{"action":"opened","issue":{"url":"https://api.github.com/repos/dyninst/dyninst/issues/198","repository_url":"https://api.github.com/repos/dyninst/dyninst","labels_url":"https://api.github.com/repos/dyninst/dyninst/issues/198/labels{/name}","comments_url":"https://api.github.com/repos/dyninst/dyninst/issues/198/comments","events_url":"https://api.github.com/repos/dyninst/dyninst/issues/198/events","html_url":"https://github.com/dyninst/dyninst/issues/198","id":183085312,"number":198,"title":"Opcode suffixes do not take into account prefix bytes","user":{"login":"nathanhjay","id":12011651,"avatar_url":"https://avatars.githubusercontent.com/u/12011651?v=3","gravatar_id":"","url":"https://api.github.com/users/nathanhjay","html_url":"https://github.com/nathanhjay","followers_url":"https://api.github.com/users/nathanhjay/followers","following_url":"https://api.github.com/users/nathanhjay/following{/other_user}","gists_url":"https://api.github.com/users/nathanhjay/gists{/gist_id}","starred_url":"https://api.github.com/users/nathanhjay/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nathanhjay/subscriptions","organizations_url":"https://api.github.com/users/nathanhjay/orgs","repos_url":"https://api.github.com/users/nathanhjay/repos","events_url":"https://api.github.com/users/nathanhjay/events{/privacy}","received_events_url":"https://api.github.com/users/nathanhjay/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-10-14T15:51:30Z","updated_at":"2016-10-14T15:51:30Z","closed_at":null,"body":"I think we're not changing the suffix of sbb when it is prefixed.\r\n\r\nOn sbb, we use the 'l' prefix with %rax. The l-prefix should only be used for 64 bits in the case of floating point instructions, according to the rules imposed by gas.\r\nBytes: 4a 83 d8 f4\r\nDyninst Output: sbbl $0xfffffffffffffff4,%rax\r\n\r\nWe also use the 'l' prefix with %bp for sbb, which isn't correct. \r\nBytes: 66 83 dd c0\r\nDyninst Output: sbbl $0xc0,%bp"}}
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