ART: Bit intrinsics for Mterp interpreter

Another batch of interpreter intrinisics, mostly around bit
manipulation.  Also some formatting changes and inclusion of a
comprehensive list of recognized intrinisics (to assist with
telling what's left to do).

Bug: 30933338

Benchmarks:
   20% Improvement for Reversi
   10% Improvement for Scimark2
    3% Improvement for ChessBench

Test: ART_TEST_INTERPRETER=true m test-art-host
Test: art/tools/run-libcore-tests --host (edited for force -Xint)

Note: Added intrinsics have existing test coverage via
082-inline-execute, 123-inline-execute2, 565-checker-rotate,
564-checker-bitcount, 566-checker-signum & 567-checker-compare

Change-Id: I29f0386e28eddba37c44f9ced44e7d5f8206bb47

1 files changed, 5 insertions, 0 deletions

diff --git a/runtime/stack.h b/runtime/stack.h
index 90a0aee353..5c9614aba4 100644
--- a/runtime/stack.h
+++ b/runtime/stack.h
@@ -197,6 +197,11 @@ class ShadowFrame {
     return *reinterpret_cast<const int32_t*>(vreg);
   }
 
+  // Shorts are extended to Ints in VRegs.  Interpreter intrinsics needs them as shorts.
+  int16_t GetVRegShort(size_t i) const {
+    return static_cast<int16_t>(GetVReg(i));
+  }
+
   uint32_t* GetVRegAddr(size_t i) {
     return &vregs_[i];
   }