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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Piglit shaders@ssa@fs-if-def-else-break fails with sb but passes with R600_DEBUG=nosb"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101442">101442</a>
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<th>Summary</th>
<td>Piglit shaders@ssa@fs-if-def-else-break fails with sb but passes with R600_DEBUG=nosb
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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/Gallium/r600
</td>
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<tr>
<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gw.fossdev@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>The piglit test
shaders@ssa@fs-if-def-else-break
fails with only with sb enabled but passes without it.
The relevant parts of the failing shader before and after optimization look
like this:
===== SHADER #12 ====================================== PS/BARTS/EVERGREEN
=====
===== 90 dw ===== 9 gprs ===== 2 stack ==================================
[...]
0060 801f00fe 0100229c 6 MP x: PRED_SETNE_INT R8.x, PV.x, 0
0018 0000000b 82800000 JUMP @22
0020 0000001f a00c0000 ALU 4 @62
0062 000000f8 00200c90 7 x: MOV R1.x, 0 <----
0064 000004f9 20200c90 y: MOV R1.y, 1.0 <----
0066 000000f8 40200c90 z: MOV R1.z, 0
0068 800004f9 60200c90 w: MOV R1.w, 1.0
0022 0000000d 83400001 ELSE @26 POP:1
0024 00000023 a80c0000 ALU_POP_AFTER 4 @70
0070 000004f9 00200c90 8 x: MOV R1.x, 1.0 <----
0072 000000f8 20200c90 y: MOV R1.y, 0 <----
0074 000000f8 40200c90 z: MOV R1.z, 0
0076 800004f9 60200c90 w: MOV R1.w, 1.0
0026 40000027 a4040000 ALU_PUSH_BEFORE 2 @78 KC0[CB0:0-15]
0078 80000081 00801990 9 x: NOT_INT R4.x, KC0[1].x
0080 801f00fe 0100229c 10 MP x: PRED_SETNE_INT R8.x, PV.x, 0
0028 00000011 82800001 JUMP @34 POP:1
0030 00000011 82400000 LOOP_BREAK @34
0032 00000011 83800001 POP @34 POP:1
0034 00000002 81400000 LOOP_END @4
0036 00000029 a00c0000 ALU 4 @82
0082 00000001 00000c90 11 x: MOV R0.x, R1.x
0084 00000401 20000c90 y: MOV R0.y, R1.y
0086 00000801 40000c90 z: MOV R0.z, R1.z
0088 80000c01 60000c90 w: MOV R0.w, R1.w
0038 c0000000 95200688 EXPORT_DONE PIXEL 0 R0.xyzw EOP
===== SHADER_END
===============================================================
===== SHADER #12 OPT ================================== PS/BARTS/EVERGREEN
=====
===== 50 dw ===== 1 gprs ===== 2 stack
=========================================
[...]
0040 801f0800 00002284 3 M x: PRED_SETNE_INT __.x, R0.z, 0
0018 0000000d 82800001 JUMP @26 POP:1
0020 00000015 a0040000 ALU 2 @42
0042 000000f9 00000c90 4 x: MOV R0.x, 1.0 <-----
0044 800000f8 20000c90 y: MOV R0.y, 0 <-----
0022 0000000e 82400000 LOOP_BREAK @28
0024 0000000d 83800001 POP @26 POP:1
0026 00000017 a0040000 ALU 2 @46
0046 000000f9 00000c90 5 x: MOV R0.x, 1.0 <-----
0048 800000f8 20000c90 y: MOV R0.y, 0 <-----
0028 00000002 81400000 LOOP_END @4
0030 c0000000 95200a44 EXPORT_DONE PIXEL 0 R0.0xy1 EOP
===== SHADER_END
===============================================================
In short after the optimization R0.xy get the same values assigned in both
decision paths.
Best,
Gert</pre>
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