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-rw-r--r--devel/avr-gcc-3/files/patch-16bitassign300
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diff --git a/devel/avr-gcc-3/files/patch-16bitassign b/devel/avr-gcc-3/files/patch-16bitassign
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-From marekm@amelek.gda.pl Sun Jan 19 02:37:50 2003
-Path: interface-business.de!not-for-mail
-Newsgroups: local.avr.gcc
-Followup-To: poster
-Reply-To: avr-gcc-list@avr1.org
-Subject: [avr-gcc-list] Patch for indirect 16-bit I/O
-To: avr-gcc-list@avr1.org
-X-Mailer: ELM [version 2.4ME+ PL95 (25)]
-MIME-Version: 1.0
-Content-Transfer-Encoding: 7bit
-Content-Type: text/plain; charset=US-ASCII
-Message-ID: <E18a4PG-0004Cs-00@alf.amelek.gda.pl>
-From: Marek Michalkiewicz <marekm@amelek.gda.pl>
-Sender: owner-avr-gcc-list@avr1.org
-Precedence: bulk
-Date: Sun, 19 Jan 2003 02:37:50 +0100 (CET)
-Lines: 280
-Xref: interface-business.de local.avr.gcc:2452
-
-Hi,
-
-This should handle all these 16-bit I/O accesses addressed with
-pointers ("volatile" is required to force writing high byte first
-and reading low byte first in absolutely all cases, even if that
-makes the code less efficient). The patch is for CVS mainline, but
-should apply cleanly to the 3.3 branch too. I'm not committing it
-to GCC CVS just yet - please test, I haven't... well, it compiles :)
-
-BTW, mainline currently requires that SEEK_{SET,CUR,END} are
-defined in <stdio.h> - otherwise some new libgcc2.c stuff (unused
-on the AVR, but it has to compile) will cause the build to fail.
-Just edit /usr/local/avr/include/stdio.h to add them manually...
-
-Marek
-
-
-Index: gcc/config/avr/avr.c
-===================================================================
-RCS file: /cvs/gcc/gcc/gcc/config/avr/avr.c,v
-retrieving revision 1.87
-diff -c -3 -p -r1.87 avr.c
-*** gcc/config/avr/avr.c 16 Dec 2002 18:20:58 -0000 1.87
---- gcc/config/avr/avr.c 19 Jan 2003 01:07:52 -0000
-*************** print_operand (file, x, code)
-*** 1138,1143 ****
---- 1138,1153 ----
-
- print_operand (file, XEXP (addr, 1), 0);
- }
-+ else if (code == 'p' || code == 'r')
-+ {
-+ if (GET_CODE (addr) != POST_INC && GET_CODE (addr) != PRE_DEC)
-+ fatal_insn ("bad address, not post_inc or pre_dec:", addr);
-+
-+ if (code == 'p')
-+ print_operand_address (file, XEXP (addr, 0)); /* X, Y, Z */
-+ else
-+ print_operand (file, XEXP (addr, 0), 0); /* r26, r28, r30 */
-+ }
- else if (GET_CODE (addr) == PLUS)
- {
- print_operand_address (file, XEXP (addr,0));
-*************** out_movhi_r_mr (insn, op, l)
-*** 1944,1949 ****
---- 1954,1962 ----
- rtx base = XEXP (src, 0);
- int reg_dest = true_regnum (dest);
- int reg_base = true_regnum (base);
-+ /* "volatile" forces reading low byte first, even if less efficient,
-+ for correct operation with 16-bit I/O registers. */
-+ int mem_volatile_p = MEM_VOLATILE_P (src);
- int tmp;
-
- if (!l)
-*************** out_movhi_r_mr (insn, op, l)
-*** 2037,2042 ****
---- 2050,2074 ----
- if (reg_overlap_mentioned_p (dest, XEXP (base, 0)))
- fatal_insn ("incorrect insn:", insn);
-
-+ if (mem_volatile_p)
-+ {
-+ if (REGNO (XEXP (base, 0)) == REG_X)
-+ {
-+ *l = 4;
-+ return (AS2 (sbiw,r26,2) CR_TAB
-+ AS2 (ld,%A0,X+) CR_TAB
-+ AS2 (ld,%B0,X) CR_TAB
-+ AS2 (sbiw,r26,1));
-+ }
-+ else
-+ {
-+ *l = 3;
-+ return (AS2 (sbiw,%r1,2) CR_TAB
-+ AS2 (ld,%A0,%p1) CR_TAB
-+ AS2 (ldd,%B0,%p1+1));
-+ }
-+ }
-+
- *l = 2;
- return (AS2 (ld,%B0,%1) CR_TAB
- AS2 (ld,%A0,%1));
-*************** out_movhi_mr_r (insn, op, l)
-*** 2668,2674 ****
---- 2700,2710 ----
- rtx base = XEXP (dest, 0);
- int reg_base = true_regnum (base);
- int reg_src = true_regnum (src);
-+ /* "volatile" forces writing high byte first, even if less efficient,
-+ for correct operation with 16-bit I/O registers. */
-+ int mem_volatile_p = MEM_VOLATILE_P (dest);
- int tmp;
-+
- if (!l)
- l = &tmp;
- if (CONSTANT_ADDRESS_P (base))
-*************** out_movhi_mr_r (insn, op, l)
-*** 2688,2720 ****
- {
- if (reg_src == REG_X)
- {
-! /* "st X+,r26" is undefined */
-! if (reg_unused_after (insn, src))
- return *l=4, (AS2 (mov,__tmp_reg__,r27) CR_TAB
- AS2 (st,X,r26) CR_TAB
- AS2 (adiw,r26,1) CR_TAB
- AS2 (st,X,__tmp_reg__));
- else
- return *l=5, (AS2 (mov,__tmp_reg__,r27) CR_TAB
-- AS2 (st,X,r26) CR_TAB
- AS2 (adiw,r26,1) CR_TAB
- AS2 (st,X,__tmp_reg__) CR_TAB
-! AS2 (sbiw,r26,1));
- }
- else
- {
-! if (reg_unused_after (insn, base))
- return *l=2, (AS2 (st,X+,%A1) CR_TAB
- AS2 (st,X,%B1));
- else
-! return *l=3, (AS2 (st ,X+,%A1) CR_TAB
-! AS2 (st ,X,%B1) CR_TAB
-! AS2 (sbiw,r26,1));
- }
- }
- else
-! return *l=2, (AS2 (st ,%0,%A1) CR_TAB
-! AS2 (std,%0+1,%B1));
- }
- else if (GET_CODE (base) == PLUS)
- {
---- 2724,2756 ----
- {
- if (reg_src == REG_X)
- {
-! /* "st X+,r26" and "st -X,r26" are undefined. */
-! if (!mem_volatile_p && reg_unused_after (insn, src))
- return *l=4, (AS2 (mov,__tmp_reg__,r27) CR_TAB
- AS2 (st,X,r26) CR_TAB
- AS2 (adiw,r26,1) CR_TAB
- AS2 (st,X,__tmp_reg__));
- else
- return *l=5, (AS2 (mov,__tmp_reg__,r27) CR_TAB
- AS2 (adiw,r26,1) CR_TAB
- AS2 (st,X,__tmp_reg__) CR_TAB
-! AS2 (sbiw,r26,1) CR_TAB
-! AS2 (st,X,r26));
- }
- else
- {
-! if (!mem_volatile_p && reg_unused_after (insn, base))
- return *l=2, (AS2 (st,X+,%A1) CR_TAB
- AS2 (st,X,%B1));
- else
-! return *l=3, (AS2 (adiw,r26,1) CR_TAB
-! AS2 (st,X,%B1) CR_TAB
-! AS2 (st,-X,%A1));
- }
- }
- else
-! return *l=2, (AS2 (std,%0+1,%B1) CR_TAB
-! AS2 (st,%0,%A1));
- }
- else if (GET_CODE (base) == PLUS)
- {
-*************** out_movhi_mr_r (insn, op, l)
-*** 2727,2740 ****
-
- if (disp <= 63 + MAX_LD_OFFSET (GET_MODE (dest)))
- return *l = 4, (AS2 (adiw,r28,%o0-62) CR_TAB
-- AS2 (std,Y+62,%A1) CR_TAB
- AS2 (std,Y+63,%B1) CR_TAB
- AS2 (sbiw,r28,%o0-62));
-
- return *l = 6, (AS2 (subi,r28,lo8(-%o0)) CR_TAB
- AS2 (sbci,r29,hi8(-%o0)) CR_TAB
-- AS2 (st,Y,%A1) CR_TAB
- AS2 (std,Y+1,%B1) CR_TAB
- AS2 (subi,r28,lo8(%o0)) CR_TAB
- AS2 (sbci,r29,hi8(%o0)));
- }
---- 2763,2776 ----
-
- if (disp <= 63 + MAX_LD_OFFSET (GET_MODE (dest)))
- return *l = 4, (AS2 (adiw,r28,%o0-62) CR_TAB
- AS2 (std,Y+63,%B1) CR_TAB
-+ AS2 (std,Y+62,%A1) CR_TAB
- AS2 (sbiw,r28,%o0-62));
-
- return *l = 6, (AS2 (subi,r28,lo8(-%o0)) CR_TAB
- AS2 (sbci,r29,hi8(-%o0)) CR_TAB
- AS2 (std,Y+1,%B1) CR_TAB
-+ AS2 (st,Y,%A1) CR_TAB
- AS2 (subi,r28,lo8(%o0)) CR_TAB
- AS2 (sbci,r29,hi8(%o0)));
- }
-*************** out_movhi_mr_r (insn, op, l)
-*** 2746,2772 ****
- *l = 7;
- return (AS2 (mov,__tmp_reg__,r26) CR_TAB
- AS2 (mov,__zero_reg__,r27) CR_TAB
-! AS2 (adiw,r26,%o0) CR_TAB
-! AS2 (st,X+,__tmp_reg__) CR_TAB
- AS2 (st,X,__zero_reg__) CR_TAB
- AS1 (clr,__zero_reg__) CR_TAB
-! AS2 (sbiw,r26,%o0+1));
- }
- *l = 4;
-! return (AS2 (adiw,r26,%o0) CR_TAB
-! AS2 (st,X+,%A1) CR_TAB
-! AS2 (st,X,%B1) CR_TAB
-! AS2 (sbiw,r26,%o0+1));
- }
-! return *l=2, (AS2 (std,%A0,%A1) CR_TAB
-! AS2 (std,%B0,%B1));
- }
- else if (GET_CODE (base) == PRE_DEC) /* (--R) */
- return *l=2, (AS2 (st,%0,%B1) CR_TAB
- AS2 (st,%0,%A1));
- else if (GET_CODE (base) == POST_INC) /* (R++) */
-! return *l=2, (AS2 (st,%0,%A1) CR_TAB
-! AS2 (st,%0,%B1));
- fatal_insn ("unknown move insn:",insn);
- return "";
- }
---- 2782,2830 ----
- *l = 7;
- return (AS2 (mov,__tmp_reg__,r26) CR_TAB
- AS2 (mov,__zero_reg__,r27) CR_TAB
-! AS2 (adiw,r26,%o0+1) CR_TAB
- AS2 (st,X,__zero_reg__) CR_TAB
-+ AS2 (st,-X,__tmp_reg__) CR_TAB
- AS1 (clr,__zero_reg__) CR_TAB
-! AS2 (sbiw,r26,%o0));
- }
- *l = 4;
-! return (AS2 (adiw,r26,%o0+1) CR_TAB
-! AS2 (st,X,%B1) CR_TAB
-! AS2 (st,-X,%A1) CR_TAB
-! AS2 (sbiw,r26,%o0));
- }
-! return *l=2, (AS2 (std,%B0,%B1) CR_TAB
-! AS2 (std,%A0,%A1));
- }
- else if (GET_CODE (base) == PRE_DEC) /* (--R) */
- return *l=2, (AS2 (st,%0,%B1) CR_TAB
- AS2 (st,%0,%A1));
- else if (GET_CODE (base) == POST_INC) /* (R++) */
-! {
-! if (mem_volatile_p)
-! {
-! if (REGNO (XEXP (base, 0)) == REG_X)
-! {
-! *l = 4;
-! return (AS2 (adiw,r26,1) CR_TAB
-! AS2 (st,X,%B1) CR_TAB
-! AS2 (st,-X,%A1) CR_TAB
-! AS2 (adiw,r26,2));
-! }
-! else
-! {
-! *l = 3;
-! return (AS2 (std,%p0+1,%B1) CR_TAB
-! AS2 (st,%p0,%A1) CR_TAB
-! AS2 (adiw,%r0,2));
-! }
-! }
-!
-! *l = 2;
-! return (AS2 (st,%0,%A1) CR_TAB
-! AS2 (st,%0,%B1));
-! }
- fatal_insn ("unknown move insn:",insn);
- return "";
- }
-
-
-
-avr-gcc-list at http://avr1.org
-
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