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<body><span class="vcard"><a class="email" href="mailto:sroland@vmware.com" title="sroland@vmware.com">sroland@vmware.com</a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Mesa llvmpipe piglit gl-3.2-layered-rendering-gl-layer regression"
href="https://llvm.org/bugs/show_bug.cgi?id=23424">bug 23424</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Mesa llvmpipe piglit gl-3.2-layered-rendering-gl-layer regression"
href="https://llvm.org/bugs/show_bug.cgi?id=23424#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Mesa llvmpipe piglit gl-3.2-layered-rendering-gl-layer regression"
href="https://llvm.org/bugs/show_bug.cgi?id=23424">bug 23424</a>
from <span class="vcard"><a class="email" href="mailto:sroland@vmware.com" title="sroland@vmware.com">sroland@vmware.com</a>
</span></b>
<pre>Ahh this is indeed a bug in mesa with an out-of-bounds index, I'll fix that.
It did not show up in the IR because whenever we dump the IR the out-of-bound
index is already optimized away... At least I don't know of any way to dump the
"raw" IR (we just do a LLVMDumpValue() on the function) which is actually
something I missed before :-(.
(It did show up as a difference to the old IR though, previously it was saying
%0 = insertelement <4 x i32> undef, i32 %num_prims, i32 0
%1 = shufflevector <4 x i32> %0, <4 x i32> undef, <4 x i32> zeroinitializer
%2 = icmp sgt <4 x i32> %1, <i32 0, i32 1, i32 2, i32 3>
whereas now it was
%0 = insertelement <4 x i32> undef, i32 %num_prims, i32 0
%1 = shufflevector <4 x i32> %0, <4 x i32> undef, <4 x i32> zeroinitializer
%2 = icmp sgt <4 x i32> %1, undef
)
That 0/1/2/3 vec4 was initialized with elements/indices ranging from 0-4
before.</pre>
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