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flow.c (EH_USES): Provide default. 

* flow.c (EH_USES): Provide default.
        (calculate_global_regs_live): Use it for EH edges and noreturn calls.
        * doc/tm.texi (EH_USES): New.

        * config/ia64/ia64.c (ia64_eh_uses): New.
        * config/ia64/ia64-protos.h: Update.
        * config/ia64/ia64.h (EH_USES): New.

From-SVN: r51058
This commit is contained in:
Richard Henderson 2002-03-19 18:08:14 -08:00 committed by Richard Henderson
parent d82fb1fa54
commit bfc23077d9
6 changed files with 85 additions and 14 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2002-03-19 Richard Henderson <rth@redhat.com>
* flow.c (EH_USES): Provide default.
(calculate_global_regs_live): Use it for EH edges and noreturn calls.
* doc/tm.texi (EH_USES): New.
* config/ia64/ia64.c (ia64_eh_uses): New.
* config/ia64/ia64-protos.h: Update.
* config/ia64/ia64.h (EH_USES): New.
2002-03-20 Alan Modra <amodra@bigpond.net.au>
* defaults.h (SUPPORTS_WEAK): Set if ASM_WEAKEN_DECL.

1
gcc/config/ia64/ia64-protos.h
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@ -122,6 +122,7 @@ extern void ia64_encode_section_info PARAMS((tree));
extern int ia64_register_move_cost PARAMS((enum machine_mode, enum reg_class,
enum reg_class));
extern int ia64_epilogue_uses PARAMS((int));
extern int ia64_eh_uses PARAMS((int));
extern void emit_safe_across_calls PARAMS((FILE *));
extern void ia64_init_builtins PARAMS((void));
extern void ia64_override_options PARAMS((void));

28
gcc/config/ia64/ia64.c
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@ -6815,6 +6815,34 @@ ia64_epilogue_uses (regno)
return 0;
}
}
/* Return true if REGNO is used by the frame unwinder. */
int
ia64_eh_uses (regno)
int regno;
{
if (! reload_completed)
return 0;
if (current_frame_info.reg_save_b0
&& regno == current_frame_info.reg_save_b0)
return 1;
if (current_frame_info.reg_save_pr
&& regno == current_frame_info.reg_save_pr)
return 1;
if (current_frame_info.reg_save_ar_pfs
&& regno == current_frame_info.reg_save_ar_pfs)
return 1;
if (current_frame_info.reg_save_ar_unat
&& regno == current_frame_info.reg_save_ar_unat)
return 1;
if (current_frame_info.reg_save_ar_lc
&& regno == current_frame_info.reg_save_ar_lc)
return 1;
return 0;
}
/* For ia64, SYMBOL_REF_FLAG set means that it is a function.

4
gcc/config/ia64/ia64.h
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@ -1412,6 +1412,10 @@ do { \
#define EPILOGUE_USES(REGNO) ia64_epilogue_uses (REGNO)
/* Nonzero for registers used by the exception handling mechanism. */
#define EH_USES(REGNO) ia64_eh_uses (REGNO)
/* Output at beginning of assembler file. */
#define ASM_FILE_START(FILE) \

6
gcc/doc/tm.texi
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@ -3956,6 +3956,12 @@ Define this macro as a C expression that is nonzero for registers that are
used by the epilogue or the @samp{return} pattern. The stack and frame
pointer registers are already be assumed to be used as needed.
@findex EH_USES
@item EH_USES (@var{regno})
Define this macro as a C expression that is nonzero for registers that are
used by the exception handling mechanism, and so should be considered live
on entry to an exception edge.
@findex DELAY_SLOTS_FOR_EPILOGUE
@item DELAY_SLOTS_FOR_EPILOGUE
Define this macro if the function epilogue contains delay slots to which

50
gcc/flow.c
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@ -167,6 +167,9 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#ifndef EPILOGUE_USES
#define EPILOGUE_USES(REGNO) 0
#endif
#ifndef EH_USES
#define EH_USES(REGNO) 0
#endif
#ifdef HAVE_conditional_execution
#ifndef REVERSE_CONDEXEC_PREDICATES_P
@ -1111,21 +1114,40 @@ calculate_global_regs_live (blocks_in, blocks_out, flags)
/* Begin by propagating live_at_start from the successor blocks. */
CLEAR_REG_SET (new_live_at_end);
for (e = bb->succ; e; e = e->succ_next)
{
basic_block sb = e->dest;
/* Call-clobbered registers die across exception and call edges. */
/* ??? Abnormal call edges ignored for the moment, as this gets
confused by sibling call edges, which crashes reg-stack. */
if (e->flags & EDGE_EH)
{
bitmap_operation (tmp, sb->global_live_at_start,
call_used, BITMAP_AND_COMPL);
IOR_REG_SET (new_live_at_end, tmp);
}
else
IOR_REG_SET (new_live_at_end, sb->global_live_at_start);
if (bb->succ)
for (e = bb->succ; e; e = e->succ_next)
{
basic_block sb = e->dest;
/* Call-clobbered registers die across exception and
call edges. */
/* ??? Abnormal call edges ignored for the moment, as this gets
confused by sibling call edges, which crashes reg-stack. */
if (e->flags & EDGE_EH)
{
bitmap_operation (tmp, sb->global_live_at_start,
call_used, BITMAP_AND_COMPL);
IOR_REG_SET (new_live_at_end, tmp);
}
else
IOR_REG_SET (new_live_at_end, sb->global_live_at_start);
/* If a target saves one register in another (instead of on
the stack) the save register will need to be live for EH. */
if (e->flags & EDGE_EH)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (EH_USES (i))
SET_REGNO_REG_SET (new_live_at_end, i);
}
else
{
/* This might be a noreturn function that throws. And
even if it isn't, getting the unwind info right helps
debugging. */
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (EH_USES (i))
SET_REGNO_REG_SET (new_live_at_end, i);
}
/* The all-important stack pointer must always be live. */