ARM: Strength reduction for floating-point division

For floating-point division by power of two constants, generate
multiplication by the reciprocal instead.

Change-Id: I39c79eeb26b60cc754ad42045362b79498c755be

2 files changed, 18 insertions, 0 deletions

diff --git a/compiler/dex/quick/mips/codegen_mips.h b/compiler/dex/quick/mips/codegen_mips.h
index dc6930c45b..7e9d80df65 100644
--- a/compiler/dex/quick/mips/codegen_mips.h
+++ b/compiler/dex/quick/mips/codegen_mips.h
@@ -31,6 +31,10 @@ class MipsMir2Lir FINAL : public Mir2Lir {
     bool SmallLiteralDivRem(Instruction::Code dalvik_opcode, bool is_div, RegLocation rl_src,
                             RegLocation rl_dest, int lit);
     bool EasyMultiply(RegLocation rl_src, RegLocation rl_dest, int lit) OVERRIDE;
+    void GenMultiplyByConstantFloat(RegLocation rl_dest, RegLocation rl_src1,
+                                    int32_t constant) OVERRIDE;
+    void GenMultiplyByConstantDouble(RegLocation rl_dest, RegLocation rl_src1,
+                                     int64_t constant) OVERRIDE;
     LIR* CheckSuspendUsingLoad() OVERRIDE;
     RegStorage LoadHelper(QuickEntrypointEnum trampoline) OVERRIDE;
     LIR* LoadBaseDisp(RegStorage r_base, int displacement, RegStorage r_dest,
diff --git a/compiler/dex/quick/mips/fp_mips.cc b/compiler/dex/quick/mips/fp_mips.cc
index 431591512e..0a7aa99c98 100644
--- a/compiler/dex/quick/mips/fp_mips.cc
+++ b/compiler/dex/quick/mips/fp_mips.cc
@@ -113,6 +113,20 @@ void MipsMir2Lir::GenArithOpDouble(Instruction::Code opcode,
   StoreValueWide(rl_dest, rl_result);
 }
 
+void MipsMir2Lir::GenMultiplyByConstantFloat(RegLocation rl_dest, RegLocation rl_src1,
+                                             int32_t constant) {
+  // TODO: need mips implementation.
+  UNUSED(rl_dest, rl_src1, constant);
+  LOG(FATAL) << "Unimplemented GenMultiplyByConstantFloat in mips";
+}
+
+void MipsMir2Lir::GenMultiplyByConstantDouble(RegLocation rl_dest, RegLocation rl_src1,
+                                              int64_t constant) {
+  // TODO: need mips implementation.
+  UNUSED(rl_dest, rl_src1, constant);
+  LOG(FATAL) << "Unimplemented GenMultiplyByConstantDouble in mips";
+}
+
 void MipsMir2Lir::GenConversion(Instruction::Code opcode, RegLocation rl_dest,
                                 RegLocation rl_src) {
   int op = kMipsNop;