ARM: check for VFP register arguments

Originally committed as revision 19474 to svn://svn.ffmpeg.org/ffmpeg/trunk

2 files changed, 15 insertions, 0 deletions

diff --git a/configure b/configure
index ec0eab8d36..f08c1de8cb 100755
--- a/configure
+++ b/configure
@@ -958,6 +958,7 @@ HAVE_LIST="
     termios_h
     threads
     truncf
+    vfp_args
     VirtualAlloc
     winsock2_h
     xform_asm
@@ -2042,6 +2043,11 @@ fi
 
 # check for assembler specific support
 
+enabled arm && check_ld <<EOF && enable vfp_args
+__asm__ (".eabi_attribute 28, 1");
+int main(void) { return 0; }
+EOF
+
 enabled mips && check_asm loongson '"dmult.g $1, $2, $3"'
 
 enabled ppc && check_asm dcbzl '"dcbzl 0, 1"'
diff --git a/libavcodec/arm/asm.S b/libavcodec/arm/asm.S
index 69d83488ad..087b279651 100644
--- a/libavcodec/arm/asm.S
+++ b/libavcodec/arm/asm.S
@@ -45,3 +45,12 @@
         ldr             \rd, =\val
 #endif
         .endm
+
+#if HAVE_VFP_ARGS
+        .eabi_attribute 28, 1
+#   define VFP
+#   define NOVFP @
+#else
+#   define VFP   @
+#   define NOVFP
+#endif