X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fcommon%2Fcrc32c_intel_fast.c;fp=src%2Fceph%2Fsrc%2Fcommon%2Fcrc32c_intel_fast.c;h=adaf3d7779e2baf47c1015abb2961c2e41084d4c;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/common/crc32c_intel_fast.c b/src/ceph/src/common/crc32c_intel_fast.c
new file mode 100644
index 0000000..adaf3d7
--- /dev/null
+++ b/src/ceph/src/common/crc32c_intel_fast.c
@@ -0,0 +1,51 @@
+#include "acconfig.h"
+#include "common/crc32c_intel_baseline.h"
+
+extern unsigned int crc32_iscsi_00(unsigned char const *buffer, int len, unsigned int crc);
+extern unsigned int crc32_iscsi_zero_00(unsigned char const *buffer, int len, unsigned int crc);
+
+#ifdef HAVE_GOOD_YASM_ELF64
+
+uint32_t ceph_crc32c_intel_fast(uint32_t crc, unsigned char const *buffer, unsigned len)
+{
+	uint32_t v;
+	unsigned left;
+
+	if (!buffer)
+	{
+	  return crc32_iscsi_zero_00(buffer, len, crc);
+	}
+
+	/*
+	 * the crc32_iscsi_00 method reads past buffer+len (because it
+	 * reads full words) which makes valgrind unhappy.  don't do
+	 * that.
+	 */
+	if (len < 16)
+		return ceph_crc32c_intel_baseline(crc, buffer, len);
+	left = ((unsigned long)buffer + len) & 7;
+	len -= left;
+	v = crc32_iscsi_00(buffer, len, crc);
+	if (left)
+		v = ceph_crc32c_intel_baseline(v, buffer + len, left);
+	return v;
+}
+
+int ceph_crc32c_intel_fast_exists(void)
+{
+	return 1;
+}
+
+#else
+
+int ceph_crc32c_intel_fast_exists(void)
+{
+	return 0;
+}
+
+uint32_t ceph_crc32c_intel_fast(uint32_t crc, unsigned char const *buffer, unsigned len)
+{
+	return 0;
+}
+
+#endif