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Re: [Qemu-devel] [PATCH 6/7] target-tricore: Add cmp.f instruction


From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 6/7] target-tricore: Add cmp.f instruction
Date: Tue, 8 Mar 2016 10:37:31 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 03/08/2016 10:11 AM, Bastian Koppelmann wrote:
On 03/08/2016 03:42 PM, Richard Henderson wrote:
On 03/08/2016 05:20 AM, Bastian Koppelmann wrote:
On 03/01/2016 07:21 PM, Richard Henderson wrote:
On 03/01/2016 08:24 AM, Bastian Koppelmann wrote:
+
+    lt = float32_lt_quiet(arg1, arg2, &env->fp_status);
+    eq = float32_eq_quiet(arg1, arg2, &env->fp_status);
+    uo = float32_unordered(arg1, arg2, &env->fp_status);

Do it in one step with float32_compare.
You don't want _quiet; see below re psw_flags.

Unfortunately, if I don't use _quiet my tests fail against real
hardware...

Fail in what way?  I don't think _quiet computes all of the bits you need.

Also as far as I see the softfloat implementation, _quiet only
determines whether an invalid exception is raised if the inputs are any
nans or just signaling nans.


You're right -- I mis-read the set_FI status at the bottom of the page.


r~



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