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re PR middle-end/58145 (volatileness of write is discarded, perhaps in "lim1" related to loop optimizations)

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PR tree-optimization/58145
	* tree-sra.c (build_ref_for_offset): If prev_base has
	TREE_THIS_VOLATILE or TREE_SIDE_EFFECTS, propagate it to MEM_REF.

	* gcc.dg/pr58145-1.c: New test.
	* gcc.dg/pr58145-2.c: New test.

From-SVN: r201748
This commit is contained in:
Jakub Jelinek 2013-08-14 22:34:56 +02:00 committed by Jakub Jelinek
parent a7991d53a7
commit 4ca890e22e
5 changed files with 108 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,4 +1,11 @@
2013-08-14 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/58145
* tree-sra.c (build_ref_for_offset): If prev_base has
TREE_THIS_VOLATILE or TREE_SIDE_EFFECTS, propagate it to MEM_REF.
2013-08-14 Xinliang David Li <davidxl@google.com>
* config/i386/i386.c (ix86_option_override_internal):
Fix potential unitialized variable error.

6
gcc/testsuite/ChangeLog
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@ -1,3 +1,9 @@
2013-08-14 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/58145
* gcc.dg/pr58145-1.c: New test.
* gcc.dg/pr58145-2.c: New test.
2013-08-14 Joern Rennecke <joern.rennecke@embecosm.com>
* gcc.dg/debug/dwarf2/dwarf2.exp: Replace -gdwarf-2 with -gdwarf.

37
gcc/testsuite/gcc.dg/pr58145-1.c Normal file
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@ -0,0 +1,37 @@
/* PR tree-optimization/58145 */
/* { dg-do compile { target { int32plus } } } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
struct S { unsigned int data : 32; };
struct T { unsigned int data; };
volatile struct S s2;
void
f1 (int val)
{
struct S s = { .data = val };
*(volatile struct S *) 0x880000UL = s;
}
void
f2 (int val)
{
struct T t = { .data = val };
*(volatile struct T *) 0x880000UL = t;
}
void
f3 (int val)
{
*(volatile unsigned int *) 0x880000UL = val;
}
void
f4 (int val)
{
struct S s = { .data = val };
s2 = s;
}
/* { dg-final { scan-tree-dump-times " ={v} " 4 "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

51
gcc/testsuite/gcc.dg/pr58145-2.c Normal file
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@ -0,0 +1,51 @@
/* PR tree-optimization/58145 */
/* { dg-do compile { target { int32plus } } } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
struct S { unsigned int data : 32; };
struct T { unsigned int data; };
volatile struct S s2;
static inline void
f1 (int val)
{
struct S s = { .data = val };
*(volatile struct S *) 0x880000UL = s;
}
static inline void
f2 (int val)
{
struct T t = { .data = val };
*(volatile struct T *) 0x880000UL = t;
}
static inline void
f3 (int val)
{
*(volatile unsigned int *) 0x880000UL = val;
}
static inline void
f4 (int val)
{
struct S s = { .data = val };
s2 = s;
}
void
f5 (void)
{
int i;
for (i = 0; i < 100; i++)
f1 (0);
for (i = 0; i < 100; i++)
f2 (0);
for (i = 0; i < 100; i++)
f3 (0);
for (i = 0; i < 100; i++)
f4 (0);
}
/* { dg-final { scan-tree-dump-times " ={v} " 4 "optimized" } } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

8
gcc/tree-sra.c
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@ -1466,6 +1466,7 @@ build_ref_for_offset (location_t loc, tree base, HOST_WIDE_INT offset,
{
tree prev_base = base;
tree off;
tree mem_ref;
HOST_WIDE_INT base_offset;
unsigned HOST_WIDE_INT misalign;
unsigned int align;
@ -1516,7 +1517,12 @@ build_ref_for_offset (location_t loc, tree base, HOST_WIDE_INT offset,
if (align < TYPE_ALIGN (exp_type))
exp_type = build_aligned_type (exp_type, align);
return fold_build2_loc (loc, MEM_REF, exp_type, base, off);
mem_ref = fold_build2_loc (loc, MEM_REF, exp_type, base, off);
if (TREE_THIS_VOLATILE (prev_base))
TREE_THIS_VOLATILE (mem_ref) = 1;
if (TREE_SIDE_EFFECTS (prev_base))
TREE_SIDE_EFFECTS (mem_ref) = 1;
return mem_ref;
}
/* Construct a memory reference to a part of an aggregate BASE at the given