compiler.h

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#ifndef __ALPHA_COMPILER_H
#define __ALPHA_COMPILER_H

/* 
 * Herein are macros we use when describing various patterns we want to GCC.
 * In all cases we can get better schedules out of the compiler if we hide
 * as little as possible inside inline assembly.  However, we want to be
 * able to know what we'll get out before giving up inline assembly.  Thus
 * these tests and macros.
 */

#if __GNUC__ == 3 && __GNUC_MINOR__ >= 4 || __GNUC__ > 3
# define __kernel_insbl(val, shift) __builtin_alpha_insbl(val, shift)
# define __kernel_inswl(val, shift) __builtin_alpha_inswl(val, shift)
# define __kernel_insql(val, shift) __builtin_alpha_insql(val, shift)
# define __kernel_inslh(val, shift) __builtin_alpha_inslh(val, shift)
# define __kernel_extbl(val, shift) __builtin_alpha_extbl(val, shift)
# define __kernel_extwl(val, shift) __builtin_alpha_extwl(val, shift)
# define __kernel_cmpbge(a, b)      __builtin_alpha_cmpbge(a, b)
#else
# define __kernel_insbl(val, shift)                 \
  ({ unsigned long __kir;                       \
     __asm__("insbl %2,%1,%0" : "=r"(__kir) : "rI"(shift), "r"(val));   \
     __kir; })
# define __kernel_inswl(val, shift)                 \
  ({ unsigned long __kir;                       \
     __asm__("inswl %2,%1,%0" : "=r"(__kir) : "rI"(shift), "r"(val));   \
     __kir; })
# define __kernel_insql(val, shift)                 \
  ({ unsigned long __kir;                       \
     __asm__("insql %2,%1,%0" : "=r"(__kir) : "rI"(shift), "r"(val));   \
     __kir; })
# define __kernel_inslh(val, shift)                 \
  ({ unsigned long __kir;                       \
     __asm__("inslh %2,%1,%0" : "=r"(__kir) : "rI"(shift), "r"(val));   \
     __kir; })
# define __kernel_extbl(val, shift)                 \
  ({ unsigned long __kir;                       \
     __asm__("extbl %2,%1,%0" : "=r"(__kir) : "rI"(shift), "r"(val));   \
     __kir; })
# define __kernel_extwl(val, shift)                 \
  ({ unsigned long __kir;                       \
     __asm__("extwl %2,%1,%0" : "=r"(__kir) : "rI"(shift), "r"(val));   \
     __kir; })
# define __kernel_cmpbge(a, b)                      \
  ({ unsigned long __kir;                       \
     __asm__("cmpbge %r2,%1,%0" : "=r"(__kir) : "rI"(b), "rJ"(a));  \
     __kir; })
#endif

#ifdef __alpha_cix__
# if __GNUC__ == 3 && __GNUC_MINOR__ >= 4 || __GNUC__ > 3
#  define __kernel_cttz(x)      __builtin_ctzl(x)
#  define __kernel_ctlz(x)      __builtin_clzl(x)
#  define __kernel_ctpop(x)     __builtin_popcountl(x)
# else
#  define __kernel_cttz(x)                      \
   ({ unsigned long __kir;                      \
      __asm__("cttz %1,%0" : "=r"(__kir) : "r"(x));         \
      __kir; })
#  define __kernel_ctlz(x)                      \
   ({ unsigned long __kir;                      \
      __asm__("ctlz %1,%0" : "=r"(__kir) : "r"(x));         \
      __kir; })
#  define __kernel_ctpop(x)                     \
   ({ unsigned long __kir;                      \
      __asm__("ctpop %1,%0" : "=r"(__kir) : "r"(x));            \
      __kir; })
# endif
#else
# define __kernel_cttz(x)                       \
  ({ unsigned long __kir;                       \
     __asm__(".arch ev67; cttz %1,%0" : "=r"(__kir) : "r"(x));      \
     __kir; })
# define __kernel_ctlz(x)                       \
  ({ unsigned long __kir;                       \
     __asm__(".arch ev67; ctlz %1,%0" : "=r"(__kir) : "r"(x));      \
     __kir; })
# define __kernel_ctpop(x)                      \
  ({ unsigned long __kir;                       \
     __asm__(".arch ev67; ctpop %1,%0" : "=r"(__kir) : "r"(x));     \
     __kir; })
#endif


/* 
 * Beginning with EGCS 1.1, GCC defines __alpha_bwx__ when the BWX 
 * extension is enabled.  Previous versions did not define anything
 * we could test during compilation -- too bad, so sad.
 */

#if defined(__alpha_bwx__)
#define __kernel_ldbu(mem)  (mem)
#define __kernel_ldwu(mem)  (mem)
#define __kernel_stb(val,mem)   ((mem) = (val))
#define __kernel_stw(val,mem)   ((mem) = (val))
#else
#define __kernel_ldbu(mem)              \
  ({ unsigned char __kir;               \
     __asm__(".arch ev56;               \
          ldbu %0,%1" : "=r"(__kir) : "m"(mem));    \
     __kir; })
#define __kernel_ldwu(mem)              \
  ({ unsigned short __kir;              \
     __asm__(".arch ev56;               \
          ldwu %0,%1" : "=r"(__kir) : "m"(mem));    \
     __kir; })
#define __kernel_stb(val,mem)               \
  __asm__(".arch ev56;                  \
       stb %1,%0" : "=m"(mem) : "r"(val))
#define __kernel_stw(val,mem)               \
  __asm__(".arch ev56;                  \
       stw %1,%0" : "=m"(mem) : "r"(val))
#endif

#ifdef __KERNEL__
/* Some idiots over in <linux/compiler.h> thought inline should imply
   always_inline.  This breaks stuff.  We'll include this file whenever
   we run into such problems.  */

#include <linux/compiler.h>
#undef inline
#undef __inline__
#undef __inline
#undef __always_inline
#define __always_inline     inline __attribute__((always_inline))

#endif /* __KERNEL__ */

#endif /* __ALPHA_COMPILER_H */