[PATCH v4 18/26] s390x/tcg: Implement 128 bit for VECTOR FP LOAD ROUNDED

[David Hildenbrand <david@redhat.com>]

128 bit -> 64 bit, there is only a single element to process.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 target/s390x/helper.h           |  1 +
 target/s390x/translate_vx.c.inc | 11 ++++++++++-
 target/s390x/vec_fpu_helper.c   | 19 +++++++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index b5ba159402..02e6967ae6 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -287,6 +287,7 @@ DEF_HELPER_FLAGS_4(gvec_vfi128, 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_vfll64, 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_vflr128, TCG_CALL_NO_WG, void, ptr, cptr, env, i32)
 DEF_HELPER_FLAGS_5(gvec_vfm32, TCG_CALL_NO_WG, void, ptr, cptr, cptr, env, i32)
 DEF_HELPER_FLAGS_5(gvec_vfm64, TCG_CALL_NO_WG, void, ptr, cptr, cptr, env, i32)
 DEF_HELPER_FLAGS_5(gvec_vfm128, TCG_CALL_NO_WG, void, ptr, cptr, cptr, env, i32)
diff --git a/target/s390x/translate_vx.c.inc b/target/s390x/translate_vx.c.inc
index 472afca45e..e94c9f9d86 100644
--- a/target/s390x/translate_vx.c.inc
+++ b/target/s390x/translate_vx.c.inc
@@ -2759,8 +2759,17 @@ static DisasJumpType op_vcdg(DisasContext *s, DisasOps *o)
         }
         break;
     case 0xc5:
-        if (fpf == FPF_LONG) {
+        switch (fpf) {
+        case FPF_LONG:
             fn = gen_helper_gvec_vflr64;
+            break;
+        case FPF_EXT:
+            if (s390_has_feat(S390_FEAT_VECTOR_ENH)) {
+                fn = gen_helper_gvec_vflr128;
+            }
+            break;
+        default:
+            break;
         }
         break;
     default:
diff --git a/target/s390x/vec_fpu_helper.c b/target/s390x/vec_fpu_helper.c
index 75e3212582..0fb82bd18f 100644
--- a/target/s390x/vec_fpu_helper.c
+++ b/target/s390x/vec_fpu_helper.c
@@ -563,6 +563,25 @@ void HELPER(gvec_vflr64)(void *v1, const void *v2, CPUS390XState *env,
     *(S390Vector *)v1 = tmp;
 }
 
+void HELPER(gvec_vflr128)(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);
+    uint8_t vxc, vec_exc = 0;
+    int old_mode;
+    float64 ret;
+
+    old_mode = s390_swap_bfp_rounding_mode(env, erm);
+    ret = float128_to_float64(s390_vec_read_float128(v2), &env->fpu_status);
+    vxc = check_ieee_exc(env, 0, XxC, &vec_exc);
+    s390_restore_bfp_rounding_mode(env, old_mode);
+    handle_ieee_exc(env, vxc, vec_exc, GETPC());
+
+    /* place at even element, odd element is unpredictable */
+    s390_vec_write_float64(v1, 0, ret);
+}
+
 static void vfma64(S390Vector *v1, const S390Vector *v2, const S390Vector *v3,
                    const S390Vector *v4, CPUS390XState *env, bool s, int flags,
                    uintptr_t retaddr)
-- 
2.31.1