1 files changed, 74 insertions, 0 deletions
diff --git a/include/asm-alpha/compiler.h b/include/asm-alpha/compiler.h
new file mode 100644
index 000000000..5656ce953
--- /dev/null
+++ b/include/asm-alpha/compiler.h
@@ -0,0 +1,74 @@
+#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.
+ */
+
+/*
+ * EGCS (of varying versions) does a good job of using insxl and extxl.
+ */
+
+#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91
+#define __kernel_insbl(val, shift) \
+  (((unsigned long)(val) & 0xfful) << ((shift) * 8))
+#define __kernel_inswl(val, shift) \
+  (((unsigned long)(val) & 0xfffful) << ((shift) * 8))
+#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; })
+#endif
+
+#if __GNUC__ > 2 || __GNUC_MINOR__ >= 92
+#define __kernel_extbl(val, shift)  (((val) >> (((shift) & 7) * 8)) & 0xfful)
+#define __kernel_extwl(val, shift)  (((val) >> (((shift) & 7) * 8)) & 0xfffful)
+#else
+#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; })
+#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, so allow users to tell us when
+ * the compiler will DTRT.
+ */
+
+#if defined(HAVE_BWX) || 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__("ldbu %0,%1" : "=r"(__kir) : "m"(mem));	\
+     __kir; })
+#define __kernel_ldwu(mem)				\
+  ({ unsigned short __kir;				\
+     __asm__("ldwu %0,%1" : "=r"(__kir) : "m"(mem));	\
+     __kir; })
+#define __kernel_stb(val,mem) \
+  __asm__("stb %1,%0" : "=m"(mem) : "r"(val))
+#define __kernel_stw(val,mem) \
+  __asm__("stw %1,%0" : "=m"(mem) : "r"(val))
+#endif
+
+#endif /* __ALPHA_COMPILER_H */