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From-SVN: r571
This commit is contained in:
Richard Kenner 1992-03-22 17:38:23 -05:00
parent 13a07c7126
commit c160c628f1
1 changed files with 45 additions and 7 deletions
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52
gcc/loop.c
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@ -1458,6 +1458,34 @@ rtx_equal_for_loop_p (x, y, movables)
return 1;
}
/* If X contains any LABEL_REF's, add REG_LABEL notes for them to all
insns in INSNS which use thet reference. */
static void
add_label_notes (x, insns)
rtx x;
rtx insns;
{
enum rtx_code code = GET_CODE (x);
int i;
char *fmt;
rtx insn;
if (code == LABEL_REF)
{
for (insn = insns; insn; insn = NEXT_INSN (insn))
if (reg_mentioned_p (XEXP (x, 0), insn))
REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_LABEL, XEXP (x, 0),
REG_NOTES (insn));
return;
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
if (fmt[i] == 'e')
add_label_notes (XEXP (x, i), insns);
}
/* Scan MOVABLES, and move the insns that deserve to be moved.
If two matching movables are combined, replace one reg with the
other throughout. */
@ -1635,10 +1663,12 @@ move_movables (movables, threshold, insn_count, loop_start, end, nregs)
start_sequence ();
emit_move_insn (m->set_dest, m->set_src);
temp = gen_sequence ();
temp = get_insns ();
end_sequence ();
i1 = emit_insn_before (temp, loop_start);
add_label_notes (m->set_src, temp);
i1 = emit_insns_before (temp, loop_start);
if (! find_reg_note (i1, REG_EQUAL, 0))
REG_NOTES (i1)
= gen_rtx (EXPR_LIST,
@ -4504,11 +4534,19 @@ update_giv_derive (p)
be able to compute a compensation. */
else if (biv->insn == p)
{
if (biv->mult_val == const1_rtx
&& (tem = simplify_giv_expr (gen_rtx (MULT, giv->mode,
biv->add_val,
giv->mult_val),
&dummy)))
tem = 0;
if (biv->mult_val == const1_rtx)
tem = simplify_giv_expr (gen_rtx (MULT, giv->mode,
biv->add_val,
giv->mult_val),
&dummy);
if (tem && giv->derive_adjustment)
tem = simplify_giv_expr (gen_rtx (PLUS, giv->mode, tem,
giv->derive_adjustment),
&dummy);
if (tem)
giv->derive_adjustment = tem;
else
giv->cant_derive = 1;