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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] Improve optimization of X86ISD + FLAGS opcodes"
href="https://bugs.llvm.org/show_bug.cgi?id=37987">37987</a>
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<th>Summary</th>
<td>[X86] Improve optimization of X86ISD + FLAGS opcodes
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>llvm-dev@redking.me.uk
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<th>CC</th>
<td>andrea.dibiagio@gmail.com, craig.topper@gmail.com, lebedev.ri@gmail.com, llvm-bugs@lists.llvm.org, spatel+llvm@rotateright.com
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<p>
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<pre><a href="https://reviews.llvm.org/D48619">https://reviews.llvm.org/D48619</a> highlighted that we're not doing much to
optimize the ops once they are lowered to X86ISD + FLAGS opcodes:
// Arithmetic operations with FLAGS results.
ADD, SUB, ADC, SBB, SMUL,
INC, DEC, OR, XOR, AND,
We should at least manage basic constant folding, zero handling etc.</pre>
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