RFR: 8338694: x86_64 intrinsic for tanh using libm

[Yudi Zheng]

On Wed, 21 Aug 2024 00:25:03 GMT, Srinivas Vamsi Parasa <duke at openjdk.org> wrote:

> The goal of this PR is to implement an x86_64 intrinsic for java.lang.Math.tanh() using libm
> 
> Benchmark (ops/ms) | Stock JDK | Tanh intrinsic | Speedup
> -- | -- | -- | --
> MathBench.tanhDouble | 70900 | 95618 | 1.35x

src/hotspot/share/jvmci/jvmciCompilerToVM.hpp line 114:

> 112:     static address dcos;
> 113:     static address dtan;
> 114:     static address dtanh;

Could you please add the following initializing code?

diff --git a/src/hotspot/share/jvmci/jvmciCompilerToVMInit.cpp b/src/hotspot/share/jvmci/jvmciCompilerToVMInit.cpp
index 9752d7edf99..1db9be70db0 100644
--- a/src/hotspot/share/jvmci/jvmciCompilerToVMInit.cpp
+++ b/src/hotspot/share/jvmci/jvmciCompilerToVMInit.cpp
@@ -259,6 +259,17 @@ void CompilerToVM::Data::initialize(JVMCI_TRAPS) {
   SET_TRIGFUNC(dpow);
 
 #undef SET_TRIGFUNC
+
+#define SET_TRIGFUNC_OR_NULL(name)                              \
+  if (StubRoutines::name() != nullptr) {                        \
+    name = StubRoutines::name();                                \
+  } else {                                                      \
+    name = nullptr;                                             \
+  }
+
+  SET_TRIGFUNC_OR_NULL(dtanh);
+
+#undef SET_TRIGFUNC_OR_NULL
 }
 
 static jboolean is_c1_supported(vmIntrinsics::ID id){
diff --git a/src/hotspot/share/jvmci/vmStructs_jvmci.cpp b/src/hotspot/share/jvmci/vmStructs_jvmci.cpp
index fea308503cf..189c1465589 100644
--- a/src/hotspot/share/jvmci/vmStructs_jvmci.cpp
+++ b/src/hotspot/share/jvmci/vmStructs_jvmci.cpp
@@ -126,6 +126,7 @@
   static_field(CompilerToVM::Data,             dsin,                                   address)                                      \
   static_field(CompilerToVM::Data,             dcos,                                   address)                                      \
   static_field(CompilerToVM::Data,             dtan,                                   address)                                      \
+  static_field(CompilerToVM::Data,             dtanh,                                  address)                                      \
   static_field(CompilerToVM::Data,             dexp,                                   address)                                      \
   static_field(CompilerToVM::Data,             dlog,                                   address)                                      \
   static_field(CompilerToVM::Data,             dlog10,                                 address)                                      \

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/20657#discussion_r1734655447