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Subject: Re: [PATCH] Preemptible kernel for SH
From: Robert Love <rml@tech9.net>
To: jsiegel@mvista.com
Cc: linux-kernel@vger.kernel.org, linuxsh-dev@lists.sourceforge.net
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Users of gcc-3.x will need the attached patch _for gcc_ to compile an SH
kernel patched with preempt-kernel.  This is _not_ our fault, it is a
gcc bug and is now merged into CVS and should be part of gcc-3.1.

gcc-2.9x compiles without problem.  It is only 3.x versions that suffer
the bug.

	Robert Love

P.S. Also of note: yes this works on Sega Dreamcast.  You can have a
fully preemptible Dreamcast.  Impress your friends.  Or something.

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--- gcc/gcc/alias.c	2001/09/11 21:39:24	1.115.4.7
+++ gcc/gcc/alias.c	2001/11/18 08:16:38	1.115.4.8
@@ -1041,6 +1041,9 @@
   /* Some RTL can be compared without a recursive examination.  */
   switch (code)
     {
+    case VALUE:
+     return CSELIB_VAL_PTR (x) =3D=3D CSELIB_VAL_PTR (y);
+
     case REG:
       return REGNO (x) =3D=3D REGNO (y);
=20
@@ -1109,6 +1112,12 @@
 	  if (rtx_equal_for_memref_p (XEXP (x, i), XEXP (y, i)) =3D=3D 0)
 	    return 0;
 	  break;
+
+	  /* This can happen for asm operands.  */
+	case 's':
+	  if (strcmp (XSTR (x, i), XSTR (y, i)))
+	    return 0;
+	break;
=20
 	/* This can happen for an asm which clobbers memory.  */
 	case '0':

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