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sel-sched: fixup reset of first_insn (PR 85876)

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2019-04-02  Andrey Belevantsev  <abel@ispras.ru>

	PR rtl-optimization/85876
	* sel-sched.c (code_motion_path_driver): Avoid unwinding first_insn
	beyond the original fence.

	* gcc.dg/pr85876.c: New test.

From-SVN: r270095
This commit is contained in:
Andrey Belevantsev 2019-04-02 18:39:22 +03:00 committed by Alexander Monakov
parent 43f47cdf13
commit 7dc69ec076
4 changed files with 33 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-04-02 Andrey Belevantsev <abel@ispras.ru>
PR rtl-optimization/85876
* sel-sched.c (code_motion_path_driver): Avoid unwinding first_insn
beyond the original fence.
2019-04-02 Ulrich Weigand <uweigand@de.ibm.com>
* config.gcc: Mark spu* targets as deprecated/obsolete.

6
gcc/sel-sched.c
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@ -6439,7 +6439,7 @@ code_motion_path_driver (insn_t insn, av_set_t orig_ops, ilist_t path,
{
expr_t expr = NULL;
basic_block bb = BLOCK_FOR_INSN (insn);
insn_t first_insn, bb_tail, before_first;
insn_t first_insn, original_insn, bb_tail, before_first;
bool removed_last_insn = false;
if (sched_verbose >= 6)
@ -6523,7 +6523,7 @@ code_motion_path_driver (insn_t insn, av_set_t orig_ops, ilist_t path,
/* It is enough to place only heads and tails of visited basic blocks into
the PATH. */
ilist_add (&path, insn);
first_insn = insn;
first_insn = original_insn = insn;
bb_tail = sel_bb_end (bb);
/* Descend the basic block in search of the original expr; this part
@ -6630,6 +6630,8 @@ code_motion_path_driver (insn_t insn, av_set_t orig_ops, ilist_t path,
{
insn = sel_bb_end (bb);
first_insn = sel_bb_head (bb);
if (first_insn != original_insn)
first_insn = original_insn;
}
/* Remove bb tail from path. */

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-04-02 Andrey Belevantsev <abel@ispras.ru>
PR rtl-optimization/85876
* gcc.dg/pr85876.c: New test.
2019-04-02 Andreas Krebbel <krebbel@linux.ibm.com>
* gcc.target/s390/zvector/vec-double-compile.c: New test.

18
gcc/testsuite/gcc.dg/pr85876.c Normal file
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@ -0,0 +1,18 @@
/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
/* { dg-options "-O2 -fschedule-insns -fsel-sched-pipelining -fselective-scheduling -fno-if-conversion -fno-tree-dce" } */
/* { dg-additional-options "-march=bdver1" { target i?86-*-* x86_64-*-* } } */
int ov, rq, ac;
int
y2 (int);
void
f8 (int vn)
{
while (rq < 1)
{
ov *= y2 (ac);
vn += (!!ov && !!ac) + ac;
}
}