This PR is one of those with a really obvious cause, and fix. There's
nothing in the unspec rtl to say the insn needs lr!
Bootstrapped and regression tested powerpc64le-linux. OK?
PR target/84300
gcc/
* config/rs6000/rs6000.md (split_stack_return): Use LR.
gcc/testsuite/
* gcc.dg/pr84300.c: New.
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 33f0d95..287461f 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -13359,7 +13359,8 @@ (define_insn "load_split_stack_limit_si"
;; 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 [(use (reg:SI 0)) (use (reg:SI LR_REGNO))]
+ UNSPECV_SPLIT_STACK_RETURN)]
""
"blr"
[(set_attr "type" "jmpreg")])
diff --git a/gcc/testsuite/gcc.dg/pr84300.c b/gcc/testsuite/gcc.dg/pr84300.c
new file mode 100644
index 0000000..6016799
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr84300.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target split_stack } */
+/* { dg-options "-g -O2 -fsplit-stack -fno-omit-frame-pointer" } */
+
+void trap () { __builtin_trap (); }
--
Alan Modra
Australia Development Lab, IBM
