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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [PATCH 6/6] Do constant folding for unary operations. |
Date: | Fri, 20 May 2011 11:39:11 -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.fc14 Thunderbird/3.1.10 |
On 05/20/2011 05:39 AM, Kirill Batuzov wrote: > + case INDEX_op_ext8s_i64: > + return x & (1 << 7) ? x | ~0xffULL : x & 0xff; > + > + case INDEX_op_ext16s_i64: > + return x & (1 << 15) ? x | ~0xffffULL : x & 0xffff; > + > + case INDEX_op_ext32s_i64: > + return x & (1U << 31) ? x | ~0xffffffffULL : x & 0xffffffff; Likewise for letting the compiler help with appropriate casts. r~
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