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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing (potentially lots of) optimizations for type c_void* when compared to i8*"
href="https://bugs.llvm.org/show_bug.cgi?id=36795">36795</a>
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<th>Summary</th>
<td>Missing (potentially lots of) optimizations for type c_void* when compared to i8*
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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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>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>gonzalobg88@gmail.com
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</tr>
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<th>CC</th>
<td>chandlerc@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>See it live: <a href="https://godbolt.org/g/nNDaWy">https://godbolt.org/g/nNDaWy</a>
This IR using i8*:
define void @call_malloc() #0 {
%1 = call i8* @malloc(i64 1)
ret void
}
declare i8* @malloc(i64) #1
optimizes to:
define void @call_malloc() local_unnamed_addr #0 {
ret void
}
attributes #0 = { norecurse nounwind readnone }
while this IR using an opaque type c_void *:
%struct.c_void = type opaque
define void @call_malloc() #0 {
%1 = call %struct.c_void* @malloc(i64 1)
ret void
}
declare %struct.c_void* @malloc(i64) #1
optimizes to:
%struct.c_void = type opaque
define void @call_malloc() local_unnamed_addr #0 {
%1 = tail call %struct.c_void* @malloc(i64 1)
ret void
}
declare noalias %struct.c_void* @malloc(i64) local_unnamed_addr #0
attributes #0 = { nounwind }
Note, in particular, that the call to malloc has not been removed.</pre>
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