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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GlobalISel][AArch64] Calling convention for HFAs incorrect on big-endian targets"
href="https://bugs.llvm.org/show_bug.cgi?id=35359">35359</a>
</td>
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<tr>
<th>Summary</th>
<td>[GlobalISel][AArch64] Calling convention for HFAs incorrect on big-endian targets
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</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>GlobalISel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>oliver.stannard@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Global-isel generates incorrect code when targeting big-endian AArch64 for this
code:
struct foo {
float first;
float second;
};
float get_first(foo p) {
return p.first;
}
This is the code that global-isel currently generates:
// /work/llvm/build/bin/clang --target=aarch64--none-eabi -march=armv8-a -c
callees.cpp -O0 -mllvm -global-isel=true -mllvm -global-isel-abort=0
-mbig-endian -o - -S
_Z9get_first3foo: // @_Z9get_first3foo
// BB#0: // %entry
sub sp, sp, #16 // =16
// implicit-def: %X8
fmov w9, s0
mov w10, w9
bfxil x8, x10, #0, #32
fmov w9, s1
mov w10, w9
bfi x8, x10, #32, #32
add x10, sp, #8 // =8
str x8, [sp, #8]
ldr w9, [x10]
fmov s0, w9
add sp, sp, #16 // =16
ret
When run on a big-endian target, this incorrectly returns the second member of
the struct, instead of the first.</pre>
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