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flow.c (find_auto_inc): Don't autoinc eliminable registers.

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* flow.c (find_auto_inc): Don't autoinc eliminable registers.
	If the original source is dead in the incr insn, it's dead now.

From-SVN: r33150
This commit is contained in:
Richard Henderson 2000-04-14 10:38:35 -07:00 committed by Richard Henderson
parent b1ba4cc3a8
commit 6e62809688
2 changed files with 14 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-04-14 Richard Henderson <rth@cygnus.com>
* flow.c (find_auto_inc): Don't autoinc eliminable registers.
If the original source is dead in the incr insn, it's dead now.
Fri Apr 14 07:40:32 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* stor-layout.c (layout_decl): Properly compare KNOWN_ALIGN to

10
gcc/flow.c
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@ -4309,7 +4309,10 @@ find_auto_inc (pbi, x, insn)
? (offset ? PRE_INC : POST_INC)
: (offset ? PRE_DEC : POST_DEC));
if (dead_or_set_p (incr, addr))
if (dead_or_set_p (incr, addr)
/* Mustn't autoinc an eliminable register. */
&& (regno >= FIRST_PSEUDO_REGISTER
|| ! TEST_HARD_REG_BIT (elim_reg_set, regno)))
{
/* This is the simple case. Try to make the auto-inc. If
we can't, we are done. Otherwise, we will do any
@ -4410,6 +4413,11 @@ find_auto_inc (pbi, x, insn)
register. */
if (SET_DEST (set) == addr)
{
/* If the original source was dead, it's dead now. */
rtx note = find_reg_note (incr, REG_DEAD, NULL_RTX);
if (note && XEXP (note, 0) != addr)
SET_REGNO_REG_SET (pbi->new_dead, REGNO (XEXP (note, 0)));
PUT_CODE (incr, NOTE);
NOTE_LINE_NUMBER (incr) = NOTE_INSN_DELETED;
NOTE_SOURCE_FILE (incr) = 0;