[PULL 28/38] target/arm: Convert vector [US]QSHRN, [US]QRSHRN, SQSHRUN to decodetree

[Peter Maydell]

From: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240912024114.1097832-29-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/tcg/a64.decode      |  24 +++++
 target/arm/tcg/translate-a64.c | 176 ++++++++++++++++++++++++++++++---
 2 files changed, 186 insertions(+), 14 deletions(-)

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index 63e04ddfcde..042dc79d88a 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -1302,6 +1302,30 @@ SQSHLU_vi       0.10 11110 .... ... 01100 1 ..... .....  
   @q_shli_h
 SQSHLU_vi       0.10 11110 .... ... 01100 1 ..... .....     @q_shli_s
 SQSHLU_vi       0.10 11110 .... ... 01100 1 ..... .....     @q_shli_d
 
+SQSHRN_v        0.00 11110 .... ... 10010 1 ..... .....     @q_shri_b
+SQSHRN_v        0.00 11110 .... ... 10010 1 ..... .....     @q_shri_h
+SQSHRN_v        0.00 11110 .... ... 10010 1 ..... .....     @q_shri_s
+
+UQSHRN_v        0.10 11110 .... ... 10010 1 ..... .....     @q_shri_b
+UQSHRN_v        0.10 11110 .... ... 10010 1 ..... .....     @q_shri_h
+UQSHRN_v        0.10 11110 .... ... 10010 1 ..... .....     @q_shri_s
+
+SQSHRUN_v       0.10 11110 .... ... 10000 1 ..... .....     @q_shri_b
+SQSHRUN_v       0.10 11110 .... ... 10000 1 ..... .....     @q_shri_h
+SQSHRUN_v       0.10 11110 .... ... 10000 1 ..... .....     @q_shri_s
+
+SQRSHRN_v       0.00 11110 .... ... 10011 1 ..... .....     @q_shri_b
+SQRSHRN_v       0.00 11110 .... ... 10011 1 ..... .....     @q_shri_h
+SQRSHRN_v       0.00 11110 .... ... 10011 1 ..... .....     @q_shri_s
+
+UQRSHRN_v       0.10 11110 .... ... 10011 1 ..... .....     @q_shri_b
+UQRSHRN_v       0.10 11110 .... ... 10011 1 ..... .....     @q_shri_h
+UQRSHRN_v       0.10 11110 .... ... 10011 1 ..... .....     @q_shri_s
+
+SQRSHRUN_v      0.10 11110 .... ... 10001 1 ..... .....     @q_shri_b
+SQRSHRUN_v      0.10 11110 .... ... 10001 1 ..... .....     @q_shri_h
+SQRSHRUN_v      0.10 11110 .... ... 10001 1 ..... .....     @q_shri_s
+
 # Advanced SIMD scalar shift by immediate
 
 @shri_d         .... ..... 1 ...... ..... . rn:5 rd:5   \
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 77324e0145f..e6290e11453 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -7163,6 +7163,122 @@ static bool do_vec_shift_imm_narrow(DisasContext *s, 
arg_qrri_e *a,
     return true;
 }
 
+static void gen_sqshrn_b(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    tcg_gen_sari_i64(d, s, i);
+    tcg_gen_ext16u_i64(d, d);
+    gen_helper_neon_narrow_sat_s8(d, tcg_env, d);
+}
+
+static void gen_sqshrn_h(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    tcg_gen_sari_i64(d, s, i);
+    tcg_gen_ext32u_i64(d, d);
+    gen_helper_neon_narrow_sat_s16(d, tcg_env, d);
+}
+
+static void gen_sqshrn_s(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_sshr_d(d, s, i);
+    gen_helper_neon_narrow_sat_s32(d, tcg_env, d);
+}
+
+static void gen_uqshrn_b(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    tcg_gen_shri_i64(d, s, i);
+    gen_helper_neon_narrow_sat_u8(d, tcg_env, d);
+}
+
+static void gen_uqshrn_h(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    tcg_gen_shri_i64(d, s, i);
+    gen_helper_neon_narrow_sat_u16(d, tcg_env, d);
+}
+
+static void gen_uqshrn_s(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_ushr_d(d, s, i);
+    gen_helper_neon_narrow_sat_u32(d, tcg_env, d);
+}
+
+static void gen_sqshrun_b(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    tcg_gen_sari_i64(d, s, i);
+    tcg_gen_ext16u_i64(d, d);
+    gen_helper_neon_unarrow_sat8(d, tcg_env, d);
+}
+
+static void gen_sqshrun_h(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    tcg_gen_sari_i64(d, s, i);
+    tcg_gen_ext32u_i64(d, d);
+    gen_helper_neon_unarrow_sat16(d, tcg_env, d);
+}
+
+static void gen_sqshrun_s(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_sshr_d(d, s, i);
+    gen_helper_neon_unarrow_sat32(d, tcg_env, d);
+}
+
+static void gen_sqrshrn_b(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_srshr_bhs(d, s, i);
+    tcg_gen_ext16u_i64(d, d);
+    gen_helper_neon_narrow_sat_s8(d, tcg_env, d);
+}
+
+static void gen_sqrshrn_h(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_srshr_bhs(d, s, i);
+    tcg_gen_ext32u_i64(d, d);
+    gen_helper_neon_narrow_sat_s16(d, tcg_env, d);
+}
+
+static void gen_sqrshrn_s(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_srshr_d(d, s, i);
+    gen_helper_neon_narrow_sat_s32(d, tcg_env, d);
+}
+
+static void gen_uqrshrn_b(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_urshr_bhs(d, s, i);
+    gen_helper_neon_narrow_sat_u8(d, tcg_env, d);
+}
+
+static void gen_uqrshrn_h(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_urshr_bhs(d, s, i);
+    gen_helper_neon_narrow_sat_u16(d, tcg_env, d);
+}
+
+static void gen_uqrshrn_s(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_urshr_d(d, s, i);
+    gen_helper_neon_narrow_sat_u32(d, tcg_env, d);
+}
+
+static void gen_sqrshrun_b(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_srshr_bhs(d, s, i);
+    tcg_gen_ext16u_i64(d, d);
+    gen_helper_neon_unarrow_sat8(d, tcg_env, d);
+}
+
+static void gen_sqrshrun_h(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_srshr_bhs(d, s, i);
+    tcg_gen_ext32u_i64(d, d);
+    gen_helper_neon_unarrow_sat16(d, tcg_env, d);
+}
+
+static void gen_sqrshrun_s(TCGv_i64 d, TCGv_i64 s, int64_t i)
+{
+    gen_srshr_d(d, s, i);
+    gen_helper_neon_unarrow_sat32(d, tcg_env, d);
+}
+
 static WideShiftImmFn * const shrn_fns[] = {
     tcg_gen_shri_i64,
     tcg_gen_shri_i64,
@@ -7177,6 +7293,48 @@ static WideShiftImmFn * const rshrn_fns[] = {
 };
 TRANS(RSHRN_v, do_vec_shift_imm_narrow, a, rshrn_fns, 0)
 
+static WideShiftImmFn * const sqshrn_fns[] = {
+    gen_sqshrn_b,
+    gen_sqshrn_h,
+    gen_sqshrn_s,
+};
+TRANS(SQSHRN_v, do_vec_shift_imm_narrow, a, sqshrn_fns, MO_SIGN)
+
+static WideShiftImmFn * const uqshrn_fns[] = {
+    gen_uqshrn_b,
+    gen_uqshrn_h,
+    gen_uqshrn_s,
+};
+TRANS(UQSHRN_v, do_vec_shift_imm_narrow, a, uqshrn_fns, 0)
+
+static WideShiftImmFn * const sqshrun_fns[] = {
+    gen_sqshrun_b,
+    gen_sqshrun_h,
+    gen_sqshrun_s,
+};
+TRANS(SQSHRUN_v, do_vec_shift_imm_narrow, a, sqshrun_fns, MO_SIGN)
+
+static WideShiftImmFn * const sqrshrn_fns[] = {
+    gen_sqrshrn_b,
+    gen_sqrshrn_h,
+    gen_sqrshrn_s,
+};
+TRANS(SQRSHRN_v, do_vec_shift_imm_narrow, a, sqrshrn_fns, MO_SIGN)
+
+static WideShiftImmFn * const uqrshrn_fns[] = {
+    gen_uqrshrn_b,
+    gen_uqrshrn_h,
+    gen_uqrshrn_s,
+};
+TRANS(UQRSHRN_v, do_vec_shift_imm_narrow, a, uqrshrn_fns, 0)
+
+static WideShiftImmFn * const sqrshrun_fns[] = {
+    gen_sqrshrun_b,
+    gen_sqrshrun_h,
+    gen_sqrshrun_s,
+};
+TRANS(SQRSHRUN_v, do_vec_shift_imm_narrow, a, sqrshrun_fns, MO_SIGN)
+
 /*
  * Advanced SIMD Scalar Shift by Immediate
  */
@@ -10514,20 +10672,6 @@ static void disas_simd_shift_imm(DisasContext *s, 
uint32_t insn)
     }
 
     switch (opcode) {
-    case 0x10: /* SHRN / SQSHRUN */
-    case 0x11: /* RSHRN / SQRSHRUN */
-        if (is_u) {
-            handle_vec_simd_sqshrn(s, false, is_q, false, true, immh, immb,
-                                   opcode, rn, rd);
-        } else {
-            unallocated_encoding(s);
-        }
-        break;
-    case 0x12: /* SQSHRN / UQSHRN */
-    case 0x13: /* SQRSHRN / UQRSHRN */
-        handle_vec_simd_sqshrn(s, false, is_q, is_u, is_u, immh, immb,
-                               opcode, rn, rd);
-        break;
     case 0x1c: /* SCVTF / UCVTF */
         handle_simd_shift_intfp_conv(s, false, is_q, is_u, immh, immb,
                                      opcode, rn, rd);
@@ -10544,6 +10688,10 @@ static void disas_simd_shift_imm(DisasContext *s, 
uint32_t insn)
     case 0x0a: /* SHL / SLI */
     case 0x0c: /* SQSHLU */
     case 0x0e: /* SQSHL, UQSHL */
+    case 0x10: /* SHRN / SQSHRUN */
+    case 0x11: /* RSHRN / SQRSHRUN */
+    case 0x12: /* SQSHRN / UQSHRN */
+    case 0x13: /* SQRSHRN / UQRSHRN */
     case 0x14: /* SSHLL / USHLL */
         unallocated_encoding(s);
         return;
-- 
2.34.1