[[PATCH] 2/3] aarch64: Add C-function invocation for indirect branch pattern.

[Christoph Müllner]

aarch64 already uses a C-function for indirect calls
(aarch64_indirect_call_asm()). So let's add the same
abstraction for indirect branches.

This patch has no functional consequence.

gcc/
        * config/aarch64/aarch64.c (aarch64_indirect_branch_asm): Add
        function to output indirect branch instructions.
        * config/aarch64/aarch64.md (indirect_jump): Invoke
        aarch64_indirect_branch_asm() instead of outputting instructions
        direclty.
        * config/aarch64/aarch64.md (sibcall_insn): Likewise.
        * config/aarch64/aarch64.md (sibcall_value_insn): Likewise.
---
 gcc/config/aarch64/aarch64-protos.h | 1 +
 gcc/config/aarch64/aarch64.c        | 7 +++++++
 gcc/config/aarch64/aarch64.md       | 6 +++---
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/gcc/config/aarch64/aarch64-protos.h 
b/gcc/config/aarch64/aarch64-protos.h
index 2aa3f1fddaa..91ae8b7a0f9 100644
--- a/gcc/config/aarch64/aarch64-protos.h
+++ b/gcc/config/aarch64/aarch64-protos.h
@@ -802,6 +802,7 @@ extern const atomic_ool_names aarch64_ool_ldeor_names;
 tree aarch64_resolve_overloaded_builtin_general (location_t, tree, void *);
 
 const char *aarch64_sls_barrier (int);
+const char *aarch64_indirect_branch_asm (rtx);
 const char *aarch64_indirect_call_asm (rtx);
 extern bool aarch64_harden_sls_retbr_p (void);
 extern bool aarch64_harden_sls_blr_p (void);
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 264ccb8beb2..4799679f9e5 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -23659,6 +23659,13 @@ aarch64_asm_file_end ()
 #endif
 }
 
+const char *
+aarch64_indirect_branch_asm (rtx addr)
+{
+  output_asm_insn ("br\t%0", &addr);
+  return "";
+}
+
 const char *
 aarch64_indirect_call_asm (rtx addr)
 {
diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index eed06de3240..5cf660cc19f 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -471,7 +471,7 @@
   [(set (pc) (match_operand:DI 0 "register_operand" "r"))]
   ""
   {
-    output_asm_insn ("br\\t%0", operands);
+    aarch64_indirect_branch_asm (operands[0]);
     return aarch64_sls_barrier (aarch64_harden_sls_retbr_p ());
   }
   [(set_attr "type" "branch")
@@ -1104,7 +1104,7 @@
   {
     if (which_alternative == 0)
       {
-       output_asm_insn ("br\\t%0", operands);
+       aarch64_indirect_branch_asm (operands[0]);
        return aarch64_sls_barrier (aarch64_harden_sls_retbr_p ());
       }
     return "b\\t%c0";
@@ -1124,7 +1124,7 @@
   {
     if (which_alternative == 0)
       {
-       output_asm_insn ("br\\t%1", operands);
+       aarch64_indirect_branch_asm (operands[1]);
        return aarch64_sls_barrier (aarch64_harden_sls_retbr_p ());
       }
     return "b\\t%c1";
-- 
2.29.2