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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wrong passing of arguments on arm64"
href="https://bugs.llvm.org/show_bug.cgi?id=38734">38734</a>
</td>
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<tr>
<th>Summary</th>
<td>wrong passing of arguments on arm64
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>slandden@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20785" name="attach_20785" title="full IR">attachment 20785</a> <a href="attachment.cgi?id=20785&action=edit" title="full IR">[details]</a></span>
full IR
The fallowing zig program segfaults on arm64:
in lldb the i32 argument to function3 is always garbage.
pub fn main() void {
_ = function3(-1);
}
pub fn function3(h: i32) F {
return F{ .h = h };
}
pub const F = struct {
h: i32,
};
Heres the relevent llvm-ir (full included) :
; Function Attrs: nobuiltin nounwind
define internal fastcc void @main() unnamed_addr #4 !dbg !399 {
Entry:
%0 = alloca %F, align 4
call fastcc void @function3(%F* %0, i32 -1), !dbg !400
ret void, !dbg !402
}
; Function Attrs: nobuiltin nounwind
define internal fastcc void @function3(%F* nonnull sret, i32) unnamed_addr #4
!dbg !403 {
Entry:
%2 = alloca %F, align 4
%h = alloca i32, align 4
store i32 %1, i32* %h, align 4
call void @llvm.dbg.declare(metadata i32* %h, metadata !411, metadata
!DIExpression()), !dbg !412
%3 = load i32, i32* %h, align 4, !dbg !413
%4 = getelementptr inbounds %F, %F* %2, i32 0, i32 0, !dbg !416
store i32 %3, i32* %4, align 4, !dbg !416
%5 = bitcast %F* %2 to i8*, !dbg !417
%6 = bitcast %F* %0 to i8*, !dbg !417
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %6, i8* %5, i64 4, i32 4, i1 false),
!dbg !417
ret void, !dbg !417
}</pre>
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