[PATCH 1/2] rs6000: New enum epilogue_type

[Segher Boessenkool]

We currently call rs6000_emit_epilogue with a boolean parameter saying
if this is for a sibcall.  We also need to create epilogues for
eh_return.  This isn't yet indicated directly: instead, we get an
eh_return epilogue if crtl->calls_eh_return and this is not a sibcall.

This patch changes things so there is a three-way enum argument.

What is called "normal" now can still actually be "eh_return".  The
rs6000_emit_epilogue function still uses an "int sibcall" variable
internally.

Tested on powerpc*-linux; committing to trunk.


Segher


2019-05-14  Segher Boessenkool  <segher@kernel.crashing.org>

	* config/rs6000/rs6000-protos.h (rs6000_emit_epilogue): Change
	arguments.
	* config/rs6000/rs6000.c (rs6000_emit_epilogue): Change arguments.
	* config/rs6000/rs6000.md (epilogue_type): New define_enum.
	(sibcall_epilogue): Adjust.
	(epilogue): Adjust.

---
 gcc/config/rs6000/rs6000-protos.h | 2 +-
 gcc/config/rs6000/rs6000.c        | 3 ++-
 gcc/config/rs6000/rs6000.md       | 6 ++++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/gcc/config/rs6000/rs6000-protos.h b/gcc/config/rs6000/rs6000-protos.h
index 8466368..9718ada 100644
--- a/gcc/config/rs6000/rs6000-protos.h
+++ b/gcc/config/rs6000/rs6000-protos.h
@@ -190,7 +190,7 @@ extern alias_set_type get_TOC_alias_set (void);
 extern void rs6000_emit_prologue (void);
 extern void rs6000_emit_load_toc_table (int);
 extern unsigned int rs6000_dbx_register_number (unsigned int, unsigned int);
-extern void rs6000_emit_epilogue (int);
+extern void rs6000_emit_epilogue (enum epilogue_type);
 extern void rs6000_expand_split_stack_prologue (void);
 extern void rs6000_split_stack_space_check (rtx, rtx);
 extern void rs6000_emit_eh_reg_restore (rtx, rtx);
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index b886f58..2992ba5 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -27874,8 +27874,9 @@ emit_cfa_restores (rtx cfa_restores)
 /* Emit function epilogue as insns.  */
 
 void
-rs6000_emit_epilogue (int sibcall)
+rs6000_emit_epilogue (enum epilogue_type epilogue_type)
 {
+  int sibcall = (epilogue_type == EPILOGUE_TYPE_SIBCALL);
   rs6000_stack_t *info;
   int restoring_GPRs_inline;
   int restoring_FPRs_inline;
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 8da7aba..c3181e7 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -174,6 +174,8 @@ (define_c_enum "unspecv"
    UNSPECV_SPEC_BARRIER         ; Speculation barrier
   ])
 
+; The three different kinds of epilogue.
+(define_enum "epilogue_type" [normal sibcall eh_return])
 
 ;; Define an insn type attribute.  This is used in function unit delay
 ;; computations.
@@ -10941,7 +10943,7 @@ (define_expand "sibcall_epilogue"
 {
   if (!TARGET_SCHED_PROLOG)
     emit_insn (gen_blockage ());
-  rs6000_emit_epilogue (TRUE);
+  rs6000_emit_epilogue (EPILOGUE_TYPE_SIBCALL);
   DONE;
 })
 
@@ -12881,7 +12883,7 @@ (define_expand "epilogue"
 {
   if (!TARGET_SCHED_PROLOG)
     emit_insn (gen_blockage ());
-  rs6000_emit_epilogue (FALSE);
+  rs6000_emit_epilogue (EPILOGUE_TYPE_NORMAL);
   DONE;
 })
 
-- 
1.8.3.1