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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Move some literal constants to push constants"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87661">87661</a>
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<th>Summary</th>
<td>Move some literal constants to push constants
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/DRI/i965
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<th>Assignee</th>
<td>idr@freedesktop.org
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<th>Reporter</th>
<td>idr@freedesktop.org
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<th>Blocks</th>
<td>77547
</td>
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<p>
<div>
<pre>I have observed a shader that generates code like this:
mov(16) g17<1>F 0.321569F { align1 1H };
cmp.ge.f0(16) g15<1>D -g10<8,8,1>F 0F { align1 1H };
and.nz.f0(16) null g15<8,8,1>D 1D { align1 1H
compacted };
mov(16) g19<1>F 0.498039F { align1 1H };
mov(16) g21<1>F 0.223529F { align1 1H };
mov(16) g23<1>F 1F { align1 1H };
(-f0) sel(16) g120<1>F g17<8,8,1>F 0.12549F { align1 1H };
(-f0) sel(16) g122<1>F g19<8,8,1>F 0.27451F { align1 1H };
(-f0) sel(16) g124<1>F g21<8,8,1>F 0.192157F { align1 1H };
(-f0) sel(16) g126<1>F g23<8,8,1>F 0F { align1 1H };
If one set of literal constants were moved to push constants, we could save 4
instructions. The entire shader in question was only 15 instructions, so that
would be worthwhile for that case. In other cases it may be more problematic.</pre>
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