(output_move_double): Fix up the test for overlap

of source address with operands[0].

From-SVN: r5987

diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
index 4f71e0591bf85d46b1393185b0e4d2b71cebabda..1e29a6db6a7ef175c0b418ae9701306a5d990a04 100644 (file)
--- a/gcc/config/m68k/m68k.c
+++ b/gcc/config/m68k/m68k.c
@@ -1077,11 +1077,14 @@ output_move_double (operands)
   if (optype0 == REGOP
       && (optype1 == OFFSOP || optype1 == MEMOP))
     {
-      if (reg_overlap_mentioned_p (operands[0], XEXP (operands[1], 0))
+      rtx testlow = gen_rtx (REG, SImode, REGNO (operands[0]));
+
+      if (reg_overlap_mentioned_p (testlow, XEXP (operands[1], 0))
          && reg_overlap_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
        {
          /* If both halves of dest are used in the src memory address,
-            compute the address into latehalf of dest.  */
+            compute the address into latehalf of dest.
+            Note that this can't happen if the dest is two data regs.  */
 compadr:
          xops[0] = latehalf[0];
          xops[1] = XEXP (operands[1], 0);
@@ -1102,8 +1105,13 @@ compadr:
               && reg_overlap_mentioned_p (middlehalf[0],
                                           XEXP (operands[1], 0)))
        {
-         /* Check for two regs used by both source and dest. */
-         if (reg_overlap_mentioned_p (operands[0], XEXP (operands[1], 0))
+         /* Check for two regs used by both source and dest.
+            Note that this can't happen if the dest is all data regs.
+            It can happen if the dest is d6, d7, a0.
+            But in that case, latehalf is an addr reg, so
+            the code at compadr does ok.  */
+
+         if (reg_overlap_mentioned_p (testlow, XEXP (operands[1], 0))
              || reg_overlap_mentioned_p (latehalf[0], XEXP (operands[1], 0)))
            goto compadr;