diff mbox series

tree-optimization/116785 - relax volatile handling in PTA

Message ID 20240927125058.2BF2F1386E@imap1.dmz-prg2.suse.org
State New
Headers show
Series tree-optimization/116785 - relax volatile handling in PTA | expand

Commit Message

Richard Biener Sept. 27, 2024, 12:50 p.m. UTC 
When there's volatile qualified stores we do not have to treat the
destination as pointing to ANYTHING.  It's only when reading from
it that we want to treat the resulting pointers as pointing to ANYTHING.

Bootstrapped and tested on x86_64-unknown-linux-gnu.

Richard.

	PR tree-optimization/116785
	* tree-ssa-structalias.cc (get_constraint_for_1): Only
	volatile qualified reads produce ANYTHING.
---
 gcc/tree-ssa-structalias.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/gcc/tree-ssa-structalias.cc b/gcc/tree-ssa-structalias.cc
index d6a53f801f0..54c4818998d 100644
--- a/gcc/tree-ssa-structalias.cc
+++ b/gcc/tree-ssa-structalias.cc
@@ -3646,7 +3646,7 @@  get_constraint_for_1 (tree t, vec<ce_s> *results, bool address_p,
       }
     case tcc_reference:
       {
-	if (TREE_THIS_VOLATILE (t))
+	if (!lhs_p && TREE_THIS_VOLATILE (t))
 	  /* Fall back to anything.  */
 	  break;
 
@@ -3751,7 +3751,7 @@  get_constraint_for_1 (tree t, vec<ce_s> *results, bool address_p,
       }
     case tcc_declaration:
       {
-	if (VAR_P (t) && TREE_THIS_VOLATILE (t))
+	if (!lhs_p && VAR_P (t) && TREE_THIS_VOLATILE (t))
 	  /* Fall back to anything.  */
 	  break;
 	get_constraint_for_ssa_var (t, results, address_p);