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reload1.c (verify_initial_offsets): New function.

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* reload1.c (verify_initial_offsets): New function.
        (reload): Call it after reload_as_needed.  Also verify that the frame
        size stays constant during reload_as_needed.
        * i386.h (CONST_DOUBLE_OK_FOR_LETTER_P): Undo Jul 26 change.

From-SVN: r23378
This commit is contained in:
Bernd Schmidt 1998-10-27 23:35:41 +00:00 committed by Jeff Law
parent 0304f7877c
commit c47f5ea57b
3 changed files with 44 additions and 12 deletions
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5
gcc/ChangeLog
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@ -12,6 +12,11 @@ Wed Oct 28 00:10:35 1998 Jeffrey A Law (law@cygnus.com)
Tue Oct 27 23:32:34 1998 Bernd Schmidt <crux@pool.informatik.rwth-aachen.de>
* reload1.c (verify_initial_offsets): New function.
(reload): Call it after reload_as_needed. Also verify that the frame
size stays constant during reload_as_needed.
* i386.h (CONST_DOUBLE_OK_FOR_LETTER_P): Undo Jul 26 change.
* reload.h (struct insn_chain): Add need_operand_change element.
* reload1.c (new_insn_chain): Clear it.
(calculate_needs_all_insns): Set it; don't overload need_reload.

13
gcc/config/i386/i386.h
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@ -891,19 +891,10 @@ enum reg_class
/* Similar, but for floating constants, and defining letters G and H.
Here VALUE is the CONST_DOUBLE rtx itself. We allow constants even if
TARGET_387 isn't set, because the stack register converter may need to
load 0.0 into the function value register.
We disallow these constants when -fomit-frame-pointer and compiling
PIC code since reload might need to force the constant to memory.
Forcing the constant to memory changes the elimination offsets after
the point where they must stay constant.
However, we must allow them after reload as completed as reg-stack.c
will create insns which use these constants. */
load 0.0 into the function value register. */
#define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
(((reload_completed || !flag_pic || !flag_omit_frame_pointer) && (C) == 'G') \
? standard_80387_constant_p (VALUE) : 0)
((C) == 'G' ? standard_80387_constant_p (VALUE) : 0)
/* Place additional restrictions on the register class to use when it
is necessary to be able to hold a value of mode MODE in a reload

38
gcc/reload1.c
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@ -377,6 +377,7 @@ static int eliminate_regs_in_insn PROTO((rtx, int));
static void update_eliminable_offsets PROTO((void));
static void mark_not_eliminable PROTO((rtx, rtx));
static void set_initial_elim_offsets PROTO((void));
static void verify_initial_elim_offsets PROTO((void));
static void init_elim_table PROTO((void));
static void update_eliminables PROTO((HARD_REG_SET *));
static void spill_hard_reg PROTO((int, FILE *, int));
@ -970,7 +971,17 @@ reload (first, global, dumpfile)
if (insns_need_reload != 0 || something_needs_elimination
|| something_needs_operands_changed)
reload_as_needed (global);
{
int old_frame_size = get_frame_size ();
reload_as_needed (global);
if (old_frame_size != get_frame_size ())
abort ();
if (num_eliminable)
verify_initial_elim_offsets ();
}
/* If we were able to eliminate the frame pointer, show that it is no
longer live at the start of any basic block. If it ls live by
@ -3422,6 +3433,31 @@ mark_not_eliminable (dest, x)
}
}
/* Verify that the initial elimination offsets did not change since the
last call to set_initial_elim_offsets. This is used to catch cases
where something illegal happened during reload_as_needed that could
cause incorrect code to be generated if we did not check for it. */
static void
verify_initial_elim_offsets ()
{
int t;
#ifdef ELIMINABLE_REGS
struct elim_table *ep;
for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)
{
INITIAL_ELIMINATION_OFFSET (ep->from, ep->to, t);
if (t != ep->initial_offset)
abort ();
}
#else
INITIAL_FRAME_POINTER_OFFSET (t);
if (t != reg_eliminate[0].initial_offset)
abort ();
#endif
}
/* Reset all offsets on eliminable registers to their initial values. */
static void
set_initial_elim_offsets ()