From fbcbbfe2bf83eb8b1347144eeca37b06be5a8bb5 Mon Sep 17 00:00:00 2001
From: Richard Biener <rguenther@suse.de>
Date: Mon, 3 Feb 2025 09:55:50 +0100
Subject: tree-optimization/118717 - store commoning vs. abnormals

When we sink common stores in cselim or the sink pass we have to
make sure to not introduce overlapping lifetimes for abnormals
used in the ref.  The easiest is to avoid sinking stmts which
reference abnormals at all which is what the following does.

	PR tree-optimization/118717
	* tree-ssa-phiopt.cc (cond_if_else_store_replacement_1):
	Do not common stores referencing abnormal SSA names.
	* tree-ssa-sink.cc (sink_common_stores_to_bb): Likewise.

	* gcc.dg/torture/pr118717.c: New testcase.
---
 gcc/testsuite/gcc.dg/torture/pr118717.c | 41 +++++++++++++++++++++++++++++++++
 gcc/tree-ssa-phiopt.cc                  |  4 +++-
 gcc/tree-ssa-sink.cc                    |  4 +++-
 3 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/torture/pr118717.c

(limited to 'gcc')

diff --git a/gcc/testsuite/gcc.dg/torture/pr118717.c b/gcc/testsuite/gcc.dg/torture/pr118717.c
new file mode 100644
index 0000000..42dc5ec
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr118717.c
@@ -0,0 +1,41 @@
+/* { dg-do compile } */
+
+void jj(void);
+int ff1(void) __attribute__((__returns_twice__));
+struct s2 {
+  int prev;
+};
+typedef struct s1 {
+  unsigned interrupt_flag;
+  unsigned interrupt_mask;
+  int tag;
+  int state;
+}s1;
+int ff(void);
+static inline
+int mm(s1 *ec) {
+  if (ff())
+    if (ec->interrupt_flag & ~(ec)->interrupt_mask)
+      return 0;
+}
+void ll(s1 *ec) {
+  int t = 1;
+  int state;
+  if (t)
+  {
+    {
+      s1 *const _ec = ec;
+      struct s2 _tag = {0};
+      if (ff1())
+	state = ec->state;
+      else
+	state = 0;
+      if (!state)
+	mm (ec);
+      _ec->tag = _tag.prev;
+    }
+    if (state)
+      __builtin_exit(0);
+  }
+  jj();
+}
diff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc
index 64d3ba9..f67f52d 100644
--- a/gcc/tree-ssa-phiopt.cc
+++ b/gcc/tree-ssa-phiopt.cc
@@ -3646,7 +3646,9 @@ cond_if_else_store_replacement_1 (basic_block then_bb, basic_block else_bb,
       || else_assign == NULL
       || !gimple_assign_single_p (else_assign)
       || gimple_clobber_p (else_assign)
-      || gimple_has_volatile_ops (else_assign))
+      || gimple_has_volatile_ops (else_assign)
+      || stmt_references_abnormal_ssa_name (then_assign)
+      || stmt_references_abnormal_ssa_name (else_assign))
     return false;
 
   lhs = gimple_assign_lhs (then_assign);
diff --git a/gcc/tree-ssa-sink.cc b/gcc/tree-ssa-sink.cc
index e79762b..959e0d5 100644
--- a/gcc/tree-ssa-sink.cc
+++ b/gcc/tree-ssa-sink.cc
@@ -36,6 +36,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "cfgloop.h"
 #include "tree-eh.h"
 #include "tree-ssa-live.h"
+#include "tree-dfa.h"
 
 /* TODO:
    1. Sinking store only using scalar promotion (IE without moving the RHS):
@@ -516,7 +517,8 @@ sink_common_stores_to_bb (basic_block bb)
 	      gimple *def = SSA_NAME_DEF_STMT (arg);
 	      if (! is_gimple_assign (def)
 		  || stmt_can_throw_internal (cfun, def)
-		  || (gimple_phi_arg_edge (phi, i)->flags & EDGE_ABNORMAL))
+		  || (gimple_phi_arg_edge (phi, i)->flags & EDGE_ABNORMAL)
+		  || stmt_references_abnormal_ssa_name (def))
 		{
 		  /* ???  We could handle some cascading with the def being
 		     another PHI.  We'd have to insert multiple PHIs for
-- 
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