S390x: improve performance by skipping Debug Hook if not needed

Change-Id: Ib4b2821f2941cdc131f9c75b89a3baced7554f8d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1991802 Reviewed-by: Junliang Yan <[email protected]> Commit-Queue: Milad Farazmand <[email protected]> Cr-Commit-Position: refs/heads/master@{#65644}
v8 · Jan 8, 2020 · d89f4ef · d89f4ef
1 parent 4273416
commit d89f4ef
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/codegen/s390/macro-assembler-s390.cc b/src/codegen/s390/macro-assembler-s390.cc
@@ -1289,8 +1289,8 @@ void MacroAssembler::CheckDebugHook(Register fun, Register new_target,
   ExternalReference debug_hook_active =
       ExternalReference::debug_hook_on_function_call_address(isolate());
   Move(r6, debug_hook_active);
-  tm(MemOperand(r6), Operand::Zero());
-  bne(&skip_hook);
+  tm(MemOperand(r6), Operand(0xFF));
+  beq(&skip_hook);
 
   {
     // Load receiver to pass it later to DebugOnFunctionCall hook.