ART: Move __memcmp16 from Bionic to ART
Handle __memcmp16 / MemCmp16 in ART. Import assembly implementations
for arm and mips from Bionic. Use a generic C version for all other
platforms.
Removes the memcmp16 quick entrypoint, as it is never used. Bump
the oat version and update thread.cc and checks to reflect the
structural change.
Change-Id: I54a5a1da2a0a43ef271c8aeda0bf2276b8b11ac6
diff --git a/runtime/arch/mips/memcmp16_mips.S b/runtime/arch/mips/memcmp16_mips.S
new file mode 100644
index 0000000..571ad75
--- /dev/null
+++ b/runtime/arch/mips/memcmp16_mips.S
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_ARCH_MIPS_MEMCMP16_MIPS_S_
+#define ART_RUNTIME_ARCH_MIPS_MEMCMP16_MIPS_S_
+
+#include "asm_support_mips.h"
+
+// u4 __memcmp16(const u2*, const u2*, size_t);
+ENTRY(__memcmp16)
+ li t0,0
+ li t1,0
+ beqz a2,done /* 0 length string */
+ beq a0,a1,done /* strings are identical */
+
+ /* Unoptimised... */
+1: lhu t0,0(a0)
+ lhu t1,0(a1)
+ addu a1,2
+ bne t0,t1,done
+ addu a0,2
+ subu a2,1
+ bnez a2,1b
+
+done:
+ subu v0,t0,t1
+ j ra
+END(__memcmp16)
+
+#endif // ART_RUNTIME_ARCH_MIPS_MEMCMP16_MIPS_S_