diff options
| author | Aram Hăvărneanu <aram@mgk.ro> | 2014-05-30 12:28:01 +0200 |
|---|---|---|
| committer | Aram Hăvărneanu <aram@mgk.ro> | 2014-05-30 12:28:01 +0200 |
| commit | bf0d5c8abbe9d4e3a145df29bee8ef2758d01884 (patch) | |
| tree | 19a0ae52aab138503e959b78be3f1ed89bd72fc0 /sys/src/cmd/6l | |
| parent | 17d0dea87c80203aaf0199cb33dea0afc4a7f956 (diff) | |
6a, 6c, 6l: fix copy propagation
Without an explicit signal for a truncation, copy propagation will
sometimes propagate a 32-bit truncation and end up overwriting uses of
the original 64-bit value.
This was independently discovered and fixed in Go. See:
http://golang.org/issue/1315
https://codereview.appspot.com/6002043/
Thanks Charles Forsyth for tips and advice.
Diffstat (limited to 'sys/src/cmd/6l')
| -rw-r--r-- | sys/src/cmd/6l/optab.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/src/cmd/6l/optab.c b/sys/src/cmd/6l/optab.c index 133bb1d2f..c4243b6ca 100644 --- a/sys/src/cmd/6l/optab.c +++ b/sys/src/cmd/6l/optab.c @@ -772,6 +772,7 @@ Optab optab[] = { AMOVNTPS, yxr_ml, Pm, 0x2b }, { AMOVNTQ, ymr_ml, Pm, 0xe7 }, { AMOVQ, ymovq, Pw, 0x89,0x8b,0x31,0xc7,(00),0xb8,0xc7,(00),0x6f,0x7f,0x6e,0x7e,Pf2,0xd6,Pe,0xd6,Pe,0x6e,Pe,0x7e }, + { AMOVQL, yrl_ml, Px, 0x89 }, { AMOVQOZX, ymrxr, Pf3, 0xd6,0x7e }, { AMOVSB, ynone, Pb, 0xa4 }, { AMOVSD, yxmov, Pf2, 0x10,0x11 }, |