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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Cast to typedef __attribute__((aligned(N))) pointer doesn't respect the requested alignment anymore."
href="https://llvm.org/bugs/show_bug.cgi?id=24944">24944</a>
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<th>Summary</th>
<td>Cast to typedef __attribute__((aligned(N))) pointer doesn't respect the requested alignment anymore.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ahmed.bougacha@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>typedef int __attribute__((ext_vector_type(4))) v4i32;
typedef v4i32 __attribute__((aligned(2))) v4i32_a2;
v4i32 l1(v4i32 *p) {
v4i32_a2 *p2 = p;
return *p2;
}
v4i32 l2(v4i32 *p) {
return *(v4i32_a2*)p;
}
This used to generate:
define <4 x i32> @l1(<4 x i32>* nocapture readonly %p) #0 {
%1 = load <4 x i32>* %p, align 2, !tbaa !2
ret <4 x i32> %1
}
; Function Attrs: nounwind readonly ssp uwtable
define <4 x i32> @l2(<4 x i32>* nocapture readonly %p) #0 {
%1 = load <4 x i32>* %p, align 2, !tbaa !2
ret <4 x i32> %1
}
but now generates:
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.11.0"
; Function Attrs: nounwind readonly ssp uwtable
define <4 x i32> @l1(<4 x i32>* nocapture readonly %p) #0 {
entry:
%0 = load <4 x i32>, <4 x i32>* %p, align 2, !tbaa !2
ret <4 x i32> %0
}
; Function Attrs: nounwind readonly ssp uwtable
define <4 x i32> @l2(<4 x i32>* nocapture readonly %p) #0 {
entry:
%0 = load <4 x i32>, <4 x i32>* %p, align 16, !tbaa !2 ;; <- why not align
2?
ret <4 x i32> %0
}</pre>
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