target/loongarch: Add fixed point arithmetic instruction translation

This includes:
- ADD.{W/D}, SUB.{W/D}
- ADDI.{W/D}, ADDU16ID
- ALSL.{W[U]/D}
- LU12I.W, LU32I.D LU52I.D
- SLT[U], SLT[U]I
- PCADDI, PCADDU12I, PCADDU18I, PCALAU12I
- AND, OR, NOR, XOR, ANDN, ORN
- MUL.{W/D}, MULH.{W[U]/D[U]}
- MULW.D.W[U]
- DIV.{W[U]/D[U]}, MOD.{W[U]/D[U]}
- ANDI, ORI, XORI

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-5-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/target/loongarch/translate.h b/target/loongarch/translate.h
index 6cc7f1a..9cc1251 100644
--- a/target/loongarch/translate.h
+++ b/target/loongarch/translate.h
@@ -10,11 +10,30 @@
 
 #include "exec/translator.h"
 
+#define TRANS(NAME, FUNC, ...) \
+    static bool trans_##NAME(DisasContext *ctx, arg_##NAME * a) \
+    { return FUNC(ctx, a, __VA_ARGS__); }
+
+/*
+ * If an operation is being performed on less than TARGET_LONG_BITS,
+ * it may require the inputs to be sign- or zero-extended; which will
+ * depend on the exact operation being performed.
+ */
+typedef enum {
+    EXT_NONE,
+    EXT_SIGN,
+    EXT_ZERO,
+} DisasExtend;
+
 typedef struct DisasContext {
     DisasContextBase base;
     target_ulong page_start;
     uint32_t opcode;
     int mem_idx;
+    TCGv zero;
+    /* Space for 3 operands plus 1 extra for address computation. */
+    TCGv temp[4];
+    uint8_t ntemp;
 } DisasContext;
 
 void generate_exception(DisasContext *ctx, int excp);