softfloat: Define misc operations for bfloat16

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200813071421.2509-4-zhiwei_liu@c-sky.com>
[rth: Fix merge conflict with NO_SIGNALING_NANS; use bool for predicates.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index dc4ea33c09..c2f87addb2 100644
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -266,6 +266,25 @@ bool float16_is_quiet_nan(float16 a_, float_status *status)
 }
 
 /*----------------------------------------------------------------------------
+| Returns 1 if the bfloat16 value `a' is a quiet
+| NaN; otherwise returns 0.
+*----------------------------------------------------------------------------*/
+
+bool bfloat16_is_quiet_nan(bfloat16 a_, float_status *status)
+{
+    if (no_signaling_nans(status)) {
+        return bfloat16_is_any_nan(a_);
+    } else {
+        uint16_t a = a_;
+        if (snan_bit_is_one(status)) {
+            return (((a >> 6) & 0x1FF) == 0x1FE) && (a & 0x3F);
+        } else {
+            return ((a >> 6) & 0x1FF) == 0x1FF;
+        }
+    }
+}
+
+/*----------------------------------------------------------------------------
 | Returns 1 if the half-precision floating-point value `a' is a signaling
 | NaN; otherwise returns 0.
 *----------------------------------------------------------------------------*/
@@ -285,6 +304,25 @@ bool float16_is_signaling_nan(float16 a_, float_status *status)
 }
 
 /*----------------------------------------------------------------------------
+| Returns 1 if the bfloat16 value `a' is a signaling
+| NaN; otherwise returns 0.
+*----------------------------------------------------------------------------*/
+
+bool bfloat16_is_signaling_nan(bfloat16 a_, float_status *status)
+{
+    if (no_signaling_nans(status)) {
+        return 0;
+    } else {
+        uint16_t a = a_;
+        if (snan_bit_is_one(status)) {
+            return ((a >> 6) & 0x1FF) == 0x1FF;
+        } else {
+            return (((a >> 6) & 0x1FF) == 0x1FE) && (a & 0x3F);
+        }
+    }
+}
+
+/*----------------------------------------------------------------------------
 | Returns 1 if the single-precision floating-point value `a' is a quiet
 | NaN; otherwise returns 0.
 *----------------------------------------------------------------------------*/