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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Add support for X86ISD float2int constant folding"
href="https://bugs.llvm.org/show_bug.cgi?id=37798">37798</a>
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<th>Summary</th>
<td>[X86] Add support for X86ISD float2int constant folding
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
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<th>CC</th>
<td>andrea.dibiagio@gmail.com, craig.topper@gmail.com, filcab@gmail.com, greg.bedwell@sony.com, lebedev.ri@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<th>Depends on</th>
<td>37751
</td>
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<p>
<div>
<pre>Split off from [<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] CVTTPD2DQ/CVTTPS2DQ intrinsics must not map to ISD::FP_TO_SINT etc."
href="show_bug.cgi?id=37751">Bug #37751</a>].
Now that we've standardised to using X86ISD opcodes for float2int conversions:
// Vector float/double to signed/unsigned integer.
CVTP2SI, CVTP2UI, CVTP2SI_RND, CVTP2UI_RND,
// Scalar float/double to signed/unsigned integer.
CVTS2SI_RND, CVTS2UI_RND,
// Vector float/double to signed/unsigned integer with truncation.
CVTTP2SI, CVTTP2UI, CVTTP2SI_RND, CVTTP2UI_RND,
// Scalar float/double to signed/unsigned integer with truncation.
CVTTS2SI_RND, CVTTS2UI_RND,
We should investigate adding safe constant folding support to these. We could
at least support exact conversions (these should be rounding mode independent
for non-truncation instructions?).
For truncation instructions we can probably accept inexact conversions as well,
as long as no underflow/overflow occurs - this would need to be tested to
confirm.</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] CVTTPD2DQ/CVTTPS2DQ intrinsics must not map to ISD::FP_TO_SINT etc."
href="https://bugs.llvm.org/show_bug.cgi?id=37751">Bug 37751</a>] [X86] CVTTPD2DQ/CVTTPS2DQ intrinsics must not map to ISD::FP_TO_SINT etc.
</li>
</ul>
</div>
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