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re PR tree-optimization/69606 (wrong code at -Os and above on x86_64-linux-gnu)

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2016-02-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/69606
	* tree-ssa-math-opts.c (bswap_replace): Clear flow sensitive
	info on the result before moving a stmt.

	* gcc.dg/torture/pr69606.c: New testcase.

From-SVN: r233069
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Richard Biener 2016-02-02 12:39:36 +00:00 committed by Richard Biener
parent 2d4dc2233b
commit 9dc03c974f
4 changed files with 33 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-02-02 Richard Biener <rguenther@suse.de>
PR tree-optimization/69606
* tree-ssa-math-opts.c (bswap_replace): Clear flow sensitive
info on the result before moving a stmt.
2016-02-02 Yuri Rumyantsev <ysrumyan@gmail.com>
PR middle-end/68542

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-02-02 Richard Biener <rguenther@suse.de>
PR tree-optimization/69606
* gcc.dg/torture/pr69606.c: New testcase.
2016-02-02 Yuri Rumyantsev <ysrumyan@gmail.com>
PR middle-end/68542

20
gcc/testsuite/gcc.dg/torture/pr69606.c Normal file
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@ -0,0 +1,20 @@
/* { dg-do run } */
char a;
unsigned short b;
int c, d;
unsigned char e;
int
main ()
{
int f = 1, g = ~a;
if (b > f)
{
e = b;
d = b | e;
g = 0;
}
c = 1 % g;
return 0;
}

2
gcc/tree-ssa-math-opts.c
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@ -2622,6 +2622,8 @@ bswap_replace (gimple *cur_stmt, gimple *src_stmt, tree fndecl,
/* Move cur_stmt just before one of the load of the original
to ensure it has the same VUSE. See PR61517 for what could
go wrong. */
if (gimple_bb (cur_stmt) != gimple_bb (src_stmt))
reset_flow_sensitive_info (gimple_assign_lhs (cur_stmt));
gsi_move_before (&gsi, &gsi_ins);
gsi = gsi_for_stmt (cur_stmt);