[PULL 55/85] target/arm: Convert FSQRT (vector) 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: 20241211163036.2297116-56-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/tcg/a64.decode      |  3 ++
 target/arm/tcg/translate-a64.c | 69 ++++++++++++++++++++++++----------
 2 files changed, 53 insertions(+), 19 deletions(-)

diff --git a/target/arm/tcg/a64.decode b/target/arm/tcg/a64.decode
index f46bd1a715e..1e0eb4a748e 100644
--- a/target/arm/tcg/a64.decode
+++ b/target/arm/tcg/a64.decode
@@ -1694,3 +1694,6 @@ FABS_v          0.00 1110 1.1 00000 11111 0 ..... .....   
  @qrr_sd
 
 FNEG_v          0.10 1110 111 11000 11111 0 ..... .....     @qrr_h
 FNEG_v          0.10 1110 1.1 00000 11111 0 ..... .....     @qrr_sd
+
+FSQRT_v         0.10 1110 111 11001 11111 0 ..... .....     @qrr_h
+FSQRT_v         0.10 1110 1.1 00001 11111 0 ..... .....     @qrr_sd
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index fd7f7ae7146..287e9338a45 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -9164,6 +9164,51 @@ static bool do_fabs_fneg_v(DisasContext *s, arg_qrr_e 
*a, GVecGen2Fn *fn)
 TRANS(FABS_v, do_fabs_fneg_v, a, gen_gvec_fabs)
 TRANS(FNEG_v, do_fabs_fneg_v, a, gen_gvec_fneg)
 
+static bool do_fp1_vector(DisasContext *s, arg_qrr_e *a,
+                          const FPScalar1 *f, int rmode)
+{
+    TCGv_i32 tcg_rmode = NULL;
+    TCGv_ptr fpst;
+    int check = fp_access_check_vector_hsd(s, a->q, a->esz);
+
+    if (check <= 0) {
+        return check == 0;
+    }
+
+    fpst = fpstatus_ptr(a->esz == MO_16 ? FPST_FPCR_F16 : FPST_FPCR);
+    if (rmode >= 0) {
+        tcg_rmode = gen_set_rmode(rmode, fpst);
+    }
+
+    if (a->esz == MO_64) {
+        TCGv_i64 t64 = tcg_temp_new_i64();
+
+        for (int pass = 0; pass < 2; ++pass) {
+            read_vec_element(s, t64, a->rn, pass, MO_64);
+            f->gen_d(t64, t64, fpst);
+            write_vec_element(s, t64, a->rd, pass, MO_64);
+        }
+    } else {
+        TCGv_i32 t32 = tcg_temp_new_i32();
+        void (*gen)(TCGv_i32, TCGv_i32, TCGv_ptr)
+            = (a->esz == MO_16 ? f->gen_h : f->gen_s);
+
+        for (int pass = 0, n = (a->q ? 16 : 8) >> a->esz; pass < n; ++pass) {
+            read_vec_element_i32(s, t32, a->rn, pass, a->esz);
+            gen(t32, t32, fpst);
+            write_vec_element_i32(s, t32, a->rd, pass, a->esz);
+        }
+    }
+    clear_vec_high(s, a->q, a->rd);
+
+    if (rmode >= 0) {
+        gen_restore_rmode(tcg_rmode, fpst);
+    }
+    return true;
+}
+
+TRANS(FSQRT_v, do_fp1_vector, a, &f_scalar_fsqrt, -1)
+
 /* Common vector code for handling integer to FP conversion */
 static void handle_simd_intfp_conv(DisasContext *s, int rd, int rn,
                                    int elements, int is_signed,
@@ -9461,9 +9506,6 @@ static void handle_2misc_64(DisasContext *s, int opcode, 
bool u,
      * requires them.
      */
     switch (opcode) {
-    case 0x7f: /* FSQRT */
-        gen_helper_vfp_sqrtd(tcg_rd, tcg_rn, tcg_fpstatus);
-        break;
     case 0x1a: /* FCVTNS */
     case 0x1b: /* FCVTMS */
     case 0x1c: /* FCVTAS */
@@ -9507,6 +9549,7 @@ static void handle_2misc_64(DisasContext *s, int opcode, 
bool u,
     case 0xb: /* ABS, NEG */
     case 0x2f: /* FABS */
     case 0x6f: /* FNEG */
+    case 0x7f: /* FSQRT */
         g_assert_not_reached();
     }
 }
@@ -10004,13 +10047,6 @@ static void disas_simd_two_reg_misc(DisasContext *s, 
uint32_t insn)
             }
             handle_2misc_fcmp_zero(s, opcode, false, u, is_q, size, rn, rd);
             return;
-        case 0x7f: /* FSQRT */
-            need_fpstatus = true;
-            if (size == 3 && !is_q) {
-                unallocated_encoding(s);
-                return;
-            }
-            break;
         case 0x1a: /* FCVTNS */
         case 0x1b: /* FCVTMS */
         case 0x3a: /* FCVTPS */
@@ -10104,6 +10140,7 @@ static void disas_simd_two_reg_misc(DisasContext *s, 
uint32_t insn)
         case 0x56: /* FCVTXN, FCVTXN2 */
         case 0x2f: /* FABS */
         case 0x6f: /* FNEG */
+        case 0x7f: /* FSQRT */
             unallocated_encoding(s);
             return;
         }
@@ -10176,9 +10213,6 @@ static void disas_simd_two_reg_misc(DisasContext *s, 
uint32_t insn)
             {
                 /* Special cases for 32 bit elements */
                 switch (opcode) {
-                case 0x7f: /* FSQRT */
-                    gen_helper_vfp_sqrts(tcg_res, tcg_op, tcg_fpstatus);
-                    break;
                 case 0x1a: /* FCVTNS */
                 case 0x1b: /* FCVTMS */
                 case 0x1c: /* FCVTAS */
@@ -10221,6 +10255,7 @@ static void disas_simd_two_reg_misc(DisasContext *s, 
uint32_t insn)
                 case 0x7: /* SQABS, SQNEG */
                 case 0x2f: /* FABS */
                 case 0x6f: /* FNEG */
+                case 0x7f: /* FSQRT */
                     g_assert_not_reached();
                 }
             }
@@ -10365,12 +10400,10 @@ static void disas_simd_two_reg_misc_fp16(DisasContext 
*s, uint32_t insn)
         break;
     case 0x7d: /* FRSQRTE */
         break;
-    case 0x7f: /* FSQRT (vector) */
-        only_in_vector = true;
-        break;
     default:
     case 0x2f: /* FABS */
     case 0x6f: /* FNEG */
+    case 0x7f: /* FSQRT (vector) */
         unallocated_encoding(s);
         return;
     }
@@ -10475,12 +10508,10 @@ static void disas_simd_two_reg_misc_fp16(DisasContext 
*s, uint32_t insn)
             case 0x7d: /* FRSQRTE */
                 gen_helper_rsqrte_f16(tcg_res, tcg_op, tcg_fpstatus);
                 break;
-            case 0x7f: /* FSQRT */
-                gen_helper_vfp_sqrth(tcg_res, tcg_op, tcg_fpstatus);
-                break;
             default:
             case 0x2f: /* FABS */
             case 0x6f: /* FNEG */
+            case 0x7f: /* FSQRT */
                 g_assert_not_reached();
             }
 
-- 
2.34.1