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re PR tree-optimization/63962 ([x86] Code pessimization after r217213)

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2014-11-20  Richard Biener  <rguenther@suse.de>

	PR middle-end/63962
	* match.pd ((p +p off1) +p off2 -> (p +p (off1 + off2))):
	Guard with single-use operand 0.

	* gcc.dg/tree-ssa/forwprop-30.c: New testcase.

From-SVN: r217828
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Richard Biener 2014-11-20 09:26:48 +00:00 committed by Richard Biener
parent b00734dfd6
commit e6121733d5
4 changed files with 29 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-11-20 Richard Biener <rguenther@suse.de>
PR middle-end/63962
* match.pd ((p +p off1) +p off2 -> (p +p (off1 + off2))):
Guard with single-use operand 0.
2014-11-20 Richard Biener <rguenther@suse.de>
PR tree-optimization/63677

5
gcc/match.pd
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@ -370,8 +370,9 @@ along with GCC; see the file COPYING3. If not see
/* Associate (p +p off1) +p off2 as (p +p (off1 + off2)). */
(simplify
(pointer_plus (pointer_plus @0 @1) @3)
(pointer_plus @0 (plus @1 @3)))
(pointer_plus (pointer_plus@2 @0 @1) @3)
(if (TREE_CODE (@2) != SSA_NAME || has_single_use (@2))
(pointer_plus @0 (plus @1 @3))))
/* Pattern match
tem1 = (long) ptr1;

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2014-11-20 Richard Biener <rguenther@suse.de>
PR middle-end/63962
* gcc.dg/tree-ssa/forwprop-30.c: New testcase.
2014-11-20 Richard Biener <rguenther@suse.de>
PR tree-optimization/63677

15
gcc/testsuite/gcc.dg/tree-ssa/forwprop-30.c Normal file
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@ -0,0 +1,15 @@
/* { dg-do compile } */
/* { dg-options "-O -fdump-tree-optimized" } */
int *p;
int *foo (int *q, int i, int j)
{
p = q + i;
return p + j;
}
/* We shouldn't associate (q + i) + j to q + (i + j) here as we
need q + i as well. */
/* { dg-final { scan-tree-dump-times "\\+" 2 "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */