s390x/tcg: Implement VECTOR FP COMPARE (AND SIGNAL) SCALAR

As far as I can see, there is only a tiny difference.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>

4 files changed, 59 insertions, 0 deletions

diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index 21658a2..d34d680 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -252,6 +252,8 @@ DEF_HELPER_6(gvec_vstrc_cc_rt32, void, ptr, cptr, cptr, cptr, env, i32)
 /* === Vector Floating-Point Instructions */
 DEF_HELPER_FLAGS_5(gvec_vfa64, TCG_CALL_NO_WG, void, ptr, cptr, cptr, env, i32)
 DEF_HELPER_FLAGS_5(gvec_vfa64s, TCG_CALL_NO_WG, void, ptr, cptr, cptr, env, i32)
+DEF_HELPER_4(gvec_wfc64, void, cptr, cptr, env, i32)
+DEF_HELPER_4(gvec_wfk64, void, cptr, 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 79892f6..c45e101 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -1208,6 +1208,10 @@
 
 /* VECTOR FP ADD */
     F(0xe7e3, VFA,     VRR_c, V,   0, 0, 0, 0, vfa, 0, IF_VEC)
+/* VECTOR FP COMPARE SCALAR */
+    F(0xe7cb, WFC,     VRR_a, V,   0, 0, 0, 0, wfc, 0, IF_VEC)
+/* VECTOR FP COMPARE AND SIGNAL SCALAR */
+    F(0xe7ca, WFK,     VRR_a, V,   0, 0, 0, 0, wfc, 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 44da9f2..283e8aa 100644
--- a/target/s390x/translate_vx.inc.c
+++ b/target/s390x/translate_vx.inc.c
@@ -2567,3 +2567,24 @@ static DisasJumpType op_vfa(DisasContext *s, DisasOps *o)
                    get_field(s->fields, v3), cpu_env, 0, fn);
     return DISAS_NEXT;
 }
+
+static DisasJumpType op_wfc(DisasContext *s, DisasOps *o)
+{
+    const uint8_t fpf = get_field(s->fields, m3);
+    const uint8_t m4 = get_field(s->fields, m4);
+
+    if (fpf != FPF_LONG || m4) {
+        gen_program_exception(s, PGM_SPECIFICATION);
+        return DISAS_NORETURN;
+    }
+
+    if (s->fields->op2 == 0xcb) {
+        gen_gvec_2_ptr(get_field(s->fields, v1), get_field(s->fields, v2),
+                       cpu_env, 0, gen_helper_gvec_wfc64);
+    } else {
+        gen_gvec_2_ptr(get_field(s->fields, v1), get_field(s->fields, v2),
+                       cpu_env, 0, gen_helper_gvec_wfk64);
+    }
+    set_cc_static(s);
+    return DISAS_NEXT;
+}
diff --git a/target/s390x/vec_fpu_helper.c b/target/s390x/vec_fpu_helper.c
index c7db079..f9357d9 100644
--- a/target/s390x/vec_fpu_helper.c
+++ b/target/s390x/vec_fpu_helper.c
@@ -117,3 +117,35 @@ void HELPER(gvec_vfa64s)(void *v1, const void *v2, const void *v3,
 {
     vop64_3(v1, v2, v3, env, true, vfa64, GETPC());
 }
+
+static int wfc64(const S390Vector *v1, const S390Vector *v2,
+                 CPUS390XState *env, bool signal, uintptr_t retaddr)
+{
+    /* only the zero-indexed elements are compared */
+    const float64 a = s390_vec_read_element64(v1, 0);
+    const float64 b = s390_vec_read_element64(v2, 0);
+    uint8_t vxc, vec_exc = 0;
+    int cmp;
+
+    if (signal) {
+        cmp = float64_compare(a, b, &env->fpu_status);
+    } else {
+        cmp = float64_compare_quiet(a, b, &env->fpu_status);
+    }
+    vxc = check_ieee_exc(env, 0, false, &vec_exc);
+    handle_ieee_exc(env, vxc, vec_exc, retaddr);
+
+    return float_comp_to_cc(env, cmp);
+}
+
+void HELPER(gvec_wfc64)(const void *v1, const void *v2, CPUS390XState *env,
+                        uint32_t desc)
+{
+    env->cc_op = wfc64(v1, v2, env, false, GETPC());
+}
+
+void HELPER(gvec_wfk64)(const void *v1, const void *v2, CPUS390XState *env,
+                        uint32_t desc)
+{
+    env->cc_op = wfc64(v1, v2, env, true, GETPC());
+}