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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [i965] Downward causes GPU hangs and misrendering on Haswell"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104297#c41">Comment # 41</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [i965] Downward causes GPU hangs and misrendering on Haswell"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104297">bug 104297</a>
from <span class="vcard"><a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> <span class="fn">Kenneth Graunke</span></a>
</span></b>
<pre>Check out the resulting assembly:
mov(8) g22<1>UD 0x00000000UD { align1 WE_all
1Q compacted };
mov(1) g22.5<1>UD 0x0000ff00UD { align1 WE_all
1N };
mov(2) g22<1>UD g0<0,1,0>UD { align1 WE_all
1N };
mov(2) g22.3<1>UD g15<4,1,0>UD { align1 WE_all
1N };
mov(8) g125<1>UD g0<4>UD { align16
WE_all 1Q };
mov(1) g126<1>UD 0x00000000UD { align1 WE_all
1N compacted };
mov(1) g126.4<1>UD 0x00000001UD { align1 WE_all
1N compacted };
mov(8) g127<1>D g22<4>D { align16 1Q };
send(8) null<1>UW g125<0>.xF 0x060a80fd
data MsgDesc: ( DC OWORD dual block write, 253, 0)
mlen 3 rlen 0 { align16 1Q };
g22 is a message header produced by a series of WE_all instructions. It's then
copied to g127 without WE_all set, which will only copy some of the channels.
It's then partially spilled and later partially reloaded. Guessing that's
your bug. I'll leave it to you.</pre>
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