Make the frnd function round according to the C 'round' spec

I don't know if this is correct as I don't have access to the ARC V3
specification, but if GCC is correct and QEMU is wrong, then the fdrnd
(and fsrnd) functions are supposed to round with ties rounding away
from zero, just like the C round and roundf functions.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

target/arc/fpu-helper-v3.c

@@ -173,13 +173,35 @@ CONVERSION_HELPERS(fuint2s, uint32_to_float32)
 CONVERSION_HELPERS(fs2uint, float32_to_uint32)
 CONVERSION_HELPERS(fs2uint_rz, float32_to_uint32_round_to_zero)
 
-CONVERSION_HELPERS(fdrnd, float64_round_to_int)
-CONVERSION_HELPERS(fsrnd, float32_round_to_int)
-
 CONVERSION_HELPERS(fdsqrt, float64_sqrt)
 CONVERSION_HELPERS(fssqrt, float32_sqrt)
 CONVERSION_HELPERS(fhsqrt, float16_sqrt)
 
+/* Soft fpu helper for round_to_int with rounding away mode */
+#define CONVERSION_HELPERS_RA(NAME, FLT_HELPER)                       \
+uint64_t helper_##NAME(CPUARCState *env, uint64_t src)                \
+{                                                                     \
+    FloatRoundMode saved_rounding_mode;                               \
+    bool saved_flush_zero;                                            \
+                                                                      \
+    saved_flush_zero = get_flush_to_zero(&env->fp_status);            \
+    saved_rounding_mode = get_float_rounding_mode(&env->fp_status);   \
+                                                                      \
+    set_flush_to_zero(true, &env->fp_status);                         \
+    set_float_rounding_mode(float_round_ties_away, &env->fp_status);  \
+                                                                      \
+    uint64_t ret = FLT_HELPER(src, &env->fp_status);                  \
+                                                                      \
+    set_flush_to_zero(saved_flush_zero, &env->fp_status);             \
+    set_float_rounding_mode(saved_rounding_mode, &env->fp_status);    \
+                                                                      \
+    check_fpu_raise_exception(env);                                   \
+    return ret;                                                       \
+}
+
+CONVERSION_HELPERS_RA(fdrnd, float64_round_to_int)
+CONVERSION_HELPERS_RA(fsrnd, float32_round_to_int)
+
 /* Soft fpu helper for round_to_int with rounding to zero mode */
 #define CONVERSION_HELPERS_RZ(NAME, FLT_HELPER)                       \
 uint64_t helper_##NAME(CPUARCState *env, uint64_t src)                \