When FZ is set, input_denormal exceptions are recognized, but this does not happen with FZ16. The softfloat code has no way to distinguish these bits and will raise such exceptions into fp_status_f16.flags, so ignore them when computing the accumulated flags.
Cc: [email protected] (3.0.1) Reported-by: Laurent Desnogues <[email protected]> Signed-off-by: Richard Henderson <[email protected]> --- target/arm/helper.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/target/arm/helper.c b/target/arm/helper.c index 452d5e182a..61454a77ec 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -11314,9 +11314,13 @@ uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env) fpscr = (env->vfp.xregs[ARM_VFP_FPSCR] & 0xffc8ffff) | (env->vfp.vec_len << 16) | (env->vfp.vec_stride << 20); + i = get_float_exception_flags(&env->vfp.fp_status); i |= get_float_exception_flags(&env->vfp.standard_fp_status); - i |= get_float_exception_flags(&env->vfp.fp_status_f16); + /* FZ16 does not generate an input denormal exception. */ + i |= (get_float_exception_flags(&env->vfp.fp_status_f16) + & ~float_flag_input_denormal); + fpscr |= vfp_exceptbits_from_host(i); return fpscr; } -- 2.17.1
