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re PR tree-optimization/61140 (wrong code at -O1 and above on x86_64-linux-gnu)

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2014-05-17  Marc Glisse  <marc.glisse@inria.fr>

	PR tree-optimization/61140
	PR tree-optimization/61150
	PR tree-optimization/61197
gcc/
	* tree-ssa-phiopt.c (value_replacement): Punt on multiple phis.
gcc/testsuite/
	* gcc.dg/tree-ssa/pr61140.c: New file.
	* gcc.dg/tree-ssa/pr61150.c: New file.
	* gcc.dg/tree-ssa/pr61197.c: New file.

From-SVN: r210554
This commit is contained in:
Marc Glisse 2014-05-17 14:37:58 +02:00 • committed by Marc Glisse
parent 6ca74b5cf0
commit 87a3444266
6 changed files with 88 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2014-05-17 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/61140
PR tree-optimization/61150
PR tree-optimization/61197
* tree-ssa-phiopt.c (value_replacement): Punt on multiple phis.
2014-05-17 Uros Bizjak <ubizjak@gmail.com>
* doc/invoke.texi (free): Mention Alpha. Also enabled at -Os.

9
gcc/testsuite/ChangeLog
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@ -1,3 +1,12 @@
2014-05-17 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/61140
PR tree-optimization/61150
PR tree-optimization/61197
* gcc.dg/tree-ssa/pr61140.c: New file.
* gcc.dg/tree-ssa/pr61150.c: New file.
* gcc.dg/tree-ssa/pr61197.c: New file.
2014-05-17 Uros Bizjak <ubizjak@gmail.com>
* g++.dg/pr60969.C: Compile for all ilp32 x86 targets.

18
gcc/testsuite/gcc.dg/tree-ssa/pr61140.c Normal file
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@ -0,0 +1,18 @@
/* { dg-do run } */
/* { dg-options "-O2" } */
int a[1] = { 1 }, b = 1, c;
int
main ()
{
for (; c < 1; c++)
if (a[0])
{
a[0] &= 1;
b = 0;
}
if (b)
__builtin_abort ();
return 0;
}

24
gcc/testsuite/gcc.dg/tree-ssa/pr61150.c Normal file
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@ -0,0 +1,24 @@
/* { dg-do run } */
/* { dg-options "-O3" } */
int a, b, c, d = 1;
int
main ()
{
int e = d;
for (b = 0; b < 5; b++)
{
for (a = 0; a < 1; a++)
{
if (e)
break;
for (c = 0; c < 1; c++)
;
}
e |= 1;
}
if (c)
__builtin_abort();
return 0;
}

26
gcc/testsuite/gcc.dg/tree-ssa/pr61197.c Normal file
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@ -0,0 +1,26 @@
/* { dg-do run } */
/* { dg-options "-O3" } */
int a, b = 1, *c = &a;
int
foo ()
{
if (b)
b |= 1;
else
{
b = 1;
return 0;
}
return 1;
}
int
main ()
{
*c = foo ();
if (a != 1)
__builtin_abort ();
return 0;
}

4
gcc/tree-ssa-phiopt.c
View file

@ -849,6 +849,10 @@ value_replacement (basic_block cond_bb, basic_block middle_bb,
&& !POINTER_TYPE_P (TREE_TYPE (arg0))))
return 0;
/* Only transform if it removes the condition. */
if (!single_non_singleton_phi_for_edges (phi_nodes (gimple_bb (phi)), e0, e1))
return 0;
/* Size-wise, this is always profitable. */
if (optimize_bb_for_speed_p (cond_bb)
/* The special case is useless if it has a low probability. */