MIPS32: java.lang.String.getChars

Use memcpy(3) to copy characters under the assumption that memcpy()
has been hand optimized for best performance on the platform being
tested.

Test: run-test --optimizing 020-string
Test: run-test 020-string
Test: run-test --no-prebuild --optimizing 020-string
Test: run-test --no-prebuild 020-string
Test: run-test --optimizing 082-inline-execute
Test: run-test 082-inline-execute
Test: run-test --no-prebuild --optimizing 082-inline-execute
Test: run-test --no-prebuild 082-inline-execute
Test: mma -j2 ART_TEST_OPTIMIZING=true test-art-target-run-test
Test: booted MIPS32R2 emulator.

Note: Tested against both the MIPS32R2, and MIPS64R6 emulators.

Change-Id: I4192cf6244db120c8de5cc4932d4132acfc9740d

1 files changed, 7 insertions, 0 deletions

diff --git a/compiler/utils/mips/assembler_mips.cc b/compiler/utils/mips/assembler_mips.cc
index 3dcad6a6b9..5e83e825ed 100644
--- a/compiler/utils/mips/assembler_mips.cc
+++ b/compiler/utils/mips/assembler_mips.cc
@@ -635,6 +635,13 @@ void MipsAssembler::Ins(Register rd, Register rt, int pos, int size) {
   DsFsmInstrRrr(EmitR(0x1f, rt, rd, static_cast<Register>(pos + size - 1), pos, 0x04), rd, rd, rt);
 }
 
+void MipsAssembler::Lsa(Register rd, Register rs, Register rt, int saPlusOne) {
+  CHECK(IsR6());
+  CHECK(1 <= saPlusOne && saPlusOne <= 4) << saPlusOne;
+  int sa = saPlusOne - 1;
+  DsFsmInstrRrr(EmitR(0x0, rs, rt, rd, sa, 0x05), rd, rs, rt);
+}
+
 void MipsAssembler::Lb(Register rt, Register rs, uint16_t imm16) {
   DsFsmInstrRrr(EmitI(0x20, rs, rt, imm16), rt, rs, rs);
 }