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* dojump.c (do_jump_by_parts_greater_rtx): Optimize in specific cases.

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From-SVN: r171425
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Eric Botcazou 2011-03-24 21:56:38 +00:00 committed by Eric Botcazou
parent 2717305800
commit c867956724
2 changed files with 34 additions and 8 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2011-03-24 Eric Botcazou <ebotcazou@adacore.com>
* dojump.c (do_jump_by_parts_greater_rtx): Optimize in specific cases.
2011-03-24 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.md (ix86_print_operand): Output DFmode const_double

38
gcc/dojump.c
View File

@ -637,14 +637,33 @@ do_jump_by_parts_greater_rtx (enum machine_mode mode, int unsignedp, rtx op0,
{
int nwords = (GET_MODE_SIZE (mode) / UNITS_PER_WORD);
rtx drop_through_label = 0;
bool drop_through_if_true = false, drop_through_if_false = false;
enum rtx_code code = GT;
int i;
if (! if_true_label || ! if_false_label)
drop_through_label = gen_label_rtx ();
if (! if_true_label)
if_true_label = drop_through_label;
{
if_true_label = drop_through_label;
drop_through_if_true = true;
}
if (! if_false_label)
if_false_label = drop_through_label;
{
if_false_label = drop_through_label;
drop_through_if_false = true;
}
/* Deal with the special case 0 > x: only one comparison is necessary and
we reverse it to avoid jumping to the drop-through label. */
if (op0 == const0_rtx && drop_through_if_true && !drop_through_if_false)
{
code = LE;
if_true_label = if_false_label;
if_false_label = drop_through_label;
drop_through_if_true = false;
drop_through_if_false = true;
}
/* Compare a word at a time, high order first. */
for (i = 0; i < nwords; i++)
@ -663,17 +682,20 @@ do_jump_by_parts_greater_rtx (enum machine_mode mode, int unsignedp, rtx op0,
}
/* All but high-order word must be compared as unsigned. */
do_compare_rtx_and_jump (op0_word, op1_word, GT,
(unsignedp || i > 0), word_mode, NULL_RTX,
NULL_RTX, if_true_label, prob);
do_compare_rtx_and_jump (op0_word, op1_word, code, (unsignedp || i > 0),
word_mode, NULL_RTX, NULL_RTX, if_true_label,
prob);
/* Emit only one comparison for 0. Do not emit the last cond jump. */
if (op0 == const0_rtx || i == nwords - 1)
break;
/* Consider lower words only if these are equal. */
do_compare_rtx_and_jump (op0_word, op1_word, NE, unsignedp, word_mode,
NULL_RTX, NULL_RTX, if_false_label,
inv (prob));
NULL_RTX, NULL_RTX, if_false_label, inv (prob));
}
if (if_false_label)
if (!drop_through_if_false)
emit_jump (if_false_label);
if (drop_through_label)
emit_label (drop_through_label);