[Qemu-devel] [PATCH v6 25/35] target/riscv: make ADD/SUB/OR/XOR/AND insn use arg lists

[Bastian Koppelmann <kbastian@mail.uni-paderborn.de>]

manual decoding in gen_arith() is not necessary with decodetree. For now
the function is called trans_arith as the original gen_arith still
exists. The former will be renamed to gen_arith as soon as the old
gen_arith can be removed.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
---
 target/riscv/insn32.decode              |  3 +-
 target/riscv/insn_trans/trans_rvi.inc.c | 21 +++++--------
 target/riscv/translate.c                | 40 +++++++++++++++----------
 3 files changed, 34 insertions(+), 30 deletions(-)

diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index d6b4197841..6f3ab7aa52 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -36,11 +36,12 @@
 # Argument sets:
 &b    imm rs2 rs1
 &i    imm rs1 rd
+&r    rd rs1 rs2
 &shift     shamt rs1 rd
 &atomic    aq rl rs2 rs1 rd
 
 # Formats 32:
-@r       .......   ..... ..... ... ..... .......                   %rs2 %rs1 %rd
+@r       .......   ..... ..... ... ..... ....... &r                %rs2 %rs1 %rd
 @i       ............    ..... ... ..... ....... &i      imm=%imm_i     %rs1 %rd
 @b       .......   ..... ..... ... ..... ....... &b      imm=%imm_b %rs2 %rs1
 @s       .......   ..... ..... ... ..... .......         imm=%imm_s %rs2 %rs1
diff --git a/target/riscv/insn_trans/trans_rvi.inc.c b/target/riscv/insn_trans/trans_rvi.inc.c
index 4e51490f94..4c79e424ae 100644
--- a/target/riscv/insn_trans/trans_rvi.inc.c
+++ b/target/riscv/insn_trans/trans_rvi.inc.c
@@ -312,14 +312,12 @@ static bool trans_srai(DisasContext *ctx, arg_srai *a)
 
 static bool trans_add(DisasContext *ctx, arg_add *a)
 {
-    gen_arith(ctx, OPC_RISC_ADD, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &tcg_gen_add_tl);
 }
 
 static bool trans_sub(DisasContext *ctx, arg_sub *a)
 {
-    gen_arith(ctx, OPC_RISC_SUB, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &tcg_gen_sub_tl);
 }
 
 static bool trans_sll(DisasContext *ctx, arg_sll *a)
@@ -342,8 +340,7 @@ static bool trans_sltu(DisasContext *ctx, arg_sltu *a)
 
 static bool trans_xor(DisasContext *ctx, arg_xor *a)
 {
-    gen_arith(ctx, OPC_RISC_XOR, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &tcg_gen_xor_tl);
 }
 
 static bool trans_srl(DisasContext *ctx, arg_srl *a)
@@ -360,14 +357,12 @@ static bool trans_sra(DisasContext *ctx, arg_sra *a)
 
 static bool trans_or(DisasContext *ctx, arg_or *a)
 {
-    gen_arith(ctx, OPC_RISC_OR, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &tcg_gen_or_tl);
 }
 
 static bool trans_and(DisasContext *ctx, arg_and *a)
 {
-    gen_arith(ctx, OPC_RISC_AND, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &tcg_gen_and_tl);
 }
 
 #ifdef TARGET_RISCV64
@@ -414,14 +409,12 @@ static bool trans_sraiw(DisasContext *ctx, arg_sraiw *a)
 
 static bool trans_addw(DisasContext *ctx, arg_addw *a)
 {
-    gen_arith(ctx, OPC_RISC_ADDW, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &gen_addw);
 }
 
 static bool trans_subw(DisasContext *ctx, arg_subw *a)
 {
-    gen_arith(ctx, OPC_RISC_SUBW, a->rd, a->rs1, a->rs2);
-    return true;
+    return trans_arith(ctx, a, &gen_subw);
 }
 
 static bool trans_sllw(DisasContext *ctx, arg_sllw *a)
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index 55b10fdd64..f691cbcd80 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -192,12 +192,6 @@ static void gen_arith(DisasContext *ctx, uint32_t opc, int rd, int rs1,
     gen_get_gpr(source2, rs2);
 
     switch (opc) {
-    CASE_OP_32_64(OPC_RISC_ADD):
-        tcg_gen_add_tl(source1, source1, source2);
-        break;
-    CASE_OP_32_64(OPC_RISC_SUB):
-        tcg_gen_sub_tl(source1, source1, source2);
-        break;
 #if defined(TARGET_RISCV64)
     case OPC_RISC_SLLW:
         tcg_gen_andi_tl(source2, source2, 0x1F);
@@ -214,9 +208,6 @@ static void gen_arith(DisasContext *ctx, uint32_t opc, int rd, int rs1,
     case OPC_RISC_SLTU:
         tcg_gen_setcond_tl(TCG_COND_LTU, source1, source1, source2);
         break;
-    case OPC_RISC_XOR:
-        tcg_gen_xor_tl(source1, source1, source2);
-        break;
 #if defined(TARGET_RISCV64)
     case OPC_RISC_SRLW:
         /* clear upper 32 */
@@ -242,12 +233,6 @@ static void gen_arith(DisasContext *ctx, uint32_t opc, int rd, int rs1,
         tcg_gen_andi_tl(source2, source2, TARGET_LONG_BITS - 1);
         tcg_gen_sar_tl(source1, source1, source2);
         break;
-    case OPC_RISC_OR:
-        tcg_gen_or_tl(source1, source1, source2);
-        break;
-    case OPC_RISC_AND:
-        tcg_gen_and_tl(source1, source1, source2);
-        break;
     CASE_OP_32_64(OPC_RISC_MUL):
         tcg_gen_mul_tl(source1, source1, source2);
         break;
@@ -641,8 +626,33 @@ static void gen_addw(TCGv ret, TCGv arg1, TCGv arg2)
     tcg_gen_add_tl(ret, arg1, arg2);
     tcg_gen_ext32s_tl(ret, ret);
 }
+
+static void gen_subw(TCGv ret, TCGv arg1, TCGv arg2)
+{
+    tcg_gen_sub_tl(ret, arg1, arg2);
+    tcg_gen_ext32s_tl(ret, ret);
+}
+
 #endif
 
+static bool trans_arith(DisasContext *ctx, arg_r *a,
+                        void(*func)(TCGv, TCGv, TCGv))
+{
+    TCGv source1, source2;
+    source1 = tcg_temp_new();
+    source2 = tcg_temp_new();
+
+    gen_get_gpr(source1, a->rs1);
+    gen_get_gpr(source2, a->rs2);
+
+    (*func)(source1, source1, source2);
+
+    gen_set_gpr(a->rd, source1);
+    tcg_temp_free(source1);
+    tcg_temp_free(source2);
+    return true;
+}
+
 /* Include insn module translation function */
 #include "insn_trans/trans_rvi.inc.c"
 #include "insn_trans/trans_rvm.inc.c"
-- 
2.20.1