[PATCH 06/11] target/rx: Handle the FPSW.DN bit in helper_set_fpsw

[Richard Henderson]

Both input and output denormals flush to zero when DN is set.

Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/rx/op_helper.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/target/rx/op_helper.c b/target/rx/op_helper.c
index ef904eb5f9..2139def3b2 100644
--- a/target/rx/op_helper.c
+++ b/target/rx/op_helper.c
@@ -127,13 +127,20 @@ void helper_set_fpsw(CPURXState *env, uint32_t val)
         float_round_down,
     };
     uint32_t fpsw = env->fpsw;
+    bool dn;
+
     fpsw |= 0x7fffff03;
     val &= ~0x80000000;
     fpsw &= val;
     FIELD_DP32(fpsw, FPSW, FS, FIELD_EX32(fpsw, FPSW, FLAGS) != 0);
     env->fpsw = fpsw;
-    set_float_rounding_mode(roundmode[FIELD_EX32(env->fpsw, FPSW, RM)],
+
+    set_float_rounding_mode(roundmode[FIELD_EX32(fpsw, FPSW, RM)],
                             &env->fp_status);
+
+    dn = FIELD_EX32(env->fpsw, FPSW, DN);
+    set_flush_to_zero(dn, &env->fp_status);
+    set_flush_inputs_to_zero(dn, &env->fp_status);
 }
 
 #define FLOATOP(op, func)                                           \
-- 
2.25.1