rs6000.c (rs6000_emit_move): Make sure that using FP registers for DImode mem-mem...

* config/rs6000/rs6000.c (rs6000_emit_move): Make sure that
using FP registers for DImode mem-mem moves is acceptable.

From-SVN: r46720

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 95ea42222d1754126dab869c6abd7421845e4a43..c2c619f3d3c9a9003113da94569868e15209b7fc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-11-02  DJ Delorie  <dj@redhat.com>
+
+       * config/rs6000/rs6000.c (rs6000_emit_move): Make sure that
+       using FP registers for DImode mem-mem moves is acceptable.
+
 2001-11-02  Aldy Hernandez  <aldyh@redhat.com>
 
        * builtins.c (apply_args_size): Handle vector arguments.

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index a87e4ef2c0fee0f50d9e133fc6d7d657f24d8777..f10cef5aee846bea7e9fbd4671cc2c29e14fbfcb 100644 (file)
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1805,6 +1805,25 @@ rs6000_emit_move (dest, source, mode)
          || (CONST_DOUBLE_HIGH (operands[1]) == -1
              && CONST_DOUBLE_LOW (operands[1]) < 0)))
     abort ();
+
+  /* Check if GCC is setting up a block move that will end up using FP
+     registers as temporaries.  We must make sure this is acceptable.  */
+  if (GET_CODE (operands[0]) == MEM
+      && GET_CODE (operands[1]) == MEM
+      && mode == DImode
+      && ! TARGET_POWERPC64
+      && (SLOW_UNALIGNED_ACCESS(DImode, MEM_ALIGN(operands[0]))
+         || SLOW_UNALIGNED_ACCESS(DImode, MEM_ALIGN(operands[1]))))
+    {
+      rtx reg1, reg2;
+      reg1 = gen_reg_rtx(SImode);
+      reg2 = gen_reg_rtx(SImode);
+      rs6000_emit_move (reg1, simplify_subreg (SImode, operands[1], DImode, 0), SImode);
+      rs6000_emit_move (reg2, simplify_subreg (SImode, operands[1], DImode, 4), SImode);
+      rs6000_emit_move (simplify_subreg (SImode, operands[0], DImode, 0), reg1, SImode);
+      rs6000_emit_move (simplify_subreg (SImode, operands[0], DImode, 4), reg2, SImode);
+      return;
+    }
   
   if (! no_new_pseudos && GET_CODE (operands[0]) != REG)
     operands[1] = force_reg (mode, operands[1]);