From: Richard Henderson <richard.henderson@linaro.org>
To: Taylor Simpson <tsimpson@quicinc.com>, qemu-devel@nongnu.org
Cc: ale@rev.ng, bcain@quicinc.com, philmd@redhat.com
Subject: Re: [PATCH 09/15] Hexagon (target/hexagon) use softfloat for float-to-int conversions
Date: Thu, 25 Mar 2021 10:17:46 -0600 [thread overview]
Message-ID: <3c38b7c8-0658-aec3-9bcf-38bbb3983f50@linaro.org> (raw)
In-Reply-To: <4dca7e06-0782-90dc-c058-b4249193a616@linaro.org>
On 3/25/21 10:09 AM, Richard Henderson wrote:
> On 3/24/21 8:50 PM, Taylor Simpson wrote:
>> @@ -451,16 +456,28 @@ int32_t HELPER(conv_sf2w)(CPUHexagonState *env, float32
>> RsV)
>> {
>> int32_t RdV;
>> arch_fpop_start(env);
>> - RdV = conv_sf_to_4s(RsV, &env->fp_status);
>> + /* Hexagon returns -1 for NaN */
>> + if (float32_is_any_nan(RsV)) {
>> + float_raise(float_flag_invalid, &env->fp_status);
>> + RdV = -1;
>> + } else {
>> + RdV = float32_to_int32(RsV, &env->fp_status);
>> + }
>
> So this is interesting.
>
> The 8.3.x Document Bundle, which has the V67 programmer's manual, say the
> output value is IMPLEMENTATION DEFINED (without saying anything more about
> defining values for any particular implementation), while the older 2010 manual
> specifies 0x7fffffff as the result (which is what float32_to_int32 provides).
OMG, I had the wrong manual open. Ignore me.
r~
next prev parent reply other threads:[~2021-03-25 16:19 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 2:49 [PATCH 00/15] Hexagon (target/hexagon) update Taylor Simpson
2021-03-25 2:49 ` [PATCH 01/15] Hexagon (target/hexagon) TCG generation cleanup Taylor Simpson
2021-03-25 12:56 ` Richard Henderson
2021-03-25 2:49 ` [PATCH 02/15] Hexagon (target/hexagon) remove unnecessary inline directives Taylor Simpson
2021-03-25 13:02 ` Richard Henderson
2021-03-25 2:49 ` [PATCH 03/15] Hexagon (target/hexagon) properly generate TB end for DISAS_NORETURN Taylor Simpson
2021-03-25 14:38 ` Richard Henderson
2021-03-25 2:49 ` [PATCH 04/15] Hexagon (target/hexagon) decide if pred has been written at TCG gen time Taylor Simpson
2021-03-25 14:42 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 05/15] Hexagon (target/hexagon) change variables from int to bool when appropriate Taylor Simpson
2021-03-25 9:35 ` Philippe Mathieu-Daudé
2021-03-25 14:44 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 06/15] Hexagon (target/hexagon) utility function changes Taylor Simpson
2021-03-25 14:45 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 07/15] Hexagon (target/hexagon) use softfloat default NaN and tininess Taylor Simpson
2021-03-25 14:54 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 08/15] Hexagon (target/hexagon) replace float32_mul_pow2 with float32_scalbn Taylor Simpson
2021-03-25 14:55 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 09/15] Hexagon (target/hexagon) use softfloat for float-to-int conversions Taylor Simpson
2021-03-25 16:09 ` Richard Henderson
2021-03-25 16:17 ` Richard Henderson [this message]
2021-03-25 2:50 ` [PATCH 10/15] Hexagon (target/hexagon) instructions with multiple definitions Taylor Simpson
2021-03-25 16:24 ` Richard Henderson
2021-03-29 21:55 ` Taylor Simpson
2021-03-25 2:50 ` [PATCH 11/15] Hexagon (target/hexagon) circular addressing Taylor Simpson
2021-03-25 16:33 ` Richard Henderson
2021-03-25 17:37 ` Taylor Simpson
2021-03-25 2:50 ` [PATCH 12/15] Hexagon (target/hexagon) bit reverse (brev) addressing Taylor Simpson
2021-03-25 16:38 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 13/15] Hexagon (target/hexagon) load and unpack bytes instructions Taylor Simpson
2021-03-25 2:50 ` [PATCH 14/15] Hexagon (target/hexagon) load into shifted register instructions Taylor Simpson
2021-03-25 16:44 ` Richard Henderson
2021-03-25 2:50 ` [PATCH 15/15] Hexagon (target/hexagon) CABAC decode bin Taylor Simpson
2021-03-25 16:54 ` Richard Henderson
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