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* jump.c (jump_optimize_1): Validate the cmov copy to a temporary.

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From-SVN: r27788
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Richard Henderson 1999-06-26 19:39:42 -07:00 committed by Richard Henderson
parent e2b2063128
commit 9da8a3ae97
2 changed files with 42 additions and 19 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
Sun Jun 27 02:39:08 1999 Richard Henderson <rth@cygnus.com>
* jump.c (jump_optimize_1): Validate the cmov copy to a temporary.
Sat Jun 26 17:18:18 1999 David Edelsohn <edelsohn@gnu.org>
* rs6000.c (print_operand, case 'L'): Use plus_constant_for_output.

57
gcc/jump.c
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@ -970,7 +970,8 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
if (target)
{
rtx seq1,seq2,last;
rtx seq1, seq2, last;
int copy_ok;
/* Save the conditional move sequence but don't emit it
yet. On some machines, like the alpha, it is possible
@ -980,8 +981,9 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
seq2 = get_insns ();
end_sequence ();
/* Now that we can't fail, generate the copy insns that
preserve the compared values. */
/* "Now that we can't fail..." Famous last words.
Generate the copy insns that preserve the compared
values. */
start_sequence ();
emit_move_insn (cond0, XEXP (temp4, 0));
if (cond1 != XEXP (temp4, 1))
@ -989,25 +991,42 @@ jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only)
seq1 = get_insns ();
end_sequence ();
emit_insns_before (seq1, temp5);
/* Insert conditional move after insn, to be sure that
the jump and a possible compare won't be separated */
last = emit_insns_after (seq2, insn);
/* Validate the sequence -- this may be some weird
bit-extract-and-test instruction for which there
exists no complimentary bit-extract insn. */
copy_ok = 1;
for (last = seq1; last ; last = NEXT_INSN (last))
if (recog_memoized (last) < 0)
{
copy_ok = 0;
break;
}
/* ??? We can also delete the insn that sets X to A.
Flow will do it too though. */
delete_insn (temp);
next = NEXT_INSN (insn);
delete_jump (insn);
if (after_regscan)
if (copy_ok)
{
reg_scan_update (seq1, NEXT_INSN (last), old_max_reg);
old_max_reg = max_reg_num ();
}
emit_insns_before (seq1, temp5);
changed = 1;
continue;
/* Insert conditional move after insn, to be sure
that the jump and a possible compare won't be
separated. */
last = emit_insns_after (seq2, insn);
/* ??? We can also delete the insn that sets X to A.
Flow will do it too though. */
delete_insn (temp);
next = NEXT_INSN (insn);
delete_jump (insn);
if (after_regscan)
{
reg_scan_update (seq1, NEXT_INSN (last),
old_max_reg);
old_max_reg = max_reg_num ();
}
changed = 1;
continue;
}
}
else
end_sequence ();