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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang fails to set strictfp function attribute"
href="https://bugs.llvm.org/show_bug.cgi?id=44571">44571</a>
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<th>Summary</th>
<td>clang fails to set strictfp function attribute
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>mib.bugzilla@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>I got an email about this issue: It looks like clang isn't setting the
strictfp attribute added to the functions that use constrained intrinsics in
all cases. This problem has been identified in unary conversions, builtins, and
_Complex.
This fails to set the attribute, but uses constrained functions
float _Complex foo(float _Complex a, float _Complex b) {
return a + b;
}
Or this compiled with -fno-math-errno
float foo(float a, float b) {
return sinf(a);
}
Here's another example, <a href="https://godbolt.org/z/bcVV6A">https://godbolt.org/z/bcVV6A</a>
Andy Kaylor suggested "Can’t we mark functions with the strictfp attribute any
time a constrained mode is enabled within the function, regardless of whether
or not it uses an FP operation? For example, functions get the
"unsafe-fp-math"="false" attribute without regard to whether or not they
contain fp operations. I would expect strictfp to be the same."</pre>
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