target/arm: Implement ARMv8.2-DotProd

We've already added the helpers with an SVE patch, all that remains
is to wire up the aa64 and aa32 translators.  Enable the feature
within -cpu max for CONFIG_USER_ONLY.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180627043328.11531-36-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 53 insertions, 21 deletions

diff --git a/target/arm/translate.c b/target/arm/translate.c
index a7a980b..f845da7 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -7762,9 +7762,10 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
  */
 static int disas_neon_insn_3same_ext(DisasContext *s, uint32_t insn)
 {
-    gen_helper_gvec_3_ptr *fn_gvec_ptr;
-    int rd, rn, rm, rot, size, opr_sz;
-    TCGv_ptr fpst;
+    gen_helper_gvec_3 *fn_gvec = NULL;
+    gen_helper_gvec_3_ptr *fn_gvec_ptr = NULL;
+    int rd, rn, rm, opr_sz;
+    int data = 0;
     bool q;
 
     q = extract32(insn, 6, 1);
@@ -7777,8 +7778,8 @@ static int disas_neon_insn_3same_ext(DisasContext *s, uint32_t insn)
 
     if ((insn & 0xfe200f10) == 0xfc200800) {
         /* VCMLA -- 1111 110R R.1S .... .... 1000 ...0 .... */
-        size = extract32(insn, 20, 1);
-        rot = extract32(insn, 23, 2);
+        int size = extract32(insn, 20, 1);
+        data = extract32(insn, 23, 2); /* rot */
         if (!arm_dc_feature(s, ARM_FEATURE_V8_FCMA)
             || (!size && !arm_dc_feature(s, ARM_FEATURE_V8_FP16))) {
             return 1;
@@ -7786,13 +7787,20 @@ static int disas_neon_insn_3same_ext(DisasContext *s, uint32_t insn)
         fn_gvec_ptr = size ? gen_helper_gvec_fcmlas : gen_helper_gvec_fcmlah;
     } else if ((insn & 0xfea00f10) == 0xfc800800) {
         /* VCADD -- 1111 110R 1.0S .... .... 1000 ...0 .... */
-        size = extract32(insn, 20, 1);
-        rot = extract32(insn, 24, 1);
+        int size = extract32(insn, 20, 1);
+        data = extract32(insn, 24, 1); /* rot */
         if (!arm_dc_feature(s, ARM_FEATURE_V8_FCMA)
             || (!size && !arm_dc_feature(s, ARM_FEATURE_V8_FP16))) {
             return 1;
         }
         fn_gvec_ptr = size ? gen_helper_gvec_fcadds : gen_helper_gvec_fcaddh;
+    } else if ((insn & 0xfeb00f00) == 0xfc200d00) {
+        /* V[US]DOT -- 1111 1100 0.10 .... .... 1101 .Q.U .... */
+        bool u = extract32(insn, 4, 1);
+        if (!arm_dc_feature(s, ARM_FEATURE_V8_DOTPROD)) {
+            return 1;
+        }
+        fn_gvec = u ? gen_helper_gvec_udot_b : gen_helper_gvec_sdot_b;
     } else {
         return 1;
     }
@@ -7807,12 +7815,19 @@ static int disas_neon_insn_3same_ext(DisasContext *s, uint32_t insn)
     }
 
     opr_sz = (1 + q) * 8;
-    fpst = get_fpstatus_ptr(1);
-    tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd),
-                       vfp_reg_offset(1, rn),
-                       vfp_reg_offset(1, rm), fpst,
-                       opr_sz, opr_sz, rot, fn_gvec_ptr);
-    tcg_temp_free_ptr(fpst);
+    if (fn_gvec_ptr) {
+        TCGv_ptr fpst = get_fpstatus_ptr(1);
+        tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd),
+                           vfp_reg_offset(1, rn),
+                           vfp_reg_offset(1, rm), fpst,
+                           opr_sz, opr_sz, data, fn_gvec_ptr);
+        tcg_temp_free_ptr(fpst);
+    } else {
+        tcg_gen_gvec_3_ool(vfp_reg_offset(1, rd),
+                           vfp_reg_offset(1, rn),
+                           vfp_reg_offset(1, rm),
+                           opr_sz, opr_sz, data, fn_gvec);
+    }
     return 0;
 }
 
@@ -7826,9 +7841,9 @@ static int disas_neon_insn_3same_ext(DisasContext *s, uint32_t insn)
 
 static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)
 {
-    gen_helper_gvec_3_ptr *fn_gvec_ptr;
+    gen_helper_gvec_3 *fn_gvec = NULL;
+    gen_helper_gvec_3_ptr *fn_gvec_ptr = NULL;
     int rd, rn, rm, opr_sz, data;
-    TCGv_ptr fpst;
     bool q;
 
     q = extract32(insn, 6, 1);
@@ -7862,6 +7877,16 @@ static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)
         data = (index << 2) | rot;
         fn_gvec_ptr = (size ? gen_helper_gvec_fcmlas_idx
                        : gen_helper_gvec_fcmlah_idx);
+    } else if ((insn & 0xffb00f00) == 0xfe200d00) {
+        /* V[US]DOT -- 1111 1110 0.10 .... .... 1101 .Q.U .... */
+        int u = extract32(insn, 4, 1);
+        if (!arm_dc_feature(s, ARM_FEATURE_V8_DOTPROD)) {
+            return 1;
+        }
+        fn_gvec = u ? gen_helper_gvec_udot_idx_b : gen_helper_gvec_sdot_idx_b;
+        /* rm is just Vm, and index is M.  */
+        data = extract32(insn, 5, 1); /* index */
+        rm = extract32(insn, 0, 4);
     } else {
         return 1;
     }
@@ -7876,12 +7901,19 @@ static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)
     }
 
     opr_sz = (1 + q) * 8;
-    fpst = get_fpstatus_ptr(1);
-    tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd),
-                       vfp_reg_offset(1, rn),
-                       vfp_reg_offset(1, rm), fpst,
-                       opr_sz, opr_sz, data, fn_gvec_ptr);
-    tcg_temp_free_ptr(fpst);
+    if (fn_gvec_ptr) {
+        TCGv_ptr fpst = get_fpstatus_ptr(1);
+        tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd),
+                           vfp_reg_offset(1, rn),
+                           vfp_reg_offset(1, rm), fpst,
+                           opr_sz, opr_sz, data, fn_gvec_ptr);
+        tcg_temp_free_ptr(fpst);
+    } else {
+        tcg_gen_gvec_3_ool(vfp_reg_offset(1, rd),
+                           vfp_reg_offset(1, rn),
+                           vfp_reg_offset(1, rm),
+                           opr_sz, opr_sz, data, fn_gvec);
+    }
     return 0;
 }