Gcc 3.4.6 as of 2006/08/25 #116475.

1 files changed, 16 insertions, 19 deletions

diff --git a/contrib/gcc/expmed.c b/contrib/gcc/expmed.c
index a803934..864f78a 100644
--- a/contrib/gcc/expmed.c
+++ b/contrib/gcc/expmed.c
@@ -389,25 +389,11 @@ store_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
 	     || (offset * BITS_PER_UNIT % bitsize == 0
 		 && MEM_ALIGN (op0) % GET_MODE_BITSIZE (fieldmode) == 0))))
     {
-      if (GET_MODE (op0) != fieldmode)
-	{
-	  if (GET_CODE (op0) == SUBREG)
-	    {
-	      if (GET_MODE (SUBREG_REG (op0)) == fieldmode
-		  || GET_MODE_CLASS (fieldmode) == MODE_INT
-		  || GET_MODE_CLASS (fieldmode) == MODE_PARTIAL_INT)
-		op0 = SUBREG_REG (op0);
-	      else
-		/* Else we've got some float mode source being extracted into
-		   a different float mode destination -- this combination of
-		   subregs results in Severe Tire Damage.  */
-		abort ();
-	    }
-	  if (GET_CODE (op0) == REG)
-	    op0 = gen_rtx_SUBREG (fieldmode, op0, byte_offset);
-	  else
-	    op0 = adjust_address (op0, fieldmode, offset);
-	}
+      if (GET_CODE (op0) == MEM)
+	op0 = adjust_address (op0, fieldmode, offset);
+      else if (GET_MODE (op0) != fieldmode)
+	op0 = simplify_gen_subreg (fieldmode, op0, GET_MODE (op0),
+				   byte_offset);
       emit_move_insn (op0, value);
       return value;
     }
@@ -622,6 +608,7 @@ store_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
 	    bestmode = GET_MODE (op0);
 
 	  if (bestmode == VOIDmode
+	      || GET_MODE_SIZE (bestmode) < GET_MODE_SIZE (fieldmode)
 	      || (SLOW_UNALIGNED_ACCESS (bestmode, MEM_ALIGN (op0))
 		  && GET_MODE_BITSIZE (bestmode) > MEM_ALIGN (op0)))
 	    goto insv_loses;
@@ -1401,6 +1388,11 @@ extract_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
 		  xbitpos = bitnum % unit;
 		  xop0 = adjust_address (xop0, bestmode, xoffset);
 
+		  /* Make sure register is big enough for the whole field. */
+		  if (xoffset * BITS_PER_UNIT + unit 
+		      < offset * BITS_PER_UNIT + bitsize)
+		    goto extzv_loses;
+
 		  /* Fetch it to a register in that size.  */
 		  xop0 = force_reg (bestmode, xop0);
 
@@ -1531,6 +1523,11 @@ extract_bit_field (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
 		  xbitpos = bitnum % unit;
 		  xop0 = adjust_address (xop0, bestmode, xoffset);
 
+		  /* Make sure register is big enough for the whole field. */
+		  if (xoffset * BITS_PER_UNIT + unit 
+		      < offset * BITS_PER_UNIT + bitsize)
+		    goto extv_loses;
+
 		  /* Fetch it to a register in that size.  */
 		  xop0 = force_reg (bestmode, xop0);