win64: add a XMM clobber test configure option.

This will be useful to test more aggressively for failures to mark XMM
registers as clobbered in Win64 builds, and prevent regressions thereof.

Based on a patch by Ramiro Polla <ramiro.polla@gmail.com>

2 files changed, 33 insertions, 0 deletions

diff --git a/libswscale/Makefile b/libswscale/Makefile
index bef4200c59..0aee7e497b 100644
--- a/libswscale/Makefile
+++ b/libswscale/Makefile
@@ -21,6 +21,8 @@ MMX-OBJS-$(HAVE_YASM)      +=  x86/input.o              \
                                x86/output.o             \
                                x86/scale.o
 
+OBJS-$(CONFIG_XMM_CLOBBER_TEST) += x86/w64xmmtest.o
+
 TESTPROGS = colorspace swscale
 
 DIRS = bfin mlib ppc sparc x86
diff --git a/libswscale/x86/w64xmmtest.c b/libswscale/x86/w64xmmtest.c
new file mode 100644
index 0000000000..dd9a2a4378
--- /dev/null
+++ b/libswscale/x86/w64xmmtest.c
@@ -0,0 +1,31 @@
+/*
+ * check XMM registers for clobbers on Win64
+ * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/x86/w64xmmtest.h"
+#include "libswscale/swscale.h"
+
+wrap(sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
+               const int srcStride[], int srcSliceY, int srcSliceH,
+               uint8_t *const dst[], const int dstStride[]))
+{
+    testxmmclobbers(sws_scale, c, srcSlice, srcStride, srcSliceY,
+                    srcSliceH, dst, dstStride);
+}