target/loongarch: Add fixed point shift instruction translation

This includes:
- SLL.W, SRL.W, SRA.W, ROTR.W
- SLLI.W, SRLI.W, SRAI.W, ROTRI.W
- SLL.D, SRL.D, SRA.D, ROTR.D
- SLLI.D, SRLI.D, SRAI.D, ROTRI.D

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: <20220606124333.2060567-6-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 129 insertions, 0 deletions

diff --git a/target/loongarch/insn_trans/trans_shift.c.inc b/target/loongarch/insn_trans/trans_shift.c.inc
new file mode 100644
index 0000000000..5260af2337
--- /dev/null
+++ b/target/loongarch/insn_trans/trans_shift.c.inc
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ */
+
+static void gen_sll_w(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x1f);
+    tcg_gen_shl_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static void gen_srl_w(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x1f);
+    tcg_gen_shr_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static void gen_sra_w(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x1f);
+    tcg_gen_sar_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static void gen_sll_d(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x3f);
+    tcg_gen_shl_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static void gen_srl_d(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x3f);
+    tcg_gen_shr_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static void gen_sra_d(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x3f);
+    tcg_gen_sar_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static void gen_rotr_w(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv_i32 t1 = tcg_temp_new_i32();
+    TCGv_i32 t2 = tcg_temp_new_i32();
+    TCGv t0 = tcg_temp_new();
+
+    tcg_gen_andi_tl(t0, src2, 0x1f);
+
+    tcg_gen_trunc_tl_i32(t1, src1);
+    tcg_gen_trunc_tl_i32(t2, t0);
+
+    tcg_gen_rotr_i32(t1, t1, t2);
+    tcg_gen_ext_i32_tl(dest, t1);
+
+    tcg_temp_free_i32(t1);
+    tcg_temp_free_i32(t2);
+    tcg_temp_free(t0);
+}
+
+static void gen_rotr_d(TCGv dest, TCGv src1, TCGv src2)
+{
+    TCGv t0 = tcg_temp_new();
+    tcg_gen_andi_tl(t0, src2, 0x3f);
+    tcg_gen_rotr_tl(dest, src1, t0);
+    tcg_temp_free(t0);
+}
+
+static bool trans_srai_w(DisasContext *ctx, arg_srai_w *a)
+{
+    TCGv dest = gpr_dst(ctx, a->rd, EXT_NONE);
+    TCGv src1 = gpr_src(ctx, a->rj, EXT_ZERO);
+
+    tcg_gen_sextract_tl(dest, src1, a->imm, 32 - a->imm);
+    gen_set_gpr(a->rd, dest, EXT_NONE);
+
+    return true;
+}
+
+TRANS(sll_w, gen_rrr, EXT_ZERO, EXT_NONE, EXT_SIGN, gen_sll_w)
+TRANS(srl_w, gen_rrr, EXT_ZERO, EXT_NONE, EXT_SIGN, gen_srl_w)
+TRANS(sra_w, gen_rrr, EXT_SIGN, EXT_NONE, EXT_SIGN, gen_sra_w)
+TRANS(sll_d, gen_rrr, EXT_NONE, EXT_NONE, EXT_NONE, gen_sll_d)
+TRANS(srl_d, gen_rrr, EXT_NONE, EXT_NONE, EXT_NONE, gen_srl_d)
+TRANS(sra_d, gen_rrr, EXT_NONE, EXT_NONE, EXT_NONE, gen_sra_d)
+TRANS(rotr_w, gen_rrr, EXT_ZERO, EXT_NONE, EXT_SIGN, gen_rotr_w)
+TRANS(rotr_d, gen_rrr, EXT_NONE, EXT_NONE, EXT_NONE, gen_rotr_d)
+TRANS(slli_w, gen_rri_c, EXT_NONE, EXT_SIGN, tcg_gen_shli_tl)
+TRANS(slli_d, gen_rri_c, EXT_NONE, EXT_NONE, tcg_gen_shli_tl)
+TRANS(srli_w, gen_rri_c, EXT_ZERO, EXT_SIGN, tcg_gen_shri_tl)
+TRANS(srli_d, gen_rri_c, EXT_NONE, EXT_NONE, tcg_gen_shri_tl)
+TRANS(srai_d, gen_rri_c, EXT_NONE, EXT_NONE, tcg_gen_sari_tl)
+TRANS(rotri_w, gen_rri_v, EXT_NONE, EXT_NONE, gen_rotr_w)
+TRANS(rotri_d, gen_rri_c, EXT_NONE, EXT_NONE, tcg_gen_rotri_tl)
diff --git a/target/loongarch/insns.decode b/target/loongarch/insns.decode
index 8579c11984..673aee4be5 100644
--- a/target/loongarch/insns.decode
+++ b/target/loongarch/insns.decode
@@ -23,6 +23,8 @@
 #
 @rrr               .... ........ ..... rk:5 rj:5 rd:5    &rrr
 @r_i20                          .... ... imm:s20 rd:5    &r_i
+@rr_ui5           .... ........ ..... imm:5 rj:5 rd:5    &rr_i
+@rr_ui6            .... ........ .... imm:6 rj:5 rd:5    &rr_i
 @rr_i12                 .... ...... imm:s12 rj:5 rd:5    &rr_i
 @rr_ui12                 .... ...... imm:12 rj:5 rd:5    &rr_i
 @rr_i16                     .... .. imm:s16 rj:5 rd:5    &rr_i
@@ -77,3 +79,23 @@ addu16i_d       0001 00 ................ ..... .....     @rr_i16
 andi            0000 001101 ............ ..... .....     @rr_ui12
 ori             0000 001110 ............ ..... .....     @rr_ui12
 xori            0000 001111 ............ ..... .....     @rr_ui12
+
+#
+# Fixed point shift operation instruction
+#
+sll_w           0000 00000001 01110 ..... ..... .....    @rrr
+srl_w           0000 00000001 01111 ..... ..... .....    @rrr
+sra_w           0000 00000001 10000 ..... ..... .....    @rrr
+sll_d           0000 00000001 10001 ..... ..... .....    @rrr
+srl_d           0000 00000001 10010 ..... ..... .....    @rrr
+sra_d           0000 00000001 10011 ..... ..... .....    @rrr
+rotr_w          0000 00000001 10110 ..... ..... .....    @rrr
+rotr_d          0000 00000001 10111 ..... ..... .....    @rrr
+slli_w          0000 00000100 00001 ..... ..... .....    @rr_ui5
+slli_d          0000 00000100 0001 ...... ..... .....    @rr_ui6
+srli_w          0000 00000100 01001 ..... ..... .....    @rr_ui5
+srli_d          0000 00000100 0101 ...... ..... .....    @rr_ui6
+srai_w          0000 00000100 10001 ..... ..... .....    @rr_ui5
+srai_d          0000 00000100 1001 ...... ..... .....    @rr_ui6
+rotri_w         0000 00000100 11001 ..... ..... .....    @rr_ui5
+rotri_d         0000 00000100 1101 ...... ..... .....    @rr_ui6
diff --git a/target/loongarch/translate.c b/target/loongarch/translate.c
index 65c7dfd3da..d5640d5d79 100644
--- a/target/loongarch/translate.c
+++ b/target/loongarch/translate.c
@@ -146,6 +146,7 @@ static void gen_set_gpr(int reg_num, TCGv t, DisasExtend dst_ext)
 
 #include "decode-insns.c.inc"
 #include "insn_trans/trans_arith.c.inc"
+#include "insn_trans/trans_shift.c.inc"
 
 static void loongarch_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
 {