OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

re PR tree-optimization/21171 (IV OPTS removes does not create a new VOPs for constant values)

Browse Source 
PR tree-optimization/21171
	* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Do not
	record address uses if the reference is volatile.

	* gcc.dg/tree-ssa/pr21171.c: New test.

From-SVN: r98828
This commit is contained in:
Zdenek Dvorak 2005-04-27 16:28:11 +02:00 committed by Zdenek Dvorak
parent c4336539b9
commit e3cc72542b
4 changed files with 45 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2005-04-27 Zdenek Dvorak <dvorakz@suse.cz>
PR tree-optimization/21171
* tree-ssa-loop-ivopts.c (find_interesting_uses_address): Do not
record address uses if the reference is volatile.
2004-04-27 Paolo Bonzini <bonzini@gnu.org>
* tree-complex.c (expand_vector_operation): New, extracted from

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2005-04-27 Zdenek Dvorak <dvorakz@suse.cz>
PR tree-optimization/21171
* gcc.dg/tree-ssa/pr21171.c: New test.
2004-04-27 Paolo Bonzini <bonzini@gnu.org>
* gcc.dg/tree-ssa/gen-vect-11.c, gcc.dg/tree-ssa/gen-vect-11a.c,

29
gcc/testsuite/gcc.dg/tree-ssa/pr21171.c Normal file
View File

@ -0,0 +1,29 @@
/* PR 21171. Ivopts should not rewrite references to volatile memory. */
/* { dg-do compile } */
/* { dg-options "-O1 -fdump-tree-vars" } */
typedef unsigned int u_int32_t;
typedef unsigned char u_int8_t;
#define AIC_VECTORS 32
typedef volatile struct AT91RM9200_regs {
u_int32_t SVR[AIC_VECTORS];
} AT91RM9200_regs_t;
#define CPUReg ((AT91RM9200_regs_t*)0xFFF00000)
extern const u_int32_t __IntTable[AIC_VECTORS];
int main()
{
int c;
for (c = 0; c < AIC_VECTORS; c++)
CPUReg->SVR[c] = __IntTable[c];
return 0;
}
/* { dg-final { scan-tree-dump-times "SVR" 1 "vars"} } */
/* { dg-final { cleanup-tree-dump "vars" } } */

5
gcc/tree-ssa-loop-ivopts.c
View File

@ -1518,6 +1518,11 @@ find_interesting_uses_address (struct ivopts_data *data, tree stmt, tree *op_p)
struct iv *civ;
struct ifs_ivopts_data ifs_ivopts_data;
/* Do not play with volatile memory references. A bit too conservative,
perhaps, but safe. */
if (stmt_ann (stmt)->has_volatile_ops)
goto fail;
/* Ignore bitfields for now. Not really something terribly complicated
to handle. TODO. */
if (TREE_CODE (base) == COMPONENT_REF