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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Using -Os on i686: Assertion failed: (Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP register!"), function getFPReg"
href="https://llvm.org/bugs/show_bug.cgi?id=26625">26625</a>
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<th>Summary</th>
<td>Using -Os on i686: Assertion failed: (Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP register!"), function getFPReg
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This assertion only fires when targeting the i386 architecture, with a CPU
'below' pentium4, e.g. i486 through i686, and in combination with -Os. Neither
-O1 nor -O2 trigger the assertion.
Reduced testcase.c:
float sqrtf(float);
float x0;
void x1(void) { x0 = sqrtf(x0); }
Compile with:
clang -cc1 -triple i686 -emit-obj -Os testcase.c
Results in:
Assertion failed: (Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP
register!"), function getFPReg, file
/share/dim/src/llvm/trunk/lib/Target/X86/X86FloatingPoint.cpp, line 289.
Abort trap</pre>
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</p>
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