Split slow unaligned load/store into smaller loads and stores.

OKed by David Edelsohn.

From-SVN: r76646

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 5b079acbf2742ccedabd378458be3033bb78400d..10a791e8dee80a8cf1bbc036b9ee0113b74a0677 100644 (file)
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -3426,6 +3426,46 @@ rs6000_emit_move (rtx dest, rtx source, enum machine_mode mode)
                      adjust_address (operands[1], SImode, 4));
       return;
     }
+    else if (mode == DImode && TARGET_POWERPC64
+               && GET_CODE (operands[0]) == REG
+               && GET_CODE (operands[1]) == MEM && optimize > 0
+               && SLOW_UNALIGNED_ACCESS (DImode,
+                                         MEM_ALIGN (operands[1]) > 32
+                                         ? 32
+                                         : MEM_ALIGN (operands[1]))
+               && !no_new_pseudos)
+      {
+        rtx mem;
+        rtx reg = gen_reg_rtx (SImode);
+        mem = adjust_address (operands[1], SImode, 0);
+        emit_insn (gen_rtx_SET (SImode, reg, mem));
+        reg  = simplify_gen_subreg (DImode, reg, SImode, 0);
+        emit_insn (gen_insvdi (operands[0], GEN_INT (32), const0_rtx, reg));
+        reg = gen_reg_rtx (SImode);
+        mem = adjust_address (operands[1], SImode, 4);
+        emit_insn (gen_rtx_SET (SImode, reg, mem));
+        reg  = simplify_gen_subreg (DImode, reg, SImode, 0);
+        emit_insn (gen_insvdi (operands[0], GEN_INT (32), GEN_INT (32), reg));
+        return;
+      }
+      else if (mode == DImode && TARGET_POWERPC64
+               && GET_CODE (operands[1]) == REG
+               && GET_CODE (operands[0]) == MEM && optimize > 0
+               && SLOW_UNALIGNED_ACCESS (DImode,
+                                         MEM_ALIGN (operands[0]) > 32
+                                         ? 32
+                                         : MEM_ALIGN (operands[0]))
+               && !no_new_pseudos)
+      {
+        rtx mem;
+        rtx reg = gen_reg_rtx (DImode);
+        emit_move_insn (reg, gen_rtx_LSHIFTRT (DImode, operands[1], GEN_INT (32)));
+        mem = adjust_address (operands[0], SImode, 0);
+        emit_move_insn (mem, simplify_gen_subreg (SImode, reg, DImode, 0));
+        mem = adjust_address (operands[0], SImode, 4);
+        emit_move_insn (mem, simplify_gen_subreg (SImode, operands[1], DImode, 0));
+        return;
+      }
   
   if (!no_new_pseudos)
     {