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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PowerPC64: Simple floating point code hits machine verifier failure"
href="https://llvm.org/bugs/show_bug.cgi?id=27718">27718</a>
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<th>Summary</th>
<td>PowerPC64: Simple floating point code hits machine verifier failure
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>anton@samba.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following testcase:
void fn1(void) { float a = 1; }
when built with:
clang -c -O0 -mllvm -verify-machineinstrs /tmp/testcase.c
hits a machine verifier failure:
# After Instruction Selection
# Machine code for function fn1: Properties: <>
Frame Objects:
fi#0: size=4, align=4, at location [SP]
Constant Pool:
cp#0: 1.000000e+00, align=4
BB#0: derived from LLVM BB %0
%vreg1<def> = ADDIStocHA %X2, <cp#0>; G8RC_and_G8RC_NOX0:%vreg1
%vreg0<def> = LFS <cp#0>[TF=112], %vreg1; mem:LD4[ConstantPool]
VSSRC:%vreg0 G8RC_and_G8RC_NOX0:%vreg1
%vreg2<def> = LIS 16256; GPRC:%vreg2
STW %vreg2<kill>, 0, <fi#0>; mem:ST4[%1] GPRC:%vreg2
BLR8 %LR8<imp-use>, %RM<imp-use>
# End machine code for function fn1.
*** Bad machine code: Illegal virtual register for instruction ***
- function: fn1
- basic block: BB#0 (0x1000ef8b780)
- instruction: %vreg0<def> = LFS
- operand 0: %vreg0<def>
Expected a F4RC register, but got a VSSRC register
fatal error: error in backend: Found 1 machine code errors.</pre>
</div>
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