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Re: [Qemu-devel] [PATCH] target-mips: silence NaNs for cvt.s.d and cvt.d
From: |
Maciej W. Rozycki |
Subject: |
Re: [Qemu-devel] [PATCH] target-mips: silence NaNs for cvt.s.d and cvt.d.s |
Date: |
Sun, 24 Jan 2016 03:42:43 +0000 (GMT) |
User-agent: |
Alpine 2.20 (LFD 67 2015-01-07) |
On Sun, 6 Dec 2015, Aurelien Jarno wrote:
> cvt.s.d and cvt.d.s are FP operations and thus need to convert input
> sNaN into corresponding qNaN. Explicitely use the floatXX_maybe_silence_nan
> functions for that as the floatXX_to_floatXX functions do not do that.
>
> Cc: Leon Alrae <address@hidden>
> Signed-off-by: Aurelien Jarno <address@hidden>
> ---
> target-mips/op_helper.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
> index d2c98c9..20e79be 100644
> --- a/target-mips/op_helper.c
> +++ b/target-mips/op_helper.c
> @@ -2545,6 +2545,7 @@ uint64_t helper_float_cvtd_s(CPUMIPSState *env,
> uint32_t fst0)
> uint64_t fdt2;
>
> fdt2 = float32_to_float64(fst0, &env->active_fpu.fp_status);
> + fdt2 = float64_maybe_silence_nan(fdt2);
> update_fcr31(env, GETPC());
> return fdt2;
> }
> @@ -2634,6 +2635,7 @@ uint32_t helper_float_cvts_d(CPUMIPSState *env,
> uint64_t fdt0)
> uint32_t fst2;
>
> fst2 = float64_to_float32(fdt0, &env->active_fpu.fp_status);
> + fst2 = float32_maybe_silence_nan(fst2);
> update_fcr31(env, GETPC());
> return fst2;
> }
FYI, I posted a more general fix to this a while ago, however the review
regrettably went nowhere. See the archive of discussion starting at:
<http://lists.nongnu.org/archive/html/qemu-devel/2014-12/msg00969.html>
for details, including the justification and further design consideration.
Maciej
- Re: [Qemu-devel] [PATCH] target-mips: silence NaNs for cvt.s.d and cvt.d.s,
Maciej W. Rozycki <=