Commit 19062c16 authored by Richard Henderson's avatar Richard Henderson Committed by Peter Maydell
Browse files

target/arm: Ignore float_flag_input_denormal from fp_status_f16 



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: qemu-stable@nongnu.org (3.0.1)
Reported-by: default avatarLaurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: default avatarLaurent Desnogues <laurent.desnogues@gmail.com>
Tested-by: default avatarLaurent Desnogues <laurent.desnogues@gmail.com>
Message-id: 20180810193129.1556-3-richard.henderson@linaro.org
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 0b62159b

target/arm/helper.c

+5 −1
Original line number Diff line number Diff line
@@ -11312,9 +11312,13 @@ 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;

}