JDK-8233466 : aarch64: remove unnecessary load of mdo when profiling return and parameters type
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: openjdk8u292,11,14
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: aarch64
- Submitted: 2019-11-04
- Updated: 2021-02-02
- Resolved: 2019-11-28
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| JDK 11 | JDK 13 | JDK 14 |
|---|---|---|
| 11.0.7Fixed | 13.0.4Fixed | 14 b26Fixed  |
Description
When profiling return and parameters type from the interpreter on aarch64 platform, 'mdp' is loaded by test_method_data_pointer which is called by profile_return_type & profile_parameters_type.
It's not necessary to load mdo before calling __ profile_return_type or __ profile_parameters_type.
Patch:
diff --git a/src/hotspot/cpu/aarch64/templateInterpreterGenerator_aarch64.cpp b/src/hotspot/cpu/aarch64/templateInterpreterGenerator_aarch64.cpp
--- a/src/hotspot/cpu/aarch64/templateInterpreterGenerator_aarch64.cpp
+++ b/src/hotspot/cpu/aarch64/templateInterpreterGenerator_aarch64.cpp
@@ -444,7 +444,6 @@
Register obj = r0;
Register mdp = r1;
Register tmp = r2;
- __ ldr(mdp, Address(rmethod, Method::method_data_offset()));
__ profile_return_type(mdp, obj, tmp);
}
@@ -1634,13 +1633,8 @@
__ mov(rscratch2, true);
__ strb(rscratch2, do_not_unlock_if_synchronized);
- Label no_mdp;
Register mdp = r3;
- __ ldr(mdp, Address(rmethod, Method::method_data_offset()));
- __ cbz(mdp, no_mdp);
- __ add(mdp, mdp, in_bytes(MethodData::data_offset()));
__ profile_parameters_type(mdp, r1, r2);
- __ bind(no_mdp);
// increment invocation count & check for overflow
Label invocation_counter_overflow;
Comments
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