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re PR tree-optimization/70288 (ICE with -O1 -fno-tree-dominator-opts)

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2016-03-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70288
	* tree-ssa-loop-ivcanon.c (tree_estimate_loop_size): Make sure
	we do not estimate unsimplified all-constant conditionals or
	switches as optimized away.

	* gcc.dg/torture/pr70288-1.c: New testcase.
	* gcc.dg/torture/pr70288-2.c: Likewise.

From-SVN: r234361
This commit is contained in:
Richard Biener 2016-03-21 09:11:37 +00:00 committed by Richard Biener
parent 3eee49ed0d
commit 56bbfaf62c
5 changed files with 92 additions and 2 deletions

7
gcc/ChangeLog

@ -1,3 +1,10 @@
2016-03-21 Richard Biener <rguenther@suse.de>
PR tree-optimization/70288
* tree-ssa-loop-ivcanon.c (tree_estimate_loop_size): Make sure
we do not estimate unsimplified all-constant conditionals or
switches as optimized away.
2016-03-21 Andrey Belevantsev <abel@ispras.ru>
PR rtl-optimization/69102

6
gcc/testsuite/ChangeLog

@ -1,3 +1,9 @@
2016-03-21 Richard Biener <rguenther@suse.de>
PR tree-optimization/70288
* gcc.dg/torture/pr70288-1.c: New testcase.
* gcc.dg/torture/pr70288-2.c: Likewise.
2016-03-21 Andrey Belevantsev <abel@ispras.ru>
PR rtl-optimization/69307

36
gcc/testsuite/gcc.dg/torture/pr70288-1.c Normal file

@ -0,0 +1,36 @@
/* { dg-do compile } */
/* { dg-require-effective-target int32plus } */
int main()
{
int var6 = -1267827473;
do {
++var6;
double s1_115[4], s2_108[4];
int var8 = -161498264;
do {
++var8;
int var12 = 1260960076;
for (; var12 <= 1260960080; ++var12) {
int var13 = 1960990937;
do {
++var13;
int var14 = 2128638723;
for (; var14 <= 2128638728; ++var14) {
int var22 = -1141190839;
do {
++var22;
if (s2_108 > s1_115) {
int var23 = -890798748;
do {
++var23;
long long e_119[4];
} while (var23 <= -890798746);
}
} while (var22 <= -1141190829);
}
} while (var13 <= 1960990946);
}
} while (var8 <= -161498254);
} while (var6 <= -1267827462);
}

35
gcc/testsuite/gcc.dg/torture/pr70288-2.c Normal file

@ -0,0 +1,35 @@
/* { dg-do compile } */
/* { dg-require-effective-target int32plus } */
int main()
{
int var6 = -1267827473;
do {
++var6;
double s1_115[4], s2_108[4];
int var8 = -161498264;
do {
++var8;
int var12 = 1260960076;
for (; var12 <= 1260960080; ++var12) {
int var13 = 1960990937;
do {
++var13;
int var14 = 2128638723;
for (; var14 <= 2128638728; ++var14) {
int var22 = -1141190839;
do {
++var22;
if (s2_108 > s1_115) {
int var23 = -890798748;
do {
long long e_119[4];
} while (var23 <= -890798746);
}
} while (var22 <= -1141190829);
}
} while (var13 <= 1960990946);
}
} while (var8 <= -161498254);
} while (var6 <= -1267827462);
}

10
gcc/tree-ssa-loop-ivcanon.c

@ -298,11 +298,17 @@ tree_estimate_loop_size (struct loop *loop, edge exit, edge edge_to_cancel, stru
/* Conditionals. */
else if ((gimple_code (stmt) == GIMPLE_COND
&& constant_after_peeling (gimple_cond_lhs (stmt), stmt, loop)
&& constant_after_peeling (gimple_cond_rhs (stmt), stmt, loop))
&& constant_after_peeling (gimple_cond_rhs (stmt), stmt, loop)
/* We don't simplify all constant compares so make sure
they are not both constant already. See PR70288. */
&& (! is_gimple_min_invariant (gimple_cond_lhs (stmt))
|| ! is_gimple_min_invariant (gimple_cond_rhs (stmt))))
|| (gimple_code (stmt) == GIMPLE_SWITCH
&& constant_after_peeling (gimple_switch_index (
as_a <gswitch *> (stmt)),
stmt, loop)))
stmt, loop)
&& ! is_gimple_min_invariant (gimple_switch_index (
as_a <gswitch *> (stmt)))))
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, " Constant conditional.\n");