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Re: [Qemu-devel] [PATCH 02/14] Add various NaN-handling macros
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH 02/14] Add various NaN-handling macros |
Date: |
Tue, 3 Feb 2009 20:41:14 +0100 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Thu, Jan 22, 2009 at 12:44:02PM -0800, Nathan Froyd wrote:
> These simplify the implementation of the floating-point Altivec
> instructions and reduce clutter.
>
> Signed-off-by: Nathan Froyd <address@hidden>
> ---
> target-ppc/op_helper.c | 21 +++++++++++++++++++++
> 1 files changed, 21 insertions(+), 0 deletions(-)
>
> diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
> index d531dd8..9820040 100644
> --- a/target-ppc/op_helper.c
> +++ b/target-ppc/op_helper.c
> @@ -1965,6 +1965,23 @@ target_ulong helper_dlmzb (target_ulong high,
> target_ulong low, uint32_t update_
> for (index = ARRAY_SIZE(r->element)-1; index >= 0; index--)
> #endif
>
> +/* If X is a NaN, store the corresponding QNaN into RESULT. Otherwise,
> + * execute the following block. */
> +#define DO_HANDLE_NAN(result, x) \
> + if (float32_is_nan(x) || float32_is_signaling_nan(x)) { \
> + CPU_FloatU __f; \
> + __f.f = x; \
> + __f.l = __f.l | (1 << 22); /* Set QNaN bit. */ \
> + result = __f.f; \
> + } else
> +
> +#define HANDLE_NAN1(result, x) \
> + DO_HANDLE_NAN(result, x)
> +#define HANDLE_NAN2(result, x, y) \
> + DO_HANDLE_NAN(result, x) DO_HANDLE_NAN(result, y)
> +#define HANDLE_NAN3(result, x, y, z) \
> + DO_HANDLE_NAN(result, x) DO_HANDLE_NAN(result, y) DO_HANDLE_NAN(result,
> z)
> +
> /* Saturating arithmetic helpers. */
> #define SATCVT(from, to, from_type, to_type, min, max, use_min, use_max) \
> static always_inline to_type cvt##from##to (from_type x, int *sat) \
> @@ -2808,6 +2825,10 @@ VUPK(lsh, s32, s16, UPKLO)
> #undef UPKHI
> #undef UPKLO
>
> +#undef DO_HANDLE_NAN
> +#undef HANDLE_NAN1
> +#undef HANDLE_NAN2
> +#undef HANDLE_NAN3
> #undef VECTOR_FOR_INORDER_I
> #undef HI_IDX
> #undef LO_IDX
This is something already handled by the softfloat code. You should use
set_default_nan_mode(1, &env->vec_status) to get this behavior. This
could probably done directly in the init code.
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
- Re: [Qemu-devel] [PATCH 02/14] Add various NaN-handling macros,
Aurelien Jarno <=