diff options
Diffstat (limited to 'target/sh4/op_helper.c')
-rw-r--r-- | target/sh4/op_helper.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/target/sh4/op_helper.c b/target/sh4/op_helper.c index 8513f38849..d798f239cf 100644 --- a/target/sh4/op_helper.c +++ b/target/sh4/op_helper.c @@ -406,6 +406,22 @@ float64 helper_fsqrt_DT(CPUSH4State *env, float64 t0) return t0; } +float32 helper_fsrra_FT(CPUSH4State *env, float32 t0) +{ + set_float_exception_flags(0, &env->fp_status); + /* "Approximate" 1/sqrt(x) via actual computation. */ + t0 = float32_sqrt(t0, &env->fp_status); + t0 = float32_div(float32_one, t0, &env->fp_status); + /* Since this is supposed to be an approximation, an imprecision + exception is required. One supposes this also follows the usual + IEEE rule that other exceptions take precidence. */ + if (get_float_exception_flags(&env->fp_status) == 0) { + set_float_exception_flags(float_flag_inexact, &env->fp_status); + } + update_fpscr(env, GETPC()); + return t0; +} + float32 helper_fsub_FT(CPUSH4State *env, float32 t0, float32 t1) { set_float_exception_flags(0, &env->fp_status); |