[RFC PATCH v4 1/5] accel/tcg: Avoid unnecessary call overhead from qemu_plugin_vcpu_mem_cb

[Max Chou <max.chou@sifive.com>]

If there are not any QEMU plugin memory callback functions, checking
before calling the qemu_plugin_vcpu_mem_cb function can reduce the
function call overhead.

Signed-off-by: Max Chou <max.chou@sifive.com>
---
 accel/tcg/ldst_common.c.inc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/accel/tcg/ldst_common.c.inc b/accel/tcg/ldst_common.c.inc
index c82048e377e..87ceb954873 100644
--- a/accel/tcg/ldst_common.c.inc
+++ b/accel/tcg/ldst_common.c.inc
@@ -125,7 +125,9 @@ void helper_st_i128(CPUArchState *env, uint64_t addr, Int128 val, MemOpIdx oi)
 
 static void plugin_load_cb(CPUArchState *env, abi_ptr addr, MemOpIdx oi)
 {
-    qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_R);
+    if (cpu_plugin_mem_cbs_enabled(env_cpu(env))) {
+        qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_R);
+    }
 }
 
 uint8_t cpu_ldb_mmu(CPUArchState *env, abi_ptr addr, MemOpIdx oi, uintptr_t ra)
@@ -188,7 +190,9 @@ Int128 cpu_ld16_mmu(CPUArchState *env, abi_ptr addr,
 
 static void plugin_store_cb(CPUArchState *env, abi_ptr addr, MemOpIdx oi)
 {
-    qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W);
+    if (cpu_plugin_mem_cbs_enabled(env_cpu(env))) {
+        qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W);
+    }
 }
 
 void cpu_stb_mmu(CPUArchState *env, abi_ptr addr, uint8_t val,
-- 
2.34.1