target/xtensa: Set default NaN pattern explicitly

Set the default NaN pattern explicitly for xtensa.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-51-peter.maydell@linaro.org

diff --git a/target/xtensa/cpu.c b/target/xtensa/cpu.c
index 3163b758235db80758585d00adf0ca4ae1f6c2e8..0d4d79b58b43ba2425af21682c00bbd518dfc7d6 100644 (file)
--- a/target/xtensa/cpu.c
+++ b/target/xtensa/cpu.c
@@ -136,6 +136,8 @@ static void xtensa_cpu_reset_hold(Object *obj, ResetType type)
     /* For inf * 0 + NaN, return the input NaN */
     set_float_infzeronan_rule(float_infzeronan_dnan_never, &env->fp_status);
     set_no_signaling_nans(!dfpu, &env->fp_status);
+    /* Default NaN value: sign bit clear, set frac msb */
+    set_float_default_nan_pattern(0b01000000, &env->fp_status);
     xtensa_use_first_nan(env, !dfpu);
 }