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TImode support for powerpc64-darwin

This patch adds TImode support for powerpc64-darwin.

default_scalar_mode_supported_p already had TImode listed as
supported, with this comment:

   Special case, here, is the double-word arithmetic
   supported by optabs.c.

and this code:

      if (precision == 2 * BITS_PER_WORD)
	return true;

because BITS_PER_WORD is 64 on powerpc64-darwin.

However, optabs doesn't know how to handle *many* of the required
operations.  So, in order to make this work, libgcc needs to have the
appropriate TImode functions; and so the rs6000.h change.  Then it
turns out that libgcc doesn't have support for a bunch of operations,
which as it happens have already been implemented in ppc64-fp.c for
rs6000.  Then, the rs6000.h change caused many DImode functions (which
shouldn't have been there in the first place) to be removed from
libgcc, which is a potential binary compatibility problem, and so a
new darwin-ppc64.c is required to ensure those are supplied.

I'm fairly sure that every step in that chain is bogus in some way.

Anyway, here's the patch.

Since this adds a new feature, and is certainly not a regression fix,
and has ABI concerns, I will put this on hold for 4.3.

- Geoffrey Keating <>

===File ~/patches/gcc-rs6000-ppc64timode.patch==============
2006-08-16  Geoffrey Keating  <>

	* config/rs6000/rs6000.h [IN_LIBGCC2] (TARGET_POWERPC64): Define
	to 1 when __ppc64__ is defined.
	* config/rs6000/t-darwin (LIB2FUNCS_EXTRA): Add ppc64-fp.c and
	* config/rs6000/ppc64-fp.c: Also compile when __ppc64__ is defined.
	* config/rs6000/darwin-ppc64.c: New.

Index: gcc/config/rs6000/t-darwin
--- gcc/config/rs6000/t-darwin	(revision 115424)
+++ gcc/config/rs6000/t-darwin	(working copy)
@@ -1,4 +1,6 @@
 LIB2FUNCS_EXTRA = $(srcdir)/config/rs6000/darwin-tramp.asm \
+	$(srcdir)/config/rs6000/ppc64-fp.c \
+	$(srcdir)/config/rs6000/darwin-ppc64.c \
Index: gcc/config/rs6000/rs6000.h
--- gcc/config/rs6000/rs6000.h	(revision 115470)
+++ gcc/config/rs6000/rs6000.h	(working copy)
@@ -178,7 +178,7 @@
 #ifdef IN_LIBGCC2
 /* For libgcc2 we make sure this is a compile time constant */
-#if defined (__64BIT__) || defined (__powerpc64__)
+#if defined (__64BIT__) || defined (__powerpc64__) || defined (__ppc64__)
 #define TARGET_POWERPC64	1
Index: gcc/config/rs6000/ppc64-fp.c
--- gcc/config/rs6000/ppc64-fp.c	(revision 115424)
+++ gcc/config/rs6000/ppc64-fp.c	(working copy)
@@ -30,7 +30,7 @@
 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
 02110-1301, USA.  */
-#if defined(__powerpc64__) || defined (__64BIT__)
+#if defined(__powerpc64__) || defined (__64BIT__) || defined(__ppc64__)
 #define TMODES
 #include "config/fp-bit.h"
Index: gcc/config/rs6000/darwin-ppc64.c
--- gcc/config/rs6000/darwin-ppc64.c	(revision 0)
+++ gcc/config/rs6000/darwin-ppc64.c	(revision 0)
@@ -0,0 +1,77 @@
+/* Functions shipped in the ppc64 version of libgcc_s.1.dylib 
+   in older Mac OS X versions, preserved for backwards compatibility.
+   Copyright (C) 2006  Free Software Foundation, Inc.
+This file is part of GCC.
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.  */
+#ifdef __ppc64__
+/* Many of these functions have probably never been used by anyone
+   anywhere on ppc64, but it's hard to prove this, so they're defined
+   here.  None are actually necessary, as demonstrated below by defining
+   each function using the operation it implements.  */
+typedef long DI;
+typedef unsigned long uDI;
+typedef int SI;
+typedef unsigned int uSI;
+typedef int word_type __attribute__ ((mode (__word__)));
+DI __ashldi3 (DI x, word_type c);
+DI __ashrdi3 (DI x, word_type c);
+int __clzsi2 (uSI x);
+word_type __cmpdi2 (DI x, DI y);
+int __ctzsi2 (uSI x);
+DI __divdi3 (DI x, DI y);
+uDI __lshrdi3 (uDI x, word_type c);
+DI __moddi3 (DI x, DI y);
+DI __muldi3 (DI x, DI y);
+DI __negdi2 (DI x);
+int __paritysi2 (uSI x);
+int __popcountsi2 (uSI x);
+word_type __ucmpdi2 (uDI x, uDI y);
+uDI __udivdi3 (uDI x, uDI y);
+uDI __udivmoddi4 (uDI x, uDI y, uDI *r);
+uDI __umoddi3 (uDI x, uDI y);
+DI __ashldi3 (DI x, word_type c) { return x << c; }
+DI __ashrdi3 (DI x, word_type c) { return x >> c; }
+int __clzsi2 (uSI x) { return __builtin_clz (x); }
+word_type __cmpdi2 (DI x, DI y) { return x < y ? 0 : x == y ? 1 : 2; }
+int __ctzsi2 (uSI x) { return __builtin_ctz (x); }
+DI __divdi3 (DI x, DI y) { return x / y; }
+uDI __lshrdi3 (uDI x, word_type c) { return x >> c; }
+DI __moddi3 (DI x, DI y) { return x % y; }
+DI __muldi3 (DI x, DI y) { return x * y; }
+DI __negdi2 (DI x) { return -x; }
+int __paritysi2 (uSI x) { return __builtin_parity (x); }
+int __popcountsi2 (uSI x) { return __builtin_popcount (x); }
+word_type __ucmpdi2 (uDI x, uDI y) { return x < y ? 0 : x == y ? 1 : 2; }
+uDI __udivdi3 (uDI x, uDI y) { return x / y; }
+uDI __udivmoddi4 (uDI x, uDI y, uDI *r) { *r = x % y; return x / y; }
+uDI __umoddi3 (uDI x, uDI y) { return x % y; }
+#endif /* __ppc64__ */

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