2 files changed, 34 insertions, 0 deletions

diff --git a/include/fpu/softfloat-helpers.h b/include/fpu/softfloat-helpers.h
index 453188de70..0bf44dc608 100644
--- a/include/fpu/softfloat-helpers.h
+++ b/include/fpu/softfloat-helpers.h
@@ -81,6 +81,12 @@ static inline void set_float_2nan_prop_rule(Float2NaNPropRule rule,
     status->float_2nan_prop_rule = rule;
 }
 
+static inline void set_float_infzeronan_rule(FloatInfZeroNaNRule rule,
+                                             float_status *status)
+{
+    status->float_infzeronan_rule = rule;
+}
+
 static inline void set_flush_to_zero(bool val, float_status *status)
 {
     status->flush_to_zero = val;
@@ -137,6 +143,11 @@ static inline Float2NaNPropRule get_float_2nan_prop_rule(float_status *status)
     return status->float_2nan_prop_rule;
 }
 
+static inline FloatInfZeroNaNRule get_float_infzeronan_rule(float_status *status)
+{
+    return status->float_infzeronan_rule;
+}
+
 static inline bool get_flush_to_zero(float_status *status)
 {
     return status->flush_to_zero;
diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h
index 8f39691dfd..47bb22c4e2 100644
--- a/include/fpu/softfloat-types.h
+++ b/include/fpu/softfloat-types.h
@@ -208,6 +208,28 @@ typedef enum __attribute__((__packed__)) {
 } Float2NaNPropRule;
 
 /*
+ * Rule for result of fused multiply-add 0 * Inf + NaN.
+ * This must be a NaN, but implementations differ on whether this
+ * is the input NaN or the default NaN.
+ *
+ * You don't need to set this if default_nan_mode is enabled.
+ * When not in default-NaN mode, it is an error for the target
+ * not to set the rule in float_status if it uses muladd, and we
+ * will assert if we need to handle an input NaN and no rule was
+ * selected.
+ */
+typedef enum __attribute__((__packed__)) {
+    /* No propagation rule specified */
+    float_infzeronan_none = 0,
+    /* Result is never the default NaN (so always the input NaN) */
+    float_infzeronan_dnan_never,
+    /* Result is always the default NaN */
+    float_infzeronan_dnan_always,
+    /* Result is the default NaN if the input NaN is quiet */
+    float_infzeronan_dnan_if_qnan,
+} FloatInfZeroNaNRule;
+
+/*
  * Floating Point Status. Individual architectures may maintain
  * several versions of float_status for different functions. The
  * correct status for the operation is then passed by reference to
@@ -219,6 +241,7 @@ typedef struct float_status {
     FloatRoundMode float_rounding_mode;
     FloatX80RoundPrec floatx80_rounding_precision;
     Float2NaNPropRule float_2nan_prop_rule;
+    FloatInfZeroNaNRule float_infzeronan_rule;
     bool tininess_before_rounding;
     /* should denormalised results go to zero and set the inexact flag? */
     bool flush_to_zero;