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
diff --git a/compiler/dex/quick/arm/fp_arm.cc b/compiler/dex/quick/arm/fp_arm.cc
index 3eb7c83..2b2592d 100644
--- a/compiler/dex/quick/arm/fp_arm.cc
+++ b/compiler/dex/quick/arm/fp_arm.cc
@@ -113,6 +113,32 @@
StoreValueWide(rl_dest, rl_result);
}
+void ArmMir2Lir::GenMultiplyByConstantFloat(RegLocation rl_dest, RegLocation rl_src1,
+ int32_t constant) {
+ RegLocation rl_result;
+ RegStorage r_tmp = AllocTempSingle();
+ LoadConstantNoClobber(r_tmp, constant);
+ rl_src1 = LoadValue(rl_src1, kFPReg);
+ rl_result = EvalLoc(rl_dest, kFPReg, true);
+ NewLIR3(kThumb2Vmuls, rl_result.reg.GetReg(), rl_src1.reg.GetReg(), r_tmp.GetReg());
+ StoreValue(rl_dest, rl_result);
+}
+
+void ArmMir2Lir::GenMultiplyByConstantDouble(RegLocation rl_dest, RegLocation rl_src1,
+ int64_t constant) {
+ RegLocation rl_result;
+ RegStorage r_tmp = AllocTempDouble();
+ DCHECK(r_tmp.IsDouble());
+ LoadConstantWide(r_tmp, constant);
+ rl_src1 = LoadValueWide(rl_src1, kFPReg);
+ DCHECK(rl_src1.wide);
+ rl_result = EvalLocWide(rl_dest, kFPReg, true);
+ DCHECK(rl_dest.wide);
+ DCHECK(rl_result.wide);
+ NewLIR3(kThumb2Vmuld, rl_result.reg.GetReg(), rl_src1.reg.GetReg(), r_tmp.GetReg());
+ StoreValueWide(rl_dest, rl_result);
+}
+
void ArmMir2Lir::GenConversion(Instruction::Code opcode, RegLocation rl_dest, RegLocation rl_src) {
int op = kThumbBkpt;
int src_reg;