[PATCH v2 23/26] softfloat: Implement float128_(min|minnum|minnummag|max|maxnum|maxnummag)

[David Hildenbrand <david@redhat.com>]

With Richard's softfloat rework, the float128 implementation is
straight-forward. Unfortuantely, we don't have any tests we can simply
adjust/unlock.

Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: "Alex Bennée" <alex.bennee@linaro.org>
Cc: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 fpu/softfloat.c         | 17 +++++++++++++++++
 include/fpu/softfloat.h |  6 ++++++
 2 files changed, 23 insertions(+)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 7376b3470c..bfe5a6b975 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -3893,6 +3893,22 @@ static float64 float64_minmax(float64 a, float64 b, float_status *s, int flags)
     return which ? b : a;
 }
 
+static float128 float128_minmax(float128 a, float128 b, float_status *s,
+                                int flags)
+{
+    FloatParts128 pa, pb;
+    int which;
+
+    float128_unpack_canonical(&pa, a, s);
+    float128_unpack_canonical(&pb, b, s);
+    which = parts_minmax(&pa, &pb, s, flags, &float64_params);
+    if (unlikely(which < 0)) {
+        /* Some sort of nan, need to repack default and silenced nans. */
+        return float128_round_pack_canonical(&pa, s);
+    }
+    return which ? b : a;
+}
+
 #define MINMAX_1(type, name, flags) \
     type type##_##name(type a, type b, float_status *s) \
     { return type##_minmax(a, b, s, flags); }
@@ -3909,6 +3925,7 @@ MINMAX_2(float16)
 MINMAX_2(bfloat16)
 MINMAX_2(float32)
 MINMAX_2(float64)
+MINMAX_2(float128)
 
 #undef MINMAX_1
 #undef MINMAX_2
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 94f7841b9f..ec7dca0960 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -1204,6 +1204,12 @@ float128 float128_rem(float128, float128, float_status *status);
 float128 float128_sqrt(float128, float_status *status);
 FloatRelation float128_compare(float128, float128, float_status *status);
 FloatRelation float128_compare_quiet(float128, float128, float_status *status);
+float128 float128_min(float128, float128, float_status *status);
+float128 float128_max(float128, float128, float_status *status);
+float128 float128_minnum(float128, float128, float_status *status);
+float128 float128_maxnum(float128, float128, float_status *status);
+float128 float128_minnummag(float128, float128, float_status *status);
+float128 float128_maxnummag(float128, float128, float_status *status);
 bool float128_is_quiet_nan(float128, float_status *status);
 bool float128_is_signaling_nan(float128, float_status *status);
 float128 float128_silence_nan(float128, float_status *status);
-- 
2.31.1