target/s390x: implement COMPARE AND SIGNAL

These functions differ from COMPARE by generating an exception for a
QNaN input. Use the non quiet version of floatXX_compare.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Message-Id: <20170531220129.27724-10-aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>

4 files changed, 57 insertions, 0 deletions

diff --git a/target/s390x/fpu_helper.c b/target/s390x/fpu_helper.c
index e604e9f..26f124f 100644
--- a/target/s390x/fpu_helper.c
+++ b/target/s390x/fpu_helper.c
@@ -585,6 +585,33 @@ uint64_t HELPER(fixb)(CPUS390XState *env, uint64_t ah, uint64_t al, uint32_t m3)
     return RET128(ret);
 }
 
+/* 32-bit FP compare and signal */
+uint32_t HELPER(keb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
+{
+    int cmp = float32_compare(f1, f2, &env->fpu_status);
+    handle_exceptions(env, GETPC());
+    return float_comp_to_cc(env, cmp);
+}
+
+/* 64-bit FP compare and signal */
+uint32_t HELPER(kdb)(CPUS390XState *env, uint64_t f1, uint64_t f2)
+{
+    int cmp = float64_compare(f1, f2, &env->fpu_status);
+    handle_exceptions(env, GETPC());
+    return float_comp_to_cc(env, cmp);
+}
+
+/* 128-bit FP compare and signal */
+uint32_t HELPER(kxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
+                     uint64_t bh, uint64_t bl)
+{
+    int cmp = float128_compare(make_float128(ah, al),
+                               make_float128(bh, bl),
+                               &env->fpu_status);
+    handle_exceptions(env, GETPC());
+    return float_comp_to_cc(env, cmp);
+}
+
 /* 32-bit FP multiply and add */
 uint64_t HELPER(maeb)(CPUS390XState *env, uint64_t f1,
                       uint64_t f2, uint64_t f3)
diff --git a/target/s390x/helper.h b/target/s390x/helper.h
index c6fbc3b..86e2bc1 100644
--- a/target/s390x/helper.h
+++ b/target/s390x/helper.h
@@ -49,6 +49,9 @@ DEF_HELPER_FLAGS_3(lexb, TCG_CALL_NO_WG, i64, env, i64, i64)
 DEF_HELPER_FLAGS_3(ceb, TCG_CALL_NO_WG_SE, i32, env, i64, i64)
 DEF_HELPER_FLAGS_3(cdb, TCG_CALL_NO_WG_SE, i32, env, i64, i64)
 DEF_HELPER_FLAGS_5(cxb, TCG_CALL_NO_WG_SE, i32, env, i64, i64, i64, i64)
+DEF_HELPER_FLAGS_3(keb, TCG_CALL_NO_WG, i32, env, i64, i64)
+DEF_HELPER_FLAGS_3(kdb, TCG_CALL_NO_WG, i32, env, i64, i64)
+DEF_HELPER_FLAGS_5(kxb, TCG_CALL_NO_WG, i32, env, i64, i64, i64, i64)
 DEF_HELPER_FLAGS_3(cgeb, TCG_CALL_NO_WG, i64, env, i64, i32)
 DEF_HELPER_FLAGS_3(cgdb, TCG_CALL_NO_WG, i64, env, i64, i32)
 DEF_HELPER_FLAGS_4(cgxb, TCG_CALL_NO_WG, i64, env, i64, i64, i32)
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index f92bfde..39fcce5 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -154,6 +154,12 @@
     C(0xb349, CXBR,    RRE,   Z,   x1_o, x2_o, 0, 0, cxb, 0)
     C(0xed09, CEB,     RXE,   Z,   e1, m2_32u, 0, 0, ceb, 0)
     C(0xed19, CDB,     RXE,   Z,   f1_o, m2_64, 0, 0, cdb, 0)
+/* COMPARE AND SIGNAL */
+    C(0xb308, KEBR,    RRE,   Z,   e1, e2, 0, 0, keb, 0)
+    C(0xb318, KDBR,    RRE,   Z,   f1_o, f2_o, 0, 0, kdb, 0)
+    C(0xb348, KXBR,    RRE,   Z,   x1_o, x2_o, 0, 0, kxb, 0)
+    C(0xed08, KEB,     RXE,   Z,   e1, m2_32u, 0, 0, keb, 0)
+    C(0xed18, KDB,     RXE,   Z,   f1_o, m2_64, 0, 0, kdb, 0)
 /* COMPARE IMMEDIATE */
     C(0xc20d, CFI,     RIL_a, EI,  r1, i2, 0, 0, 0, cmps32)
     C(0xc20c, CGFI,    RIL_a, EI,  r1, i2, 0, 0, 0, cmps64)
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index b3cc349..0a35eed 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -2374,6 +2374,27 @@ static ExitStatus op_iske(DisasContext *s, DisasOps *o)
 }
 #endif
 
+static ExitStatus op_keb(DisasContext *s, DisasOps *o)
+{
+    gen_helper_keb(cc_op, cpu_env, o->in1, o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_kdb(DisasContext *s, DisasOps *o)
+{
+    gen_helper_kdb(cc_op, cpu_env, o->in1, o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
+static ExitStatus op_kxb(DisasContext *s, DisasOps *o)
+{
+    gen_helper_kxb(cc_op, cpu_env, o->out, o->out2, o->in1, o->in2);
+    set_cc_static(s);
+    return NO_EXIT;
+}
+
 static ExitStatus op_laa(DisasContext *s, DisasOps *o)
 {
     /* The real output is indeed the original value in memory;