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[x86-64 AVX] Look to replace <code>shift+AND</code> =&gt; <code>blend+shift</code>

backend:X86

missed-optimization

Status: Open.

#169830 In llvm/llvm-project;

· Validark opened on Nov 27, 2025

[x86-64] Allow branching on shl/shr setting zero flag

backend:X86

missed-optimization

Status: Open.

#168867 In llvm/llvm-project;

· Validark opened on Nov 20, 2025

[Intel] Failure to shift-in one bits via <code>shld</code>

backend:X86

missed-optimization

Status: Open.

#168862 In llvm/llvm-project;

· Validark opened on Nov 20, 2025

[x86] Eliminate <code>movzx</code> when upper part of register is irrelevant or overwritten

backend:X86

good first issuehttps://github.com/llvm/llvm-project/contributehttps://github.com/llvm/llvm-project/contribute

llvm:SelectionDAGSelectionDAGISel as wellSelectionDAGISel as well

missed-optimization

Status: Open.

#168828 In llvm/llvm-project;

· Validark opened on Nov 20, 2025

<code>xor+seta+add =&gt; cmp+sbb</code> transform fails when source is <code>a+b+1</code>

llvm:optimizations

Status: Open.

#165544 In llvm/llvm-project;

· Validark opened on Oct 29, 2025

[AVX-512] Look for vector bit rotates on vectors larger than 16 bytes

good first issuehttps://github.com/llvm/llvm-project/contributehttps://github.com/llvm/llvm-project/contribute

llvm:instcombineCovers the InstCombine, InstSimplify and AggressiveInstCombine passesCovers the InstCombine, InstSimplify and AggressiveInstCombine passes

missed-optimization

Status: Open.

#165306 In llvm/llvm-project;

· Validark opened on Oct 27, 2025

<code>~a &amp; ~b &amp; ~c</code> should not compile to <code>~(a | b | c)</code>

llvm:SelectionDAGSelectionDAGISel as wellSelectionDAGISel as well

missed-optimization

Status: Open.

#163516 In llvm/llvm-project;

· Validark opened on Oct 15, 2025

Look more aggressively for <code>vpgatherdd</code> opportunities

llvm:SelectionDAGSelectionDAGISel as wellSelectionDAGISel as well

missed-optimization

Status: Open.

#163023 In llvm/llvm-project;

· Validark opened on Oct 11, 2025

<code>(Constant &lt;OP&gt; a) &amp; b &amp; ~c</code> should compile to <code>(Constant &lt;OP&gt; a) &amp; (b &amp; ~c)</code>

llvm:optimizations

missed-optimization

Status: Open.

#161630 In llvm/llvm-project;

· Validark opened on Oct 2, 2025

Use <code>BLSR</code> fusions to break dependency chains even when intermediate expression value is consumed

backend:X86

Status: Open.

#160756 In llvm/llvm-project;

· Validark opened on Sep 25, 2025

Compiler hazard on <code>1ULL &lt;&lt; (63 - clz(d))) / d</code>

new issue

Status: Open.

#160692 In llvm/llvm-project;

· Validark opened on Sep 25, 2025

[AVX-512] Replace static <code>vpermi2w</code> with <code>vpermi2b</code> on Intel

backend:X86

Status: Open.

#160348 In llvm/llvm-project;

· Validark opened on Sep 23, 2025