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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SimplifyLibCalls (in -instcombine) modifies all basic blocks in all functions in all modules"
href="https://llvm.org/bugs/show_bug.cgi?id=26993">26993</a>
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<th>Summary</th>
<td>SimplifyLibCalls (in -instcombine) modifies all basic blocks in all functions in all modules
</td>
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<th>Product</th>
<td>libraries
</td>
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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
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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
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<th>Component</th>
<td>Transformation Utilities
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>dexonsmith@apple.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Consider the following code:
--
define double @a() {
%sin = call double @__sinpi(double 1.0)
ret double %sin
}
define double @b() {
%cos = call double @__cospi(double 1.0)
ret double %cos
}
declare double @__sinpi(double %x) #0
declare double @__cospi(double %x) #0
attributes #0 = { readnone nounwind }
--
Run -instcombine with r263853:
--
$ opt -instcombine -S -mtriple=x86_64-apple-macosx10.9
Instruction does not dominate all uses!
%cospi = extractvalue { double, double } %sincospi, 1
ret double %cospi
LLVM ERROR: Broken function found, compilation aborted!
--
The problem is that LibCallSimplifier::optimizeSinCosPi looks at all uses of
the constant. This will affect not just other functions, but also all other
modules in the context.
I'm not sure -instcombine is even supposed to modify other basic blocks?</pre>
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