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[v2,2/2] tcg/arm: Expand epilogue inline

Message ID 20200216094143.14201-3-richard.henderson@linaro.org
State Superseded
Headers show
Series tcg/arm: Expand epilogue inline | expand

Commit Message

Richard Henderson Feb. 16, 2020, 9:41 a.m. UTC 
From: Richard Henderson <rth@twiddle.net>


It is, after all, just two instructions.

Profiling on a cortex-a15, using -d nochain to increase the number
of exit_tb that are executed, shows a minor improvement of 0.5%.

Signed-off-by: Richard Henderson <rth@twiddle.net>

---
 tcg/arm/tcg-target.inc.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

-- 
2.23.0
diff mbox series

Patch

diff --git a/tcg/arm/tcg-target.inc.c b/tcg/arm/tcg-target.inc.c
index e1aa740ba4..6aa7757aac 100644
--- a/tcg/arm/tcg-target.inc.c
+++ b/tcg/arm/tcg-target.inc.c
@@ -1745,7 +1745,6 @@  static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
 #endif
 }
 
-static tcg_insn_unit *tb_ret_addr;
 static void tcg_out_epilogue(TCGContext *s);
 
 static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
@@ -1756,14 +1755,8 @@  static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
 
     switch (opc) {
     case INDEX_op_exit_tb:
-        /* Reuse the zeroing that exists for goto_ptr.  */
-        a0 = args[0];
-        if (a0 == 0) {
-            tcg_out_goto(s, COND_AL, s->code_gen_epilogue);
-        } else {
-            tcg_out_movi32(s, COND_AL, TCG_REG_R0, args[0]);
-            tcg_out_goto(s, COND_AL, tb_ret_addr);
-        }
+        tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R0, args[0]);
+        tcg_out_epilogue(s);
         break;
     case INDEX_op_goto_tb:
         {
@@ -2309,7 +2302,6 @@  static void tcg_target_qemu_prologue(TCGContext *s)
      */
     s->code_gen_epilogue = s->code_ptr;
     tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R0, 0);
-    tb_ret_addr = s->code_ptr;
     tcg_out_epilogue(s);
 }