[Qemu-devel] [PATCH v1 14/23] s390x/tcg: Implement VECTOR LOAD ROUNDED

[David Hildenbrand <david@redhat.com>]

We can reuse some of the infrastructure introduced for
VECTOR FP CONVERT FROM FIXED 64-BIT and friends.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/helper.h           |  2 ++
 target/s390x/insn-data.def      |  2 ++
 target/s390x/translate_vx.inc.c |  3 +++
 target/s390x/vec_fpu_helper.c   | 43 +++++++++++++++++++++++++++++++++
 4 files changed, 50 insertions(+)

diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index cb25141ffe..7526f8e8c6 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -280,6 +280,8 @@ DEF_HELPER_FLAGS_4(gvec_vfi64, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
 DEF_HELPER_FLAGS_4(gvec_vfi64s, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
 DEF_HELPER_FLAGS_4(gvec_vfll32, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
 DEF_HELPER_FLAGS_4(gvec_vfll32s, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
+DEF_HELPER_FLAGS_4(gvec_vflr64, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
+DEF_HELPER_FLAGS_4(gvec_vflr64s, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
 
 #ifndef CONFIG_USER_ONLY
 DEF_HELPER_3(servc, i32, env, i64, i64)
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index 5afdb36aec..f03914d528 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -1232,6 +1232,8 @@
     F(0xe7c7, VFI,     VRR_a, V,   0, 0, 0, 0, vcdg, 0, IF_VEC)
 /* VECTOR LOAD LENGTHENED */
     F(0xe7c4, VFLL,    VRR_a, V,   0, 0, 0, 0, vfll, 0, IF_VEC)
+/* VECTOR LOAD ROUNDED */
+    F(0xe7c5, VFLR,    VRR_a, V,   0, 0, 0, 0, vcdg, 0, IF_VEC)
 
 #ifndef CONFIG_USER_ONLY
 /* COMPARE AND SWAP AND PURGE */
diff --git a/target/s390x/translate_vx.inc.c b/target/s390x/translate_vx.inc.c
index a25985e5c9..73e1b1062a 100644
--- a/target/s390x/translate_vx.inc.c
+++ b/target/s390x/translate_vx.inc.c
@@ -2672,6 +2672,9 @@ static DisasJumpType op_vcdg(DisasContext *s, DisasOps *o)
     case 0xc7:
         fn = se ? gen_helper_gvec_vfi64s : gen_helper_gvec_vfi64;
         break;
+    case 0xc5:
+        fn = se ? gen_helper_gvec_vflr64s : gen_helper_gvec_vflr64;
+        break;
     default:
         g_assert_not_reached();
     }
diff --git a/target/s390x/vec_fpu_helper.c b/target/s390x/vec_fpu_helper.c
index f8919beed5..d5fd931b61 100644
--- a/target/s390x/vec_fpu_helper.c
+++ b/target/s390x/vec_fpu_helper.c
@@ -448,3 +448,46 @@ void HELPER(gvec_vfll32s)(void *v1, const void *v2, CPUS390XState *env,
 {
     vfll32(v1, v2, env, true, GETPC());
 }
+
+static void vflr64(S390Vector *v1, const S390Vector *v2, CPUS390XState *env,
+                   bool s, bool XxC, uint8_t erm, uintptr_t retaddr)
+{
+    uint8_t vxc, vec_exc = 0;
+    S390Vector tmp = {};
+    int i, old_mode;
+
+    old_mode = s390_swap_bfp_rounding_mode(env, erm);
+    for (i = 0; i < 2; i++) {
+        float64 a = make_float64(s390_vec_read_element64(v2, i));
+        uint32_t ret = float32_val(float64_to_float32(a, &env->fpu_status));
+
+        /* place at even element */
+        s390_vec_write_element32(&tmp, i * 2, ret);
+        /* indicate the source element */
+        vxc = check_ieee_exc(env, i, XxC, &vec_exc);
+        if (s || vxc) {
+            break;
+        }
+    }
+    s390_restore_bfp_rounding_mode(env, old_mode);
+    handle_ieee_exc(env, vxc, vec_exc, retaddr);
+    *v1 = tmp;
+}
+
+void HELPER(gvec_vflr64)(void *v1, const void *v2, CPUS390XState *env,
+                         uint32_t desc)
+{
+    const uint8_t erm = extract32(simd_data(desc), 4, 4);
+    const bool XxC = extract32(simd_data(desc), 2, 1);
+
+    vflr64(v1, v2, env, false, XxC, erm, GETPC());
+}
+
+void HELPER(gvec_vflr64s)(void *v1, const void *v2, CPUS390XState *env,
+                          uint32_t desc)
+{
+    const uint8_t erm = extract32(simd_data(desc), 4, 4);
+    const bool XxC = extract32(simd_data(desc), 2, 1);
+
+    vflr64(v1, v2, env, true, XxC, erm, GETPC());
+}
-- 
2.20.1