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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Using SSE4 instructions for roundl() cause test failure in Android."
href="https://bugs.llvm.org/show_bug.cgi?id=45722">45722</a>
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<th>Summary</th>
<td>[X86] Using SSE4 instructions for roundl() cause test failure in Android.
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<th>Product</th>
<td>new-bugs
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>yabinc@google.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
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<pre>With patch <a href="https://reviews.llvm.org/D73607">https://reviews.llvm.org/D73607</a> ([X86] Custom lower ISD::FROUND with
SSE4.1 to avoid a libcall), we have a problem to pass a test in Android.
The test is TEST(MATH_TEST, roundl) in
<a href="https://android.googlesource.com/platform/bionic/+/refs/heads/master/tests/math_test.cpp#1224">https://android.googlesource.com/platform/bionic/+/refs/heads/master/tests/math_test.cpp#1224</a>.
The problem is: with the LLVM patch, roundl(0.5L) is replace by SSE
instructions when building for 32-bit tests on x86_64. And SSE instructions are
affected by round mode set by fesetround(FE_TOWARDZERO), and makes roundl(0.5L)
=> 0.
I am not sure where we should fix this (Android bionic libc or llvm). So create
this bug to ask for help.</pre>
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