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[PULL,12/46] softfloat: fix return_nan vs default_nan_mode

Message ID 20210516123431.718318-13-richard.henderson@linaro.org
State Accepted
Commit 57547c6023344f4b4562d7cadb1799a31c8a4549
Headers show
Series softfloat: Convert float128 to FloatParts (part 1) | expand

Commit Message

Richard Henderson May 16, 2021, 12:33 p.m. UTC 
Do not call parts_silence_nan when default_nan_mode is in
effect.  This will avoid an assert in a later patch.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Reviewed-by: David Hildenbrand <david@redhat.com>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
 fpu/softfloat.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

-- 
2.25.1
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Patch

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index b694e38522..6589f00b23 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -892,21 +892,16 @@  static float64 float64_round_pack_canonical(FloatParts p, float_status *s)
 
 static FloatParts return_nan(FloatParts a, float_status *s)
 {
-    switch (a.cls) {
-    case float_class_snan:
+    g_assert(is_nan(a.cls));
+    if (is_snan(a.cls)) {
         float_raise(float_flag_invalid, s);
-        a = parts_silence_nan(a, s);
-        /* fall through */
-    case float_class_qnan:
-        if (s->default_nan_mode) {
-            return parts_default_nan(s);
+        if (!s->default_nan_mode) {
+            return parts_silence_nan(a, s);
         }
-        break;
-
-    default:
-        g_assert_not_reached();
+    } else if (!s->default_nan_mode) {
+        return a;
     }
-    return a;
+    return parts_default_nan(s);
 }
 
 static FloatParts pick_nan(FloatParts a, FloatParts b, float_status *s)