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target/arm: Ignore float_flag_input_denormal from fp_status_f16

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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.

Backports commit 19062c169e5bcdda3d60df9161228e107bf0f96e from qemu
This commit is contained in:
Richard Henderson 2018-08-17 14:03:38 -04:00 committed by Lioncash
parent f787dd15fd
commit 15a68a354c
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 1 deletions
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5
qemu/target/arm/helper.c
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@ -10554,9 +10554,12 @@ 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;
}