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From: | Richard Henderson |
Subject: | Re: [Qemu-devel] [RFC v3 PATCH 14/14] target-i386: Generate fences for x86 |
Date: | Fri, 17 Jun 2016 22:48:27 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 |
On 06/17/2016 09:03 PM, Pranith Kumar wrote:
case 0xe8 ... 0xef: /* lfence */ + tcg_gen_mb(TCG_MO_LD_LD | TCG_BAR_SC); + break; case 0xf0 ... 0xf7: /* mfence */ if (!(s->cpuid_features & CPUID_SSE2) || (prefixes & PREFIX_LOCK)) { goto illegal_op; } + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
You need to duplicate the sse2 check if you split lfence from mfence. r~
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