<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [NVPTX] llc error on select with llvm.ptx.read.* TargetConstant"
href="http://llvm.org/bugs/show_bug.cgi?id=22322">22322</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[NVPTX] llc error on select with llvm.ptx.read.* TargetConstant
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: PTX
</td>
</tr>
<tr>
<th>Assignee</th>
<td>justin.holewinski@gmail.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>florian.ziesche+llvm@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13728" name="attach_13728" title="the error producing .ll file">attachment 13728</a> <a href="attachment.cgi?id=13728&action=edit" title="the error producing .ll file">[details]</a></span>
the error producing .ll file
when compiling the attached .ll or .cpp file to ptx, llc errors with:
LLVM ERROR: Cannot select: 0x1a61188: i1 = setcc 0x1a60d68, 0x1a60b58,
0x1a61080 [ORD=15] [ID=30]
0x1a60d68: f32 = select 0x1a60a50, 0x1a60b58, 0x1a60c60 [ORD=13] [ID=27]
0x1a60a50: i1 = setcc 0x1a60738, 0x1a60840, 0x1a60948 [ORD=12] [ID=25]
0x1a60738: i32 = and 0x1a5f358, 0x1a60630 [ORD=11] [ID=23]
0x1a5f358: i32 = NVPTXISD::IMAD 0x1a5ee30, 0x1a5ec20, 0x1a5f148 [ORD=7]
[ID=22]
0x1a5ee30: i32 = llvm.ptx.read.ntid.x 0x1a5ed28 [ORD=4] [ID=19]
0x1a5ed28: i64 = TargetConstant<3016> [ID=4]
0x1a5ec20: i32 = llvm.ptx.read.ctaid.x 0x1a5eb18 [ORD=3] [ID=18]
0x1a5eb18: i64 = TargetConstant<3000> [ID=3]
0x1a5f148: i32 = llvm.ptx.read.tid.x 0x1a5f040 [ORD=6] [ID=20]
0x1a5f040: i64 = TargetConstant<3026> [ID=5]
0x1a60630: i32 = Constant<15> [ID=8]
0x1a60840: i32 = Constant<0> [ID=9]
0x1a60b58: f32 = ConstantFP<0.000000e+00> [ID=11]
0x1a60c60: f32 = ConstantFP<-1.000000e+00> [ID=12]
0x1a60b58: f32 = ConstantFP<0.000000e+00> [ID=11]
In function: some_kernel
Steps to Reproduce:
using the .ll file: cat ptx_select_error.ll | llc -mcpu=sm_30
using the .cpp file: clang++ -x cuda -std=cuda -target nvptx64-nvidia-cuda
-Xclang -fcuda-is-device -Ofast -emit-llvm -S -o - ptx_select_error.cpp | llc
-mcpu=sm_30
some notes:
* neither the sm_xx target nor the bitness matter here
* I've confirmed this bug with clang/llvm 3.5.0 on OS X, 3.5.1 on Linux and 3.6
rc1 on OS X
* compiling the .cpp file in any other -O mode than -Ofast results in an .ll
file that llc has no problems with (then again, even with -O3 it's about twice
as long and there are still branch instructions)
* the problematic select instruction is "%9 = select i1 %8, float 0.000000e+00,
float -1.000000e+00"</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>