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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: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Message-id: 20180810193129.1556-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2018-08-16 14:05:29 +01:00 committed by Peter Maydell
parent 0b62159be3
commit 19062c169e
1 changed files with 5 additions and 1 deletions
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6
target/arm/helper.c
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@ -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;
}