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M68K alignment patch....
- To: gcc-patches at gcc dot gnu dot org
- Subject: M68K alignment patch....
- From: Paul Breed <Paul at Netburner dot com>
- Date: Mon, 02 Apr 2001 18:13:21 -0400
The asm(.align xx); trick only works in C files not cpp.
The __attribute__((aligned(xx))) which gcc docs claim you should be using
fails with a warning
directive with the current compiler, I have fixed this by adding the following:
#define MAX_OFILE_ALIGNMENT 128
in .....gcc\config\m68k\m68k.h
This allows one to specify alignments up to 16 bytes.
(16 byte alignment is needed for the Ethernet stuff in the new 5272)
I have been using this change for about three months and it seems to do
what it claims and introduce no bugs.
Paul
diff -N -P -c -r gcc-2.95.3.orig/gcc/config/m68k/m68k.h gcc-2.95.3/gcc/config/m68k/m68k.h *** gcc-2.95.3.orig/gcc/config/m68k/m68k.h Thu Jan 25 14:03:34 2001 --- gcc-2.95.3/gcc/config/m68k/m68k.h Mon Apr 2 22:35:28 2001 *************** *** 2083,2088 **** --- 2083,2093 ---- #define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address (FILE, ADDR) + /* The maximum alignment which the object file format can support. */ + #undef MAX_OFILE_ALIGNMENT + #define MAX_OFILE_ALIGNMENT 128 + + /* Define functions defined in aux-output.c and used in templates. */ extern char *output_move_const_into_data_reg ();