fpu: Remove use_first_nan field from float_status

The use_first_nan field in float_status was an xtensa-specific way to
select at runtime from two different NaN propagation rules.  Now that
xtensa is using the target-agnostic NaN propagation rule selection
that we've just added, we can remove use_first_nan, because there is
no longer any code that reads it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-27-peter.maydell@linaro.org

diff --git a/include/fpu/softfloat-helpers.h b/include/fpu/softfloat-helpers.h
index cf06b4e16bf1bf69392aec329e392ecf77d18d15..10a6763532cfce244f4c481285f24b5b76946408 100644 (file)
--- a/include/fpu/softfloat-helpers.h
+++ b/include/fpu/softfloat-helpers.h
@@ -113,11 +113,6 @@ static inline void set_snan_bit_is_one(bool val, float_status *status)
     status->snan_bit_is_one = val;
 }
 
-static inline void set_use_first_nan(bool val, float_status *status)
-{
-    status->use_first_nan = val;
-}
-
 static inline void set_no_signaling_nans(bool val, float_status *status)
 {
     status->no_signaling_nans = val;

diff --git a/include/fpu/softfloat-types.h b/include/fpu/softfloat-types.h
index d9f0797edafbd6c7248def3369dd475268402fe9..84ba4ed20e6a6864c4702aee0f632dedc6454e97 100644 (file)
--- a/include/fpu/softfloat-types.h
+++ b/include/fpu/softfloat-types.h
@@ -309,7 +309,6 @@ typedef struct float_status {
      * softfloat-specialize.inc.c)
      */
     bool snan_bit_is_one;
-    bool use_first_nan;
     bool no_signaling_nans;
     /* should overflowed results subtract re_bias to its exponent? */
     bool rebias_overflow;

diff --git a/target/xtensa/fpu_helper.c b/target/xtensa/fpu_helper.c
index 4b1b021d8241ab1e21c91504b8c0a449f293a149..53fc7cfd2af9abcf3baac61bb68bffd5b1d94a21 100644 (file)
--- a/target/xtensa/fpu_helper.c
+++ b/target/xtensa/fpu_helper.c
@@ -59,7 +59,6 @@ static const struct {
 
 void xtensa_use_first_nan(CPUXtensaState *env, bool use_first)
 {
-    set_use_first_nan(use_first, &env->fp_status);
     set_float_2nan_prop_rule(use_first ? float_2nan_prop_ab : float_2nan_prop_ba,
                              &env->fp_status);
     set_float_3nan_prop_rule(use_first ? float_3nan_prop_abc : float_3nan_prop_cba,