Set the default NaN pattern explicitly for m68k.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-43-peter.maydell@linaro.org
---
 target/m68k/cpu.c              | 2 ++
 fpu/softfloat-specialize.c.inc | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/target/m68k/cpu.c b/target/m68k/cpu.c
index 13b76e22488..9de8ce67078 100644
--- a/target/m68k/cpu.c
+++ b/target/m68k/cpu.c
@@ -105,6 +105,8 @@ static void m68k_cpu_reset_hold(Object *obj, ResetType type)
      * preceding paragraph for nonsignaling NaNs.
      */
     set_float_2nan_prop_rule(float_2nan_prop_ab, &env->fp_status);
+    /* Default NaN: sign bit clear, all frac bits set */
+    set_float_default_nan_pattern(0b01111111, &env->fp_status);
 
     nan = floatx80_default_nan(&env->fp_status);
     for (i = 0; i < 8; i++) {
diff --git a/fpu/softfloat-specialize.c.inc b/fpu/softfloat-specialize.c.inc
index b5ec1944d15..ecb7a52ae7c 100644
--- a/fpu/softfloat-specialize.c.inc
+++ b/fpu/softfloat-specialize.c.inc
@@ -136,7 +136,7 @@ static void parts64_default_nan(FloatParts64 *p, float_status *status)
     uint8_t dnan_pattern = status->default_nan_pattern;
 
     if (dnan_pattern == 0) {
-#if defined(TARGET_SPARC) || defined(TARGET_M68K)
+#if defined(TARGET_SPARC)
         /* Sign bit clear, all frac bits set */
         dnan_pattern = 0b01111111;
 #elif defined(TARGET_HEXAGON)
-- 
2.34.1