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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [PATCH 13/19] Add VSX ISA2.06 Multiply Add Instructions |
Date: | Fri, 25 Oct 2013 10:34:24 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 |
On 10/25/2013 10:20 AM, Peter Maydell wrote: > Are you sure that doing the arithmetic with the softfloat 128 bit > float operations doesn't set the inexact flag anywhere it > shouldn't? (ie where the intermediate product is not exact in > 128 bit format but the final result is exact in 64 or 32 bits). The 128 bit multiply cannot given an inexact, and I believe that if the 128 bit addition gives inexact then the 64-bit fma result would also have inexact. r~
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