[gcc(refs/users/guojiufu/heads/personal-branch)] middle-end/95171 - inlining of trapping compare into non-call EH fn

[Jiu Fu Guo]

https://gcc.gnu.org/g:fe168751c5c1c517c7c89c9a1e4e561d66b24663

commit fe168751c5c1c517c7c89c9a1e4e561d66b24663
Author: Richard Biener <rguenther@suse.de>
Date:   Mon May 18 08:51:23 2020 +0200

    middle-end/95171 - inlining of trapping compare into non-call EH fn
    
    This fixes always-inlining across -fnon-call-exception boundaries
    for conditions which we do not allow to throw.
    
    2020-05-18  Richard Biener  <rguenther@suse.de>
    
            PR middle-end/95171
            * tree-inline.c (remap_gimple_stmt): Split out trapping compares
            when inlining into a non-call EH function.
    
            * gcc.dg/pr95171.c: New testcase.

Diff:
---
 gcc/ChangeLog                  |  6 ++++++
 gcc/testsuite/ChangeLog        |  5 +++++
 gcc/testsuite/gcc.dg/pr95171.c | 18 ++++++++++++++++++
 gcc/tree-inline.c              | 31 +++++++++++++++++++++++++++++++
 4 files changed, 60 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 491293d77df..98c035a5356 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2020-05-18  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/95171
+	* tree-inline.c (remap_gimple_stmt): Split out trapping compares
+	when inlining into a non-call EH function.
+
 2020-05-18  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/95172
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 1123599b9a7..33425f259b4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2020-05-18  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/95171
+	* gcc.dg/pr95171.c: New testcase.
+
 2020-05-18  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/95172
diff --git a/gcc/testsuite/gcc.dg/pr95171.c b/gcc/testsuite/gcc.dg/pr95171.c
new file mode 100644
index 00000000000..af9bde7bc6a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr95171.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-fexceptions -ffinite-math-only -fnon-call-exceptions" } */
+
+inline double __attribute__ ((always_inline))
+w9 (int q2)
+{
+  return __builtin_fabs (__builtin_nan ("")) > 0.0 ? 1.0 : q2 / 1.0;
+}
+
+double __attribute__ ((optimize ("-fipa-cp")))
+o7 (int iz)
+{
+  int rj[1];
+
+  (void) rj;
+
+  return w9 (iz);
+}
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index ee96c9cfff0..943f3f9407b 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -1956,6 +1956,37 @@ remap_gimple_stmt (gimple *stmt, copy_body_data *id)
       gimple_set_vuse (copy, NULL_TREE);
     }
 
+  if (cfun->can_throw_non_call_exceptions)
+    {
+      /* When inlining a function which does not have non-call exceptions
+	 enabled into a function that has (which only happens with
+	 always-inline) we have to fixup stmts that cannot throw.  */
+      if (gcond *cond = dyn_cast <gcond *> (copy))
+	if (gimple_could_trap_p (cond))
+	  {
+	    gassign *cmp
+	      = gimple_build_assign (make_ssa_name (boolean_type_node),
+				     gimple_cond_code (cond),
+				     gimple_cond_lhs (cond),
+				     gimple_cond_rhs (cond));
+	    gimple_seq_add_stmt (&stmts, cmp);
+	    gimple_cond_set_code (cond, NE_EXPR);
+	    gimple_cond_set_lhs (cond, gimple_assign_lhs (cmp));
+	    gimple_cond_set_rhs (cond, boolean_false_node);
+	  }
+      if (gassign *ass = dyn_cast <gassign *> (copy))
+	if ((gimple_assign_rhs_code (ass) == COND_EXPR
+	     || gimple_assign_rhs_code (ass) == VEC_COND_EXPR)
+	    && gimple_could_trap_p (ass))
+	  {
+	    gassign *cmp
+	      = gimple_build_assign (make_ssa_name (boolean_type_node),
+				     gimple_assign_rhs1 (ass));
+	    gimple_seq_add_stmt (&stmts, cmp);
+	    gimple_assign_set_rhs1 (ass, gimple_assign_lhs (cmp));
+	  }
+    }
+
   gimple_seq_add_stmt (&stmts, copy);
   return stmts;
 }