PR84300, ICE in dwarf2cfi on ppc64le with -fsplit-stack -fno-omit-frame-pointer

	PR target/84300
gcc/
	* config/rs6000/rs6000.md (split_stack_return): Remove (use ..).
	Specify LR as an input.
gcc/testsuite/
	* gcc.dg/pr84300.c: New.

From-SVN: r257549

gcc/ChangeLog

+2018-02-10  Alan Modra  <amodra@gmail.com>
+
+	PR target/84300
+	* config/rs6000/rs6000.md (split_stack_return): Remove (use ..).
+	Specify LR as an input.
+
 2018-02-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR sanitizer/83987

gcc/config/rs6000/rs6000.md

@@ -13360,7 +13360,7 @@
 ;; Use r0 to stop regrename twiddling with lr restore insns emitted
 ;; after the call to __morestack.
 (define_insn "split_stack_return"
-  [(unspec_volatile [(use (reg:SI 0))] UNSPECV_SPLIT_STACK_RETURN)]
+  [(unspec_volatile [(reg:SI 0) (reg:SI LR_REGNO)] UNSPECV_SPLIT_STACK_RETURN)]
   ""
   "blr"
   [(set_attr "type" "jmpreg")])

gcc/testsuite/ChangeLog

+2018-02-10  Alan Modra  <amodra@gmail.com>
+
+	PR target/84300
+	* gcc.dg/pr84300.c: New.
+
 2018-02-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR sanitizer/83987

gcc/testsuite/gcc.dg/pr84300.c

+/* { dg-do compile } */
+/* { dg-require-effective-target split_stack } */
+/* { dg-options "-g -O2 -fsplit-stack -fno-omit-frame-pointer" } */
+
+void trap () { __builtin_trap (); }