target/arm: Convert handle_scalar_simd_shli to decodetree

This includes SHL and SLI.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240912024114.1097832-25-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 13 insertions, 35 deletions

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index 6c2362b3bb..96803fe6e4 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -1291,6 +1291,7 @@ RSHRN_v         0.00 11110 .... ... 10001 1 ..... .....     @q_shri_s
 
 @shri_d         .... ..... 1 ...... ..... . rn:5 rd:5   \
                 &rri_e esz=3 imm=%neon_rshift_i6
+@shli_d         .... ..... 1 imm:6  ..... . rn:5 rd:5   &rri_e esz=3 
 
 SSHR_s          0101 11110 .... ... 00000 1 ..... .....     @shri_d
 USHR_s          0111 11110 .... ... 00000 1 ..... .....     @shri_d
@@ -1301,3 +1302,6 @@ URSHR_s         0111 11110 .... ... 00100 1 ..... .....     @shri_d
 SRSRA_s         0101 11110 .... ... 00110 1 ..... .....     @shri_d
 URSRA_s         0111 11110 .... ... 00110 1 ..... .....     @shri_d
 SRI_s           0111 11110 .... ... 01000 1 ..... .....     @shri_d
+
+SHL_s           0101 11110 .... ... 01010 1 ..... .....     @shli_d
+SLI_s           0111 11110 .... ... 01010 1 ..... .....     @shli_d
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index efd93a7f23..934746d2f2 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -7124,6 +7124,11 @@ static void gen_sri_d(TCGv_i64 dst, TCGv_i64 src, int64_t shift)
     }
 }
 
+static void gen_sli_d(TCGv_i64 dst, TCGv_i64 src, int64_t shift)
+{
+    tcg_gen_deposit_i64(dst, dst, src, shift, 64 - shift);
+}
+
 static bool do_vec_shift_imm_narrow(DisasContext *s, arg_qrri_e *a,
                                     WideShiftImmFn * const fns[3], MemOp sign)
 {
@@ -7201,6 +7206,9 @@ TRANS(SRSRA_s, do_scalar_shift_imm, a, gen_srsra_d, true, 0)
 TRANS(URSRA_s, do_scalar_shift_imm, a, gen_ursra_d, true, 0)
 TRANS(SRI_s, do_scalar_shift_imm, a, gen_sri_d, true, 0)
 
+TRANS(SHL_s, do_scalar_shift_imm, a, tcg_gen_shli_i64, false, 0)
+TRANS(SLI_s, do_scalar_shift_imm, a, gen_sli_d, true, 0)
+
 /* Shift a TCGv src by TCGv shift_amount, put result in dst.
  * Note that it is the caller's responsibility to ensure that the
  * shift amount is in range (ie 0..31 or 0..63) and provide the ARM
@@ -9417,38 +9425,6 @@ static void handle_shri_with_rndacc(TCGv_i64 tcg_res, TCGv_i64 tcg_src,
     }
 }
 
-/* SHL/SLI - Scalar shift left */
-static void handle_scalar_simd_shli(DisasContext *s, bool insert,
-                                    int immh, int immb, int opcode,
-                                    int rn, int rd)
-{
-    int size = 32 - clz32(immh) - 1;
-    int immhb = immh << 3 | immb;
-    int shift = immhb - (8 << size);
-    TCGv_i64 tcg_rn;
-    TCGv_i64 tcg_rd;
-
-    if (!extract32(immh, 3, 1)) {
-        unallocated_encoding(s);
-        return;
-    }
-
-    if (!fp_access_check(s)) {
-        return;
-    }
-
-    tcg_rn = read_fp_dreg(s, rn);
-    tcg_rd = insert ? read_fp_dreg(s, rd) : tcg_temp_new_i64();
-
-    if (insert) {
-        tcg_gen_deposit_i64(tcg_rd, tcg_rd, tcg_rn, shift, 64 - shift);
-    } else {
-        tcg_gen_shli_i64(tcg_rd, tcg_rn, shift);
-    }
-
-    write_fp_dreg(s, rd, tcg_rd);
-}
-
 /* SQSHRN/SQSHRUN - Saturating (signed/unsigned) shift right with
  * (signed/unsigned) narrowing */
 static void handle_vec_simd_sqshrn(DisasContext *s, bool is_scalar, bool is_q,
@@ -9900,9 +9876,6 @@ static void disas_simd_scalar_shift_imm(DisasContext *s, uint32_t insn)
     }
 
     switch (opcode) {
-    case 0x0a: /* SHL / SLI */
-        handle_scalar_simd_shli(s, is_u, immh, immb, opcode, rn, rd);
-        break;
     case 0x1c: /* SCVTF, UCVTF */
         handle_simd_shift_intfp_conv(s, true, false, is_u, immh, immb,
                                      opcode, rn, rd);
@@ -9940,6 +9913,7 @@ static void disas_simd_scalar_shift_imm(DisasContext *s, uint32_t insn)
     case 0x04: /* SRSHR / URSHR */
     case 0x06: /* SRSRA / URSRA */
     case 0x08: /* SRI */
+    case 0x0a: /* SHL / SLI */
         unallocated_encoding(s);
         break;
     }