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re PR rtl-optimization/37451 (Extra addition for doloop in some cases)

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2008-09-18  Andrew Pinski  <andrew_pinski@playstation.sony.com>

        PR rtl-opt/37451
        * loop-doloop.c (doloop_modify): New argument zero_extend_p and
        zero extend count after the correction to it is done.
        (doloop_optimize): Update call to doloop_modify, don't zero extend
        count before call.

From-SVN: r140470
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Andrew Pinski 2008-09-18 19:28:48 +00:00 committed by Andrew Pinski
parent c78a2119d8
commit b2a38b1d6e
2 changed files with 19 additions and 5 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2008-09-18 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR rtl-opt/37451
* loop-doloop.c (doloop_modify): New argument zero_extend_p and
zero extend count after the correction to it is done.
(doloop_optimize): Update call to doloop_modify, don't zero extend
count before call.
2008-09-18 Martin Jambor <mjambor@suse.cz>
* ipa-cp.c (ipcp_estimate_growth): Return 0 instead of false.

16
gcc/loop-doloop.c
View File

@ -333,11 +333,13 @@ add_test (rtx cond, edge *e, basic_block dest)
describes the loop, DESC describes the number of iterations of the
loop, and DOLOOP_INSN is the low-overhead looping insn to emit at the
end of the loop. CONDITION is the condition separated from the
DOLOOP_SEQ. COUNT is the number of iterations of the LOOP. */
DOLOOP_SEQ. COUNT is the number of iterations of the LOOP.
ZERO_EXTEND_P says to zero extend COUNT after the increment of it to
word_mode. */
static void
doloop_modify (struct loop *loop, struct niter_desc *desc,
rtx doloop_seq, rtx condition, rtx count)
rtx doloop_seq, rtx condition, rtx count, bool zero_extend_p)
{
rtx counter_reg;
rtx tmp, noloop = NULL_RTX;
@ -413,6 +415,10 @@ doloop_modify (struct loop *loop, struct niter_desc *desc,
if (increment_count)
count = simplify_gen_binary (PLUS, mode, count, const1_rtx);
if (zero_extend_p)
count = simplify_gen_unary (ZERO_EXTEND, word_mode,
count, mode);
/* Insert initialization of the count register into the loop header. */
start_sequence ();
tmp = force_operand (count, counter_reg);
@ -547,6 +553,7 @@ doloop_optimize (struct loop *loop)
struct niter_desc *desc;
unsigned word_mode_size;
unsigned HOST_WIDE_INT word_mode_max;
bool zero_extend_p = false;
if (dump_file)
fprintf (dump_file, "Doloop: Processing loop %d.\n", loop->num);
@ -621,8 +628,7 @@ doloop_optimize (struct loop *loop)
{
if (word_mode_size > GET_MODE_BITSIZE (mode))
{
count = simplify_gen_unary (ZERO_EXTEND, word_mode,
count, mode);
zero_extend_p = true;
iterations = simplify_gen_unary (ZERO_EXTEND, word_mode,
iterations, mode);
iterations_max = simplify_gen_unary (ZERO_EXTEND, word_mode,
@ -666,7 +672,7 @@ doloop_optimize (struct loop *loop)
return false;
}
doloop_modify (loop, desc, doloop_seq, condition, count);
doloop_modify (loop, desc, doloop_seq, condition, count, zero_extend_p);
return true;
}