PR c/38957

[pf3gnuchains/gcc-fork.git] / libdecnumber / bid / host-ieee128.c

diff --git a/libdecnumber/bid/host-ieee128.c b/libdecnumber/bid/host-ieee128.c
index 2c8ea32..12632c8 100644 (file)
--- a/libdecnumber/bid/host-ieee128.c
+++ b/libdecnumber/bid/host-ieee128.c
@@ -27,56 +27,37 @@ along with GCC; see the file COPYING.  If not, write to the Free
 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
 02110-1301, USA.  */
 
-#include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
-#include <limits.h>
 
-#include "config.h"
-#include "gstdint.h"
+#include "dconfig.h"
 #include "bid-dpd.h"
 #include "decimal128.h"
 
-extern uint32_t __dec_byte_swap (uint32_t);
 void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
 void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
 
-#ifndef WORDS_BIGENDIAN
-#define WORDS_BIGENDIAN 0
-#endif
-
-static void
-__swap128 (char *src, char *dst)
-{
-  uint32_t t1, t2, t3, t4;
-
-  if (!WORDS_BIGENDIAN)
-    {
-      memcpy (&t1, src, 4);
-      memcpy (&t2, src + 4, 4);
-      memcpy (&t3, src + 8, 4);
-      memcpy (&t4, src + 12, 4);
-      t1 = __dec_byte_swap (t1);
-      t2 = __dec_byte_swap (t2);
-      t3 = __dec_byte_swap (t3);
-      t4 = __dec_byte_swap (t4);
-      memcpy (dst, &t4, 4);
-      memcpy (dst + 4, &t3, 4);
-      memcpy (dst + 8, &t2, 4);
-      memcpy (dst + 12, &t1, 4);
-    }
-  else
-    memcpy (dst, src, 16);
-}
+/* The code for converting 128-bit values between DPD and BID presumes
+   that the 64-bit halves of the 128-bit value are in little-endian
+   order, so they need swapping on big-endian hosts.  */
 
 void
 __host_to_ieee_128 (_Decimal128 in, decimal128 *out)
 {
-  __swap128 ((char *) &in, (char *) out);
+#if WORDS_BIGENDIAN
+  memcpy ((char *) out, (char *) &in + 8, 8);
+  memcpy ((char *) out + 8, (char *) &in, 8);
+#else
+  memcpy ((char *) out, (char *) &in, 16);
+#endif
 }
 
 void
 __ieee_to_host_128 (decimal128 in, _Decimal128 *out)
 {
-  __swap128 ((char *) &in, (char *) out);
+#if WORDS_BIGENDIAN
+  memcpy ((char *) out, (char *) &in + 8, 8);
+  memcpy ((char *) out + 8, (char *) &in, 8);
+#else
+  memcpy ((char *) out, (char *) &in, 16);
+#endif
 }