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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [PATCH 5/6] Do constant folding for shift operations. |
Date: | Fri, 27 May 2011 12:54:37 -0700 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10 |
On 05/27/2011 10:07 AM, Blue Swirl wrote: >> The C99 hook exists to efficiently support targets that don't have >> arithmetic shift operations. Honestly. > > So it would be impossible for a compiler developer to change the logic > for shifts for some supported two's-complement logic CPUs (like x86) > just because it's legal? Not without being lynched, no. r~
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