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* i386.c: Revert 07-30 ix86_output_main_function_alignment_hack.

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From-SVN: r44638
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Richard Henderson 2001-08-04 09:46:00 -07:00 committed by Richard Henderson
parent 8bbbef3434
commit 68c5782de8
2 changed files with 4 additions and 47 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2001-08-04 Richard Henderson <rth@redhat.com>
* i386.c: Revert 07-30 ix86_output_main_function_alignment_hack.
2001-08-04 Neil Booth <neil@daikokuya.demon.co.uk>
* cpphash.h (struct cpp_reader): New member directive_line.

47
gcc/config/i386/i386.c
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@ -574,7 +574,6 @@ static HOST_WIDE_INT ix86_GOT_alias_set PARAMS ((void));
static void ix86_adjust_counter PARAMS ((rtx, HOST_WIDE_INT));
static rtx ix86_expand_aligntest PARAMS ((rtx, int));
static void ix86_expand_strlensi_unroll_1 PARAMS ((rtx, rtx));
static void ix86_output_main_function_alignment_hack PARAMS ((FILE *f, int));
struct ix86_address
{
@ -640,10 +639,6 @@ static void sco_asm_named_section PARAMS ((const char *, unsigned int,
HOST_WIDE_INT));
# undef TARGET_ASM_FUNCTION_PROLOGUE
# define TARGET_ASM_FUNCTION_PROLOGUE ix86_osf_output_function_prologue
#else
# undef TARGET_ASM_FUNCTION_PROLOGUE
# define TARGET_ASM_FUNCTION_PROLOGUE \
ix86_output_main_function_alignment_hack
#endif
#undef TARGET_ASM_OPEN_PAREN
@ -10788,48 +10783,6 @@ ix86_memory_move_cost (mode, class, in)
}
}
/* Most of current runtimes (Jul 2001) do not align stack properly when
entering main, so emit an wrapper to align stack before the real main
code is called.
This can eventually go if we manage to fix the runtimes or teach gcc
to dynamically align stack in main automatically.
Adding check to configure is probably not good idea, as binarry can move
from one shared library to older. */
static void
ix86_output_main_function_alignment_hack (file, size)
FILE *file;
int size ATTRIBUTE_UNUSED;
{
rtx label;
char buf[256];
/* Check that we see main function with maximally 8 bytes of arguments.
if so, emit the hack to align stack for runtimes, where this constraint
is broken. */
if (strcmp (cfun->name, "main"))
return;
if (cfun->pops_args || cfun->args_size > 12)
return;
if (PREFERRED_STACK_BOUNDARY <= 2)
return;
label = gen_label_rtx ();
fprintf (file, "\tpushl\t%%ebp\n");
fprintf (file, "\tmovl\t%%esp, %%ebp\n");
fprintf (file, "\tandl\t$0xfffffff0, %%esp\n");
fprintf (file, "\tpushl\t%%ebp\n");
fprintf (file, "\tpushl\t16(%%ebp)\n");
fprintf (file, "\tpushl\t12(%%ebp)\n");
fprintf (file, "\tpushl\t8(%%ebp)\n");
fprintf (file, "\tcall\t");
ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (label));
assemble_name (file, buf);
fprintf (file, "\n\tleave\n");
fprintf (file, "\tret\n");
ASM_OUTPUT_INTERNAL_LABEL (file, "L", CODE_LABEL_NUMBER (label));
}
#if defined(TARGET_ELF) && defined(TARGET_COFF)
static void
sco_asm_named_section (name, flags, align)