target/arm: Replace ARM_FEATURE_VFP4 with isar_feature_aa32_simdfmac

All remaining tests for VFP4 are for fused multiply-add insns.

Since the MVFR1 field is used for both VFP and NEON, move its adjustment
from the !has_neon block to the (!has_vfp && !has_neon) block.

Test for vfp of the appropraite width alongside the test for simdfmac
within translate-vfp.inc.c.  Within disas_neon_data_insn, we have
already tested for ARM_FEATURE_NEON.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200224222232.13807-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 18 insertions, 4 deletions

diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c
index f88a95438f..03ba8d7aac 100644
--- a/target/arm/translate-vfp.inc.c
+++ b/target/arm/translate-vfp.inc.c
@@ -1803,11 +1803,18 @@ static bool trans_VFM_sp(DisasContext *s, arg_VFM_sp *a)
 
     /*
      * Present in VFPv4 only.
+     * Note that we can't rely on the SIMDFMAC check alone, because
+     * in a Neon-no-VFP core that ID register field will be non-zero.
+     */
+    if (!dc_isar_feature(aa32_simdfmac, s) ||
+        !dc_isar_feature(aa32_fpsp_v2, s)) {
+        return false;
+    }
+    /*
      * In v7A, UNPREDICTABLE with non-zero vector length/stride; from
      * v8A, must UNDEF. We choose to UNDEF for both v7A and v8A.
      */
-    if (!arm_dc_feature(s, ARM_FEATURE_VFP4) ||
-        (s->vec_len != 0 || s->vec_stride != 0)) {
+    if (s->vec_len != 0 || s->vec_stride != 0) {
         return false;
     }
 
@@ -1861,11 +1868,18 @@ static bool trans_VFM_dp(DisasContext *s, arg_VFM_dp *a)
 
     /*
      * Present in VFPv4 only.
+     * Note that we can't rely on the SIMDFMAC check alone, because
+     * in a Neon-no-VFP core that ID register field will be non-zero.
+     */
+    if (!dc_isar_feature(aa32_simdfmac, s) ||
+        !dc_isar_feature(aa32_fpdp_v2, s)) {
+        return false;
+    }
+    /*
      * In v7A, UNPREDICTABLE with non-zero vector length/stride; from
      * v8A, must UNDEF. We choose to UNDEF for both v7A and v8A.
      */
-    if (!arm_dc_feature(s, ARM_FEATURE_VFP4) ||
-        (s->vec_len != 0 || s->vec_stride != 0)) {
+    if (s->vec_len != 0 || s->vec_stride != 0) {
         return false;
     }