+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
? (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
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;