Check whether IBM or Apple PPC assembler syntax is used

This checks which assembler syntax is supported and defines macros
for register names accordingly.

Originally committed as revision 23952 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -989,6 +989,7 @@ HAVE_LIST="
     GetProcessTimes
     getrusage
     struct_rusage_ru_maxrss
+    ibm_asm
     inet_aton
     inline_asm
     isatty
@@ -2340,6 +2341,7 @@ elif enabled ppc; then
     enable local_aligned_8 local_aligned_16
 
     check_asm dcbzl     '"dcbzl 0, 1"'
+    check_asm ibm_asm   '"add 0, 0, 0"'
     check_asm ppc4xx    '"maclhw r10, r11, r12"'
     check_asm xform_asm '"lwzx %1, %y0" :: "Z"(*(int*)0), "r"(0)'
 

libavcodec/ppc/asm.S

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2009 Loren Merritt
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#if HAVE_IBM_ASM
+
+.macro DEFINE_REG n
+    .equiv r\n, \n
+    .equiv f\n, \n
+    .equiv v\n, \n
+.endm
+
+DEFINE_REG 0
+DEFINE_REG 1
+DEFINE_REG 2
+DEFINE_REG 3
+DEFINE_REG 4
+DEFINE_REG 5
+DEFINE_REG 6
+DEFINE_REG 7
+DEFINE_REG 8
+DEFINE_REG 9
+DEFINE_REG 10
+DEFINE_REG 11
+DEFINE_REG 12
+DEFINE_REG 13
+DEFINE_REG 14
+DEFINE_REG 15
+DEFINE_REG 16
+DEFINE_REG 17
+DEFINE_REG 18
+DEFINE_REG 19
+DEFINE_REG 20
+DEFINE_REG 21
+DEFINE_REG 22
+DEFINE_REG 23
+DEFINE_REG 24
+DEFINE_REG 25
+DEFINE_REG 26
+DEFINE_REG 27
+DEFINE_REG 28
+DEFINE_REG 29
+DEFINE_REG 30
+DEFINE_REG 31
+
+#endif /* HAVE_IBM_ASM */

libavcodec/ppc/regs.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2010 Mans Rullgard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_PPC_REGS_H
+#define AVCODEC_PPC_REGS_H
+
+#include "libavutil/avutil.h"
+#include "config.h"
+
+#if HAVE_IBM_ASM
+#   define r(n) AV_TOSTRING(n)
+#   define f(n) AV_TOSTRING(n)
+#   define v(n) AV_TOSTRING(n)
+#else
+#   define r(n) AV_TOSTRING(r ## n)
+#   define f(n) AV_TOSTRING(f ## n)
+#   define v(n) AV_TOSTRING(v ## n)
+#endif
+
+#endif /* AVCODEC_PPC_REGS_H */