Re: [PATCH 2/4] The main m68k cc0 conversion

[Bernd Schmidt]

On 11/23/19 9:53 PM, Bernd Schmidt wrote:
> I'll spend a few more days trying to see if I can do something about the
> bootstrap failure Mikael saw (currently trying to do a two-stage cross
> build rather than a really slow bootstrap).

Whew, I think I have it. One tst instruction eliminated when it
shouldn't have been:

        move.w %a4,%d0
-       tst.b %d0
-       jeq .L352
+       jeq .L353

And the reason - that's a movqi using move.w. The following should fix
it. I'll run a few more tests, and then check it all in as Jeff
suggested if things looks OK.


Bernd

diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
index c72325fa4ab..8d010ebe6e9 100644
--- a/gcc/config/m68k/m68k.c
+++ b/gcc/config/m68k/m68k.c
@@ -3314,7 +3314,11 @@ output_move_qimode (rtx *operands)
   /* 68k family (including the 5200 ColdFire) does not support byte moves to
      from address registers.  */
   if (ADDRESS_REG_P (operands[0]) || ADDRESS_REG_P (operands[1]))
-    return "move%.w %1,%0";
+    {
+      if (ADDRESS_REG_P (operands[1]))
+	CC_STATUS_INIT;
+      return "move%.w %1,%0";
+    }
   return "move%.b %1,%0";
 }