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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Prefetch not supported"
href="http://llvm.org/bugs/show_bug.cgi?id=20692">20692</a>
</td>
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<tr>
<th>Summary</th>
<td>Prefetch not supported
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</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>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>nlewycky@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
; ModuleID = 'p.c' (aka. "void test(char *x) { __builtin_prefetch(x, 1); }")
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64--linux-gnu"
; Function Attrs: nounwind
define void @test(i8* nocapture %x) {
entry:
tail call void @llvm.prefetch(i8* %x, i32 1, i32 3, i32 1)
ret void
}
; Function Attrs: nounwind
declare void @llvm.prefetch(i8* nocapture, i32, i32, i32) nounwind
If you run that, you get:
nlewycky@ducttape:~$ llc p.ll
LLVM ERROR: Cannot select: 0x320f110: ch = Prefetch 0x31dd410, 0x320edf8,
0x320ef00, 0x320f008, 0x320ef00<ST1[%x]> [ORD=2] [ID=5]
0x320edf8: i64,ch = CopyFromReg 0x31dd410, 0x320ecf0 [ORD=1] [ID=4]
0x320ecf0: i64 = Register %vreg0 [ID=1]
0x320ef00: i32 = Constant<1> [ID=2]
0x320f008: i32 = Constant<3> [ID=3]
0x320ef00: i32 = Constant<1> [ID=2]
In function: test</pre>
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