Set the default NaN pattern explicitly for loongarch.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241202131347.498124-42-peter.maydell@linaro.org
---
 target/loongarch/tcg/fpu_helper.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/loongarch/tcg/fpu_helper.c b/target/loongarch/tcg/fpu_helper.c
index aea5e0fe5e6..a83acf64b08 100644
--- a/target/loongarch/tcg/fpu_helper.c
+++ b/target/loongarch/tcg/fpu_helper.c
@@ -38,6 +38,8 @@ void restore_fp_status(CPULoongArchState *env)
      */
     set_float_infzeronan_rule(float_infzeronan_dnan_never, &env->fp_status);
     set_float_3nan_prop_rule(float_3nan_prop_s_cab, &env->fp_status);
+    /* Default NaN: sign bit clear, msb frac bit set */
+    set_float_default_nan_pattern(0b01000000, &env->fp_status);
 }
 
 int ieee_ex_to_loongarch(int xcpt)
-- 
2.34.1