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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - X86 FP Stackifier: Using an undefined physical register"
href="https://bugs.llvm.org/show_bug.cgi?id=39437">39437</a>
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<th>Summary</th>
<td>X86 FP Stackifier: Using an undefined physical register
</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>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>francisvm@yahoo.com
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>LLVM_ENABLE_MACHINE_VERIFIER=1 ./build/bin/llvm-lit -v -a
test/CodeGen/X86/avx512-regcall-NoMask.ll
# After X86 FP Stackifier
# Machine code for function test_CallargRetf80: NoPHIs, TracksLiveness, NoVRegs
Function Live Ins: $fp0
bb.0 (%ir-block.0):
ADD_FrST0 $st0
ADJCALLSTACKDOWN32 0, 0, 0, implicit-def dead $esp, implicit-def dead
$eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp
CALLpcrel32 @test_argRetf80, <regmask $bh $bl $bp $bph $bpl $bx $di $dih $dil
$ebp $ebx $edi $esi $esp $hbp $hbx $hdi $hsi $hsp $si $sih $sil $sp $sph $spl
$xmm4 $xmm5 $xmm6 $xmm7>, implicit $esp, implicit $ssp, implicit killed $fp0,
implicit-def $esp, implicit-def $ssp, implicit-def $fp0
ADJCALLSTACKUP32 0, 0, implicit-def dead $esp, implicit-def dead $eflags,
implicit-def dead $ssp, implicit $esp, implicit $ssp
ADD_FrST0 $st0
RET 0
# End machine code for function test_CallargRetf80.
*** Bad machine code: Using an undefined physical register ***
- function: test_CallargRetf80
- basic block: %bb.0 (0x7fae6500b478)
- instruction: CALLpcrel32 @test_argRetf80, <regmask $bh $bl $bp $bph $bpl $bx
$di $dih $dil $ebp $ebx $edi $esi $esp $hbp $hbx $hdi $hsi $hsp $si $sih $sil
$sp $sph $spl $xmm4 $xmm5 $xmm6 $xmm7>, implicit $esp, implicit $ssp, implicit
killed $fp0, implicit-def $esp, implicit-def $ssp, implicit-def $fp0
- operand 4: implicit killed $fp0
LLVM ERROR: Found 1 machine code errors.</pre>
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