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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wasm32: v128.load8_lane not used with equivalent pattern"
href="https://bugs.llvm.org/show_bug.cgi?id=50433">50433</a>
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<th>Summary</th>
<td>wasm32: v128.load8_lane not used with equivalent pattern
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: WebAssembly
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Given this LLVM IR:
; ModuleID = 'foo.3a1fbbbh-cgu.0'
source_filename = "foo.3a1fbbbh-cgu.0"
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-wasi"
; Function Attrs: norecurse nounwind readonly willreturn
define dso_local <4 x i32> @v128_load8_lane(i32* nocapture readonly %a, <4 x
i32> %b) unnamed_addr #0 {
start:
%_4 = load i32, i32* %a, align 4
%0 = insertelement <4 x i32> %b, i32 %_4, i32 2
ret <4 x i32> %0
}
attributes #0 = { norecurse nounwind readonly willreturn "target-cpu"="generic"
"target-features"="+simd128" }
this doesn't currently optimize to use the `v128.load8_lane` intrinsic, it
requires using the `llvm.wasm.load32.lane` intrinsic. While not super
problematic it'd be nice if this equivalent pattern was recognized because it'd
allow easy configuration of the alignment on `v128.load8_lane` since it happens
via the `load` instruction separately.</pre>
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