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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ARM interrupt attribute warning incorrect for M-profile"
href="https://bugs.llvm.org/show_bug.cgi?id=48471">48471</a>
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<th>Summary</th>
<td>ARM interrupt attribute warning incorrect for M-profile
</td>
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<th>Product</th>
<td>clang
</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>Windows NT
</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>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>john.brawn@arm.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>If you compile the following
extern void fn(void);
__attribute__((interrupt)) void example(void) {
fn();
return;
}
with --target=arm-none-eabi -mcpu=cortex-m7 you get
tmp.c:3:3: warning: call to function without interrupt attribute could clobber
interruptee's VFP registers [-Wextra]
fn();
^
This warning is incorrect for M-profile CPUs, as VFP registers are
automatically saved and later restored in M-profile CPUs when entering an
exception (or when a VFP register is modified in an exception handler if lazy
context save is enabled).</pre>
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