{"action":"created","issue":{"url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite/issues/893","repository_url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite","labels_url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite/issues/893/labels{/name}","comments_url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite/issues/893/comments","events_url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite/issues/893/events","html_url":"https://github.com/jb-alvarado/media-autobuild_suite/issues/893","id":349423125,"node_id":"MDU6SXNzdWUzNDk0MjMxMjU=","number":893,"title":"aomenc (MinGW64, GCC 8.2.0) crashes, Tree SLP vectorization bug?","user":{"login":"LigH-de","id":5917225,"node_id":"MDQ6VXNlcjU5MTcyMjU=","avatar_url":"https://avatars3.githubusercontent.com/u/5917225?v=4","gravatar_id":"","url":"https://api.github.com/users/LigH-de","html_url":"https://github.com/LigH-de","followers_url":"https://api.github.com/users/LigH-de/followers","following_url":"https://api.github.com/users/LigH-de/following{/other_user}","gists_url":"https://api.github.com/users/LigH-de/gists{/gist_id}","starred_url":"https://api.github.com/users/LigH-de/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/LigH-de/subscriptions","organizations_url":"https://api.github.com/users/LigH-de/orgs","repos_url":"https://api.github.com/users/LigH-de/repos","events_url":"https://api.github.com/users/LigH-de/events{/privacy}","received_events_url":"https://api.github.com/users/LigH-de/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":7,"created_at":"2018-08-10T08:30:58Z","updated_at":"2018-08-12T17:33:58Z","closed_at":"2018-08-11T20:02:46Z","author_association":"NONE","body":"MSYS2 recently updated MinGW64 with GCC 8.2.0; since then, aomenc crashes while encoding in second pass.\r\n\r\n[aomedia issue 2055](https://bugs.chromium.org/p/aomedia/issues/detail?id=2055) – Segmentation fault when encoding (introduced by \"Remove code about dev speed features\")\r\nSummary: `So it looks like -ftree-slp-vectorize is the culprit here`\r\n\r\nBetter wait if Alexpux downgrades GCC back to 7.3.0, or try to disable vectorization using a flag?"},"comment":{"url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite/issues/comments/412358861","html_url":"https://github.com/jb-alvarado/media-autobuild_suite/issues/893#issuecomment-412358861","issue_url":"https://api.github.com/repos/jb-alvarado/media-autobuild_suite/issues/893","id":412358861,"node_id":"MDEyOklzc3VlQ29tbWVudDQxMjM1ODg2MQ==","user":{"login":"LigH-de","id":5917225,"node_id":"MDQ6VXNlcjU5MTcyMjU=","avatar_url":"https://avatars3.githubusercontent.com/u/5917225?v=4","gravatar_id":"","url":"https://api.github.com/users/LigH-de","html_url":"https://github.com/LigH-de","followers_url":"https://api.github.com/users/LigH-de/followers","following_url":"https://api.github.com/users/LigH-de/following{/other_user}","gists_url":"https://api.github.com/users/LigH-de/gists{/gist_id}","starred_url":"https://api.github.com/users/LigH-de/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/LigH-de/subscriptions","organizations_url":"https://api.github.com/users/LigH-de/orgs","repos_url":"https://api.github.com/users/LigH-de/repos","events_url":"https://api.github.com/users/LigH-de/events{/privacy}","received_events_url":"https://api.github.com/users/LigH-de/received_events","type":"User","site_admin":false},"created_at":"2018-08-12T17:33:58Z","updated_at":"2018-08-12T17:33:58Z","author_association":"NONE","body":"Still, it's an interesting case for the compiler developers: The reason for the crash appears to be aligned vs. unaligned memory access, so the final fix may eventually have to be implemented in the vectorization code generation.\r\n\r\nThere is a temporary patch for aomenc in issue 2055, reordering instructions in shuffle functions to avoid this issue."}}
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