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reload1.c (reload_as_needed): Set reload_is_output_reload / reload_has_output_reload for auto_inc expressions...

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* reload1.c (reload_as_needed): Set reload_is_output_reload /
	reload_has_output_reload for auto_inc expressions that could be
	reloaded.  Call forget_old_reloads for REG_INC notes.

From-SVN: r25899
This commit is contained in:
J"orn Rennecke 1999-03-22 14:27:23 +00:00 committed by Joern Rennecke
parent 50270076bd
commit 02eb1393dc
2 changed files with 32 additions and 7 deletions

6
gcc/ChangeLog

@ -1,3 +1,9 @@
Mon Mar 22 22:24:30 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* reload1.c (reload_as_needed): Set reload_is_output_reload /
reload_has_output_reload for auto_inc expressions that could be
reloaded. Call forget_old_reloads for REG_INC notes.
Mon Mar 22 21:51:57 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* cse.c (cse_insn): Don't change the result register of a libcall.

33
gcc/reload1.c

@ -4414,17 +4414,37 @@ reload_as_needed (live_known)
break;
}
if (n == 1)
REG_NOTES (p) = gen_rtx_EXPR_LIST (REG_INC, reload_reg,
REG_NOTES (p));
{
REG_NOTES (p)
= gen_rtx_EXPR_LIST (REG_INC, reload_reg,
REG_NOTES (p));
/* Mark this as having an output reload so that the
REG_INC processing code below won't invalidate
the reload for inheritance. */
SET_HARD_REG_BIT (reg_is_output_reload,
REGNO (reload_reg));
reg_has_output_reload[REGNO (XEXP (in_reg, 0))] = 1;
}
else
forget_old_reloads_1 (XEXP (in_reg, 0), NULL_RTX);
}
else if ((code == PRE_INC || code == PRE_DEC)
&& TEST_HARD_REG_BIT (reg_reloaded_valid,
REGNO (reload_reg_rtx[i]))
/* Make sure it is the inc/dec pseudo, and not
some other (e.g. output operand) pseudo. */
&& (reg_reloaded_contents[REGNO (reload_reg_rtx[i])]
== REGNO (XEXP (in_reg, 0))))
{
SET_HARD_REG_BIT (reg_is_output_reload,
REGNO (reload_reg_rtx[i]));
reg_has_output_reload[REGNO (XEXP (in_reg, 0))] = 1;
}
}
}
#if 0 /* ??? Is this code obsolete now? Need to check carefully. */
/* Likewise for regs altered by auto-increment in this insn.
But note that the reg-notes are not changed by reloading:
they still contain the pseudo-regs, not the spill regs. */
/* If a pseudo that got a hard register is auto-incremented,
we must purge records of copying it into pseudos without
hard registers. */
for (x = REG_NOTES (insn); x; x = XEXP (x, 1))
if (REG_NOTE_KIND (x) == REG_INC)
{
@ -4438,7 +4458,6 @@ reload_as_needed (live_known)
if (i == n_reloads)
forget_old_reloads_1 (XEXP (x, 0), NULL_RTX);
}
#endif
#endif
}
/* A reload reg's contents are unknown after a label. */