Fixed bug #1111

kwm@rainbow-runner.nl 2011-01-30 06:28:27 PST

When building sdl 1.2.14 with the Clang compiler http://clang.llvm.org .
The build fails in src/video/mmx.h with the following error:

--------------------------------------------------
./src/video/SDL_RLEaccel.c:831:5: error: invalid operand for instruction
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
^
./src/video/SDL_RLEaccel.c:831:17: note: instantiated from:
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
^
./src/video/SDL_RLEaccel.c:831:5: note: instantiated from:
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
^
./src/video/SDL_RLEaccel.c:647:23: note: instantiated from:
blitter(2, Uint8, ALPHA_BLIT16_565MMX); \
^
./src/video/SDL_RLEaccel.c:282:4: note: instantiated from:
movq_r2m(mm3, *dstp); \
^
In file included from ./src/video/SDL_RLEaccel.c:99:
./src/video/mmx.h:379:28: note: instantiated from:
#define movq_r2m(reg, var) mmx_r2m(movq, reg, var)
^
<scratch space>:192:1: note: instantiated from:
"movq"
^
<inline asm>:1:2: note: instantiated into assembly here
movq %mm3, %dx
^
--------------------------------------------------

According to the clang developers this is a invalid inline assembly.
Using the attached patch from the last commit in the below bug report fixes the
compile.
More details from: http://llvm.org/bugs/show_bug.cgi?id=6730

     1.1 --- a/src/video/mmx.h	Thu Jan 27 00:33:26 2011 -0800
     1.2 +++ b/src/video/mmx.h	Sun Jan 30 13:38:57 2011 -0800
     1.3 @@ -355,7 +355,7 @@
     1.4  
     1.5  #define	mmx_r2m(op, reg, mem) \
     1.6  	__asm__ __volatile__ (#op " %%" #reg ", %0" \
     1.7 -			      : "=X" (mem) \
     1.8 +			      : "=m" (mem) \
     1.9  			      : /* nothing */ )
    1.10  
    1.11  #define	mmx_r2r(op, regs, regd) \