gcc: xtensa: fix PR target/108876

gcc/
	PR target/108876
	* config/xtensa/xtensa.cc (xtensa_expand_epilogue): Drop emit_use
	for A0_REG.
	* config/xtensa/xtensa.md (sibcall, sibcall_internal)
	(sibcall_value, sibcall_value_internal): Add 'use' expression
	for A0_REG.

diff --git a/gcc/config/xtensa/xtensa.cc b/gcc/config/xtensa/xtensa.cc
index d0320efe21d488912a597ac728712b7b2693b9a6..5c1c713e122d9be81c211bc5740c832769760d0d 100644 (file)
--- a/gcc/config/xtensa/xtensa.cc
+++ b/gcc/config/xtensa/xtensa.cc
@@ -3548,8 +3548,6 @@ xtensa_expand_epilogue (bool sibcall_p)
                              gen_frame_mem (SImode, x));
            }
        }
-      if (sibcall_p)
-       emit_use (gen_rtx_REG (SImode, A0_REG));
 
       if (cfun->machine->current_frame_size > 0)
        {

diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index d3996b26cb5c1d1e6b6bba8e3a24ab6b8bc3b246..b8a8aaf976404a6b637b8f8902b1d589711ea92b 100644 (file)
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -2369,8 +2369,10 @@
    (set_attr "length"  "3")])
 
 (define_expand "sibcall"
-  [(call (match_operand 0 "memory_operand" "")
-        (match_operand 1 "" ""))]
+  [(parallel [
+    (call (match_operand 0 "memory_operand" "")
+         (match_operand 1 "" ""))
+    (use (reg:SI A0_REG))])]
   "!TARGET_WINDOWED_ABI"
 {
   xtensa_prepare_expand_call (0, operands);
@@ -2378,7 +2380,8 @@
 
 (define_insn "sibcall_internal"
   [(call (mem:SI (match_operand:SI 0 "call_insn_operand" "nic"))
-        (match_operand 1 "" "i"))]
+        (match_operand 1 "" "i"))
+   (use (reg:SI A0_REG))]
   "!TARGET_WINDOWED_ABI && SIBLING_CALL_P (insn)"
 {
   return xtensa_emit_sibcall (0, operands);
@@ -2388,9 +2391,11 @@
    (set_attr "length"  "3")])
 
 (define_expand "sibcall_value"
-  [(set (match_operand 0 "register_operand" "")
-       (call (match_operand 1 "memory_operand" "")
-             (match_operand 2 "" "")))]
+  [(parallel [
+    (set (match_operand 0 "register_operand" "")
+        (call (match_operand 1 "memory_operand" "")
+              (match_operand 2 "" "")))
+    (use (reg:SI A0_REG))])]
   "!TARGET_WINDOWED_ABI"
 {
   xtensa_prepare_expand_call (1, operands);
@@ -2399,7 +2404,8 @@
 (define_insn "sibcall_value_internal"
   [(set (match_operand 0 "register_operand" "=a")
        (call (mem:SI (match_operand:SI 1 "call_insn_operand" "nic"))
-             (match_operand 2 "" "i")))]
+             (match_operand 2 "" "i")))
+   (use (reg:SI A0_REG))]
   "!TARGET_WINDOWED_ABI && SIBLING_CALL_P (insn)"
 {
   return xtensa_emit_sibcall (1, operands);