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re PR tree-optimization/28887 (rejects valid code (bitfields and loops) with -O1 -fprefetch-loop-arrays)

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2006-09-17  Zdenek Dvorak <dvorakz@suse.cz>

	PR tree-optimization/28887
	* tree-ssa-loop-prefetch.c (analyze_ref): Strip nonaddressable
	component parts from the reference.
	(gather_memory_references_ref): Record the reference without the
	nonaddressable component parts.

	* gcc.dg/prefetch-loop-arrays-1.c: New test case.

From-SVN: r117012
This commit is contained in:
Roger Sayle 2006-09-18 01:54:33 +00:00
parent 8e77de24de
commit aac8b8ed8a
4 changed files with 57 additions and 4 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2006-09-17 Zdenek Dvorak <dvorakz@suse.cz>
PR tree-optimization/28887
* tree-ssa-loop-prefetch.c (analyze_ref): Strip nonaddressable
component parts from the reference.
(gather_memory_references_ref): Record the reference without the
nonaddressable component parts.
2006-09-17 Steven Bosscher <steven@gcc.gnu.org>
PR c/25993

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2006-09-17 Roger Sayle <roger@eyesopen.com>
PR tree-optimization/28887
* gcc.dg/prefetch-loop-arrays-1.c: New test case.
2006-09-16 Steven Bosscher <steven@gcc.gnu.org>
PR c/25993

36
gcc/testsuite/gcc.dg/prefetch-loop-arrays-1.c Normal file
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@ -0,0 +1,36 @@
/* PR tree-optimization/28887 */
/* { dg-do compile } */
/* { dg-options "-O2 -fprefetch-loop-arrays -w" } */
/* { dg-options "-O2 -fprefetch-loop-arrays -march=i686 -msse -w" { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
typedef unsigned long size_t;
struct re_pattern_buffer
{
size_t re_nsub;
};
typedef enum
{
start_memory,
} re_opcode_t;
typedef union
{
struct
{
unsigned matched_something:1;
} bits;
} byte_register_info_type;
void byte_re_match_2_internal (struct re_pattern_buffer *bufp)
{
int mcnt;
size_t num_regs = bufp->re_nsub + 1;
byte_register_info_type *reg_info;
for (mcnt = 1; (unsigned) mcnt < num_regs; mcnt++)
{
((reg_info[mcnt]).bits.matched_something) = 0;
}
}

12
gcc/tree-ssa-loop-prefetch.c
View File

@ -387,18 +387,20 @@ idx_analyze_ref (tree base, tree *index, void *data)
return true;
}
/* Tries to express REF in shape &BASE + STEP * iter + DELTA, where DELTA and
/* Tries to express REF_P in shape &BASE + STEP * iter + DELTA, where DELTA and
STEP are integer constants and iter is number of iterations of LOOP. The
reference occurs in statement STMT. */
reference occurs in statement STMT. Strips nonaddressable component
references from REF_P. */
static bool
analyze_ref (struct loop *loop, tree ref, tree *base,
analyze_ref (struct loop *loop, tree *ref_p, tree *base,
HOST_WIDE_INT *step, HOST_WIDE_INT *delta,
tree stmt)
{
struct ar_data ar_data;
tree off;
HOST_WIDE_INT bit_offset;
tree ref = *ref_p;
*step = 0;
*delta = 0;
@ -408,6 +410,8 @@ analyze_ref (struct loop *loop, tree ref, tree *base,
&& DECL_NONADDRESSABLE_P (TREE_OPERAND (ref, 1)))
ref = TREE_OPERAND (ref, 0);
*ref_p = ref;
for (; TREE_CODE (ref) == COMPONENT_REF; ref = TREE_OPERAND (ref, 0))
{
off = DECL_FIELD_BIT_OFFSET (TREE_OPERAND (ref, 1));
@ -436,7 +440,7 @@ gather_memory_references_ref (struct loop *loop, struct mem_ref_group **refs,
HOST_WIDE_INT step, delta;
struct mem_ref_group *agrp;
if (!analyze_ref (loop, ref, &base, &step, &delta, stmt))
if (!analyze_ref (loop, &ref, &base, &step, &delta, stmt))
return;
/* Now we know that REF = &BASE + STEP * iter + DELTA, where DELTA and STEP