ARM: Implement Reverse bits and bytes intrinsic.
- IntegerReverse
- LongReverse
- IntegerReverseBytes
- LongReverseBytes
- ShortReverseBytes
Change-Id: I3ec202696b245148a0237ff6e46ac3f1a3f8402a
diff --git a/compiler/utils/arm/assembler_arm32.cc b/compiler/utils/arm/assembler_arm32.cc
index ebca25b..0a227b2 100644
--- a/compiler/utils/arm/assembler_arm32.cc
+++ b/compiler/utils/arm/assembler_arm32.cc
@@ -750,6 +750,35 @@
}
+void Arm32Assembler::EmitMiscellaneous(Condition cond, uint8_t op1,
+ uint8_t op2, uint32_t a_part,
+ uint32_t rest) {
+ int32_t encoding = (static_cast<int32_t>(cond) << kConditionShift) |
+ B26 | B25 | B23 |
+ (op1 << 20) |
+ (a_part << 16) |
+ (op2 << 5) |
+ B4 |
+ rest;
+ Emit(encoding);
+}
+
+
+void Arm32Assembler::EmitReverseBytes(Register rd, Register rm, Condition cond,
+ uint8_t op1, uint8_t op2) {
+ CHECK_NE(rd, kNoRegister);
+ CHECK_NE(rm, kNoRegister);
+ CHECK_NE(cond, kNoCondition);
+ CHECK_NE(rd, PC);
+ CHECK_NE(rm, PC);
+
+ int32_t encoding = (static_cast<int32_t>(rd) << kRdShift) |
+ (0b1111 << 8) |
+ static_cast<int32_t>(rm);
+ EmitMiscellaneous(cond, op1, op2, 0b1111, encoding);
+}
+
+
void Arm32Assembler::rbit(Register rd, Register rm, Condition cond) {
CHECK_NE(rd, kNoRegister);
CHECK_NE(rm, kNoRegister);
@@ -764,6 +793,21 @@
}
+void Arm32Assembler::rev(Register rd, Register rm, Condition cond) {
+ EmitReverseBytes(rd, rm, cond, 0b011, 0b001);
+}
+
+
+void Arm32Assembler::rev16(Register rd, Register rm, Condition cond) {
+ EmitReverseBytes(rd, rm, cond, 0b011, 0b101);
+}
+
+
+void Arm32Assembler::revsh(Register rd, Register rm, Condition cond) {
+ EmitReverseBytes(rd, rm, cond, 0b111, 0b101);
+}
+
+
void Arm32Assembler::EmitMulOp(Condition cond, int32_t opcode,
Register rd, Register rn,
Register rm, Register rs) {