ARM: Combine multiply accumulate operations.
Try to combine integer multiply and add(sub) into a MAC operation.
For AArch64, also try to combine long type multiply and add(sub).
Change-Id: Ic85812e941eb5a66abc355cab81a4dd16de1b66e
diff --git a/compiler/dex/quick/arm/int_arm.cc b/compiler/dex/quick/arm/int_arm.cc
index 1a7b439..fe1d126 100644
--- a/compiler/dex/quick/arm/int_arm.cc
+++ b/compiler/dex/quick/arm/int_arm.cc
@@ -1075,6 +1075,17 @@
return NewLIR3(kThumb2Vstms, r_base.GetReg(), rs_fr0.GetReg(), count);
}
+void ArmMir2Lir::GenMaddMsubInt(RegLocation rl_dest, RegLocation rl_src1, RegLocation rl_src2,
+ RegLocation rl_src3, bool is_sub) {
+ rl_src1 = LoadValue(rl_src1, kCoreReg);
+ rl_src2 = LoadValue(rl_src2, kCoreReg);
+ rl_src3 = LoadValue(rl_src3, kCoreReg);
+ RegLocation rl_result = EvalLoc(rl_dest, kCoreReg, true);
+ NewLIR4(is_sub ? kThumb2Mls : kThumb2Mla, rl_result.reg.GetReg(), rl_src1.reg.GetReg(),
+ rl_src2.reg.GetReg(), rl_src3.reg.GetReg());
+ StoreValue(rl_dest, rl_result);
+}
+
void ArmMir2Lir::GenMultiplyByTwoBitMultiplier(RegLocation rl_src,
RegLocation rl_result, int lit,
int first_bit, int second_bit) {