altivec gcc-3 fixes by (Magnus Damm <damm at opensource dot se>)

Originally committed as revision 1896 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 85 insertions, 0 deletions

diff --git a/libavcodec/ppc/gcc_fixes.h b/libavcodec/ppc/gcc_fixes.h
new file mode 100644
index 0000000000..855a5b4f7b
--- /dev/null
+++ b/libavcodec/ppc/gcc_fixes.h
@@ -0,0 +1,85 @@
+/*
+ * gcc fixes for altivec.
+ * Used to workaround broken gcc (FSF gcc-3 pre gcc-3.3) 
+ * and to stay somewhat compatible with Darwin.
+ */
+
+#ifndef _GCC_FIXES_
+#define _GCC_FIXES_
+
+#ifdef HAVE_ALTIVEC_H
+#include <altivec.h>
+#endif
+
+#ifdef CONFIG_DARWIN
+#define AVV(x...) (x)
+#else
+#define AVV(x...) {x}
+
+#if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)  
+
+/* This code was provided to me by Bartosch Pixa
+ * as a separate header file (broken_mergel.h).
+ * thanks to lu_zero for the workaround.
+ *
+ * See this mail for more information:
+ * http://gcc.gnu.org/ml/gcc/2003-04/msg00967.html
+ */
+
+static inline vector signed char my_vmrglb (vector signed char const A,
+					  vector signed char const B)
+{
+    static const vector unsigned char lowbyte = {
+	0x08, 0x18, 0x09, 0x19, 0x0a, 0x1a, 0x0b,  0x1b,
+	0x0c, 0x1c, 0x0d, 0x1d, 0x0e, 0x1e, 0x0f, 0x1f
+    };
+    return vec_perm (A, B, lowbyte);
+}
+
+static inline vector signed short my_vmrglh (vector signed short const A,
+					  vector signed short const B)
+{
+    static const vector unsigned char lowhalf = {
+    	0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
+	0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
+    };
+    return vec_perm (A, B, lowhalf);
+}
+
+static inline vector signed int my_vmrglw (vector signed int const A,
+					  vector signed int const B)
+{
+    static const vector unsigned char lowword = {
+    	0x08, 0x09, 0x0a, 0x0b, 0x18, 0x19, 0x1a, 0x1b,
+	0x0c, 0x0d, 0x0e, 0x0f, 0x1c, 0x1d, 0x1e, 0x1f
+    };
+    return vec_perm (A, B, lowword);
+}
+/*#define my_vmrglb my_vmrglb 
+#define my_vmrglh my_vmrglh 
+#define my_vmrglw my_vmrglw 
+*/
+#undef vec_mergel
+
+#define vec_mergel(a1, a2) \
+__ch (__bin_args_eq (vector signed char, (a1), vector signed char, (a2)), \
+      ((vector signed char) my_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
+__ch (__bin_args_eq (vector unsigned char, (a1), vector unsigned char, (a2)), \
+      ((vector unsigned char) my_vmrglb ((vector signed char) (a1), (vector signed char) (a2))), \
+__ch (__bin_args_eq (vector signed short, (a1), vector signed short, (a2)), \
+      ((vector signed short) my_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
+__ch (__bin_args_eq (vector unsigned short, (a1), vector unsigned short, (a2)), \
+      ((vector unsigned short) my_vmrglh ((vector signed short) (a1), (vector signed short) (a2))), \
+__ch (__bin_args_eq (vector float, (a1), vector float, (a2)), \
+      ((vector float) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
+__ch (__bin_args_eq (vector signed int, (a1), vector signed int, (a2)), \
+      ((vector signed int) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
+__ch (__bin_args_eq (vector unsigned int, (a1), vector unsigned int, (a2)), \
+      ((vector unsigned int) my_vmrglw ((vector signed int) (a1), (vector signed int) (a2))), \
+    __altivec_link_error_invalid_argument ())))))))
+
+#endif
+
+#endif /* CONFIG_DARWIN */
+
+#endif /* _GCC_FIXES_ */