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re PR middle-end/83945 (internal compiler error: Segmentation fault with -O -fcode-hoisting) 

PR middle-end/83945
	* tree-emutls.c: Include gimplify.h.
	(lower_emutls_2): New function.
	(lower_emutls_1): If ADDR_EXPR is a gimple invariant and walk_tree
	with lower_emutls_2 callback finds some TLS decl in it, unshare_expr
	it before further processing.

	* gcc.dg/tls/pr83945.c: New test.

From-SVN: r256916
This commit is contained in:
Jakub Jelinek 2018-01-20 10:58:31 +01:00 committed by Jakub Jelinek
parent 09cbbded0d
commit 37b7e7873d
4 changed files with 53 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,5 +1,12 @@
2018-01-20 Jakub Jelinek <jakub@redhat.com>
PR middle-end/83945
* tree-emutls.c: Include gimplify.h.
(lower_emutls_2): New function.
(lower_emutls_1): If ADDR_EXPR is a gimple invariant and walk_tree
with lower_emutls_2 callback finds some TLS decl in it, unshare_expr
it before further processing.
PR target/83930
* simplify-rtx.c (simplify_binary_operation_1) <case UMOD>: Use
UINTVAL (trueop1) instead of INTVAL (op1).

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2018-01-20 Jakub Jelinek <jakub@redhat.com>
PR middle-end/83945
* gcc.dg/tls/pr83945.c: New test.
PR target/83930
* gcc.dg/pr83930.c: New test.

21
gcc/testsuite/gcc.dg/tls/pr83945.c Normal file
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@ -0,0 +1,21 @@
/* PR middle-end/83945 */
/* { dg-do compile { target tls } } */
/* { dg-options "-O2" } */
struct S { int a[1]; };
__thread struct T { int c; } e;
int f;
void bar (int);
void
foo (int f, int x)
{
struct S *h = (struct S *) &e.c;
for (;;)
{
int *a = h->a, i;
for (i = x; i; i--)
bar (a[f]);
bar (a[f]);
}
}

22
gcc/tree-emutls.c
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@ -34,6 +34,7 @@ along with GCC; see the file COPYING3. If not see
#include "gimple-walk.h"
#include "langhooks.h"
#include "tree-iterator.h"
#include "gimplify.h"
/* Whenever a target does not support thread-local storage (TLS) natively,
we can emulate it with some run-time support in libgcc. This will in
@ -429,6 +430,20 @@ gen_emutls_addr (tree decl, struct lower_emutls_data *d)
return addr;
}
/* Callback for lower_emutls_1, return non-NULL if there is any TLS
VAR_DECL in the subexpressions. */
static tree
lower_emutls_2 (tree *ptr, int *walk_subtrees, void *)
{
tree t = *ptr;
if (TREE_CODE (t) == VAR_DECL)
return DECL_THREAD_LOCAL_P (t) ? t : NULL_TREE;
else if (!EXPR_P (t))
*walk_subtrees = 0;
return NULL_TREE;
}
/* Callback for walk_gimple_op. D = WI->INFO is a struct lower_emutls_data.
Given an operand *PTR within D->STMT, if the operand references a TLS
variable, then lower the reference to a call to the runtime. Insert
@ -455,6 +470,13 @@ lower_emutls_1 (tree *ptr, int *walk_subtrees, void *cb_data)
{
bool save_changed;
/* Gimple invariants are shareable trees, so before changing
anything in them if we will need to change anything, unshare
them. */
if (is_gimple_min_invariant (t)
&& walk_tree (&TREE_OPERAND (t, 0), lower_emutls_2, NULL, NULL))
*ptr = t = unshare_expr (t);
/* If we're allowed more than just is_gimple_val, continue. */
if (!wi->val_only)
{