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re PR tree-optimization/52324 (Store motion no longer performed) 

2012-02-21  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/52324
	* gimplify.c (gimplify_expr): When re-gimplifying expressions
	do not gimplify a MEM_REF address operand if it is already
	in suitable form.

	* gcc.dg/tree-ssa/ssa-lim-10.c: New testcase.

From-SVN: r184435
This commit is contained in:
Richard Guenther 2012-02-21 12:37:33 +00:00 committed by Richard Biener
parent 305406d3e1
commit 01718e96e7
4 changed files with 56 additions and 5 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2012-02-21 Richard Guenther <rguenther@suse.de>
PR tree-optimization/52324
* gimplify.c (gimplify_expr): When re-gimplifying expressions
do not gimplify a MEM_REF address operand if it is already
in suitable form.
2012-02-21 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
* config/s390/s390.md ("fixuns_trunc<mode>si2"): Replace

18
gcc/gimplify.c
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@ -7061,15 +7061,23 @@ gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
ret = GS_OK;
break;
}
ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
is_gimple_mem_ref_addr, fb_rvalue);
if (ret == GS_ERROR)
break;
/* Avoid re-gimplifying the address operand if it is already
in suitable form. Re-gimplifying would mark the address
operand addressable. Always gimplify when not in SSA form
as we still may have to gimplify decls with value-exprs. */
if (!gimplify_ctxp || !gimplify_ctxp->into_ssa
|| !is_gimple_mem_ref_addr (TREE_OPERAND (*expr_p, 0)))
{
ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
is_gimple_mem_ref_addr, fb_rvalue);
if (ret == GS_ERROR)
break;
}
recalculate_side_effects (*expr_p);
ret = GS_ALL_DONE;
break;
/* Constants need not be gimplified. */
/* Constants need not be gimplified. */
case INTEGER_CST:
case REAL_CST:
case FIXED_CST:

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2012-02-21 Richard Guenther <rguenther@suse.de>
PR tree-optimization/52324
* gcc.dg/tree-ssa/ssa-lim-10.c: New testcase.
2012-02-21 Georg-Johann Lay <avr@gjlay.de>
PR middle-end/51782

31
gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-10.c Normal file
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@ -0,0 +1,31 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-lim1-details" } */
int *l, *r;
int test_func(void)
{
int i;
int direction;
static int pos;
pos = 0;
direction = 1;
for ( i = 0; i <= 400; i++ )
{
if ( direction == 0 )
pos = l[pos];
else
pos = r[pos];
if ( pos == -1 )
{
pos = 0;
direction = !direction;
}
}
return i;
}
/* { dg-final { scan-tree-dump "Executing store motion of pos" "lim1" } } */
/* { dg-final { cleanup-tree-dump "lim1" } } */