Check target endianness at run time, not compile time

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@8470 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 48 insertions, 31 deletions

diff --git a/gcc/final.c b/gcc/final.c
index 61a90a95eff..b046d7853d3 100644
--- a/gcc/final.c
+++ b/gcc/final.c
@@ -2077,10 +2077,9 @@ alter_subreg (x)
   else if (GET_CODE (y) == MEM)
     {
       register int offset = SUBREG_WORD (x) * UNITS_PER_WORD;
-#if BYTES_BIG_ENDIAN
-      offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))
-		 - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (y))));
-#endif
+      if (BYTES_BIG_ENDIAN)
+	offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))
+		   - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (y))));
       PUT_CODE (x, MEM);
       MEM_VOLATILE_P (x) = MEM_VOLATILE_P (y);
       XEXP (x, 0) = plus_constant (XEXP (y, 0), offset);
@@ -2839,23 +2838,29 @@ split_double (value, first, second)
 	 is that we regard the value as signed.
 	 So sign-extend it.  */
       rtx high = (INTVAL (value) < 0 ? constm1_rtx : const0_rtx);
-#if WORDS_BIG_ENDIAN
-      *first = high;
-      *second = value;
-#else
-      *first = value;
-      *second = high;
-#endif
+      if (WORDS_BIG_ENDIAN)
+	{
+	  *first = high;
+	  *second = value;
+	}
+      else
+	{
+	  *first = value;
+	  *second = high;
+	}
     }
   else if (GET_CODE (value) != CONST_DOUBLE)
     {
-#if WORDS_BIG_ENDIAN
-      *first = const0_rtx;
-      *second = value;
-#else
-      *first = value;
-      *second = const0_rtx;
-#endif
+      if (WORDS_BIG_ENDIAN)
+	{
+	  *first = const0_rtx;
+	  *second = value;
+	}
+      else
+	{
+	  *first = value;
+	  *second = const0_rtx;
+	}
     }
   else if (GET_MODE (value) == VOIDmode
 	   /* This is the old way we did CONST_DOUBLE integers.  */
@@ -2863,13 +2868,16 @@ split_double (value, first, second)
     {
       /* In an integer, the words are defined as most and least significant.
 	 So order them by the target's convention.  */
-#if WORDS_BIG_ENDIAN
-      *first = GEN_INT (CONST_DOUBLE_HIGH (value));
-      *second = GEN_INT (CONST_DOUBLE_LOW (value));
-#else
-      *first = GEN_INT (CONST_DOUBLE_LOW (value));
-      *second = GEN_INT (CONST_DOUBLE_HIGH (value));
-#endif
+      if (WORDS_BIG_ENDIAN)
+	{
+	  *first = GEN_INT (CONST_DOUBLE_HIGH (value));
+	  *second = GEN_INT (CONST_DOUBLE_LOW (value));
+	}
+      else
+	{
+	  *first = GEN_INT (CONST_DOUBLE_LOW (value));
+	  *second = GEN_INT (CONST_DOUBLE_HIGH (value));
+	}
     }
   else
     {
@@ -2891,14 +2899,23 @@ split_double (value, first, second)
 	  && ! flag_pretend_float)
       abort ();
 
-#if defined (HOST_WORDS_BIG_ENDIAN) == WORDS_BIG_ENDIAN
-      /* Host and target agree => no need to swap.  */
-      *first = GEN_INT (CONST_DOUBLE_LOW (value));
-      *second = GEN_INT (CONST_DOUBLE_HIGH (value));
+      if (
+#ifdef HOST_WORDS_BIG_ENDIAN
+	  WORDS_BIG_ENDIAN
 #else
-      *second = GEN_INT (CONST_DOUBLE_LOW (value));
-      *first = GEN_INT (CONST_DOUBLE_HIGH (value));
+	  ! WORDS_BIG_ENDIAN
 #endif
+	  )
+	{
+	  /* Host and target agree => no need to swap.  */
+	  *first = GEN_INT (CONST_DOUBLE_LOW (value));
+	  *second = GEN_INT (CONST_DOUBLE_HIGH (value));
+	}
+      else
+	{
+	  *second = GEN_INT (CONST_DOUBLE_LOW (value));
+	  *first = GEN_INT (CONST_DOUBLE_HIGH (value));
+	}
 #endif /* no REAL_ARITHMETIC */
     }
 }