v1_fancy_upsample_sse2) PRIVATE
 
 EXTN(jsimd_h2v1_fancy_upsample_sse2):
         push    rbp
         mov     rax,rsp
         mov     rbp,rsp
         collect_args
 
-        mov     rax, r11  ; colctr
+        mov     eax, r11d  ; colctr
         test    rax,rax
         jz      near .return
 
-        mov     rcx, r10        ; rowctr
+        mov     ecx, r10d       ; rowctr
         test    rcx,rcx
         jz      near .return
 
         mov     rsi, r12        ; input_data
         mov     rdi, r13
         mov     rdi, JSAMPARRAY [rdi]                   ; output_data
 .rowloop:
         push    rax                     ; colctr
         push    rdi
         push    rsi
@@ skipping 414 matching lines @@
 
         align   16
         global  EXTN(jsimd_h2v1_upsample_sse2) PRIVATE
 
 EXTN(jsimd_h2v1_upsample_sse2):
         push    rbp
         mov     rax,rsp
         mov     rbp,rsp
         collect_args
 
-        mov     rdx, r11
+        mov     edx, r11d
         add     rdx, byte (2*SIZEOF_XMMWORD)-1
         and     rdx, byte -(2*SIZEOF_XMMWORD)
         jz      near .return
 
         mov     rcx, r10        ; rowctr
         test    rcx,rcx
         jz      short .return
 
         mov     rsi, r12 ; input_data
         mov     rdi, r13
@@ skipping 69 matching lines @@
         align   16
         global  EXTN(jsimd_h2v2_upsample_sse2) PRIVATE
 
 EXTN(jsimd_h2v2_upsample_sse2):
         push    rbp
         mov     rax,rsp
         mov     rbp,rsp
         collect_args
         push    rbx
 
-        mov     rdx, r11
+        mov     edx, r11d
         add     rdx, byte (2*SIZEOF_XMMWORD)-1
         and     rdx, byte -(2*SIZEOF_XMMWORD)
         jz      near .return
 
         mov     rcx, r10        ; rowctr
         test    rcx,rcx
         jz      near .return
 
         mov     rsi, r12        ; input_data
         mov     rdi, r13
@@ skipping 52 matching lines @@
 
 .return:
         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