[gcc(refs/users/wschmidt/heads/dd2)] rs6000: Don't do a hashchk for a sibcall

[William Schmidt]

https://gcc.gnu.org/g:dfb8d9893e2374a27af59dbb4fa1abe174e53d5e

commit dfb8d9893e2374a27af59dbb4fa1abe174e53d5e
Author: Bill Schmidt <wschmidt@linux.ibm.com>
Date:   Wed Mar 17 17:16:57 2021 -0500

    rs6000: Don't do a hashchk for a sibcall
    
    2021-03-17  Bill Schmidt  <wschmidt@linux.ibm.com>
    
    gcc/
            * config/rs6000/rs6000-logue.c (rs6000_emit_epilogue): Skip the
            ROP check for a sibcall.

Diff:
---
 gcc/config/rs6000/rs6000-logue.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gcc/config/rs6000/rs6000-logue.c b/gcc/config/rs6000/rs6000-logue.c
index de99f708803..277b2e656f4 100644
--- a/gcc/config/rs6000/rs6000-logue.c
+++ b/gcc/config/rs6000/rs6000-logue.c
@@ -5013,8 +5013,10 @@ rs6000_emit_epilogue (enum epilogue_type epilogue_type)
       emit_insn (gen_add3_insn (sp_reg_rtx, sp_reg_rtx, sa));
     }
 
-  /* The ROP hash check must occur after the stack pointer is restored.  */
-  if (rs6000_rop_protect)
+  /* The ROP hash check must occur after the stack pointer is restored,
+     and is not performed for a sibcall.  */
+  if (rs6000_rop_protect && epilogue_type != EPILOGUE_TYPE_SIBCALL)
+
     {
       gcc_assert (DEFAULT_ABI == ABI_ELFv2);
       rtx stack_ptr = gen_rtx_REG (Pmode, STACK_POINTER_REGNUM);