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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 - Passing long double args on 32-bit SPARC violates ABI"
href="https://bugs.llvm.org/show_bug.cgi?id=42493">42493</a>
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<th>Summary</th>
<td>Passing long double args on 32-bit SPARC violates ABI
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>Sun
</td>
</tr>
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<th>OS</th>
<td>Solaris
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>ABI, miscompilation
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: Sparc
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ro@gcc.gnu.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, venkatra@cs.wisc.edu
</td>
</tr></table>
<p>
<div>
<pre>I'm current working to fix the remaining compiler-rt testsuite bugs on SPARC
(<a href="https://reviews.llvm.org/D40900">https://reviews.llvm.org/D40900</a>). One of the failures is
Builtins-sparc-sunos :: divtc3_test.c
Builtins-sparcv9-sunos :: divtc3_test.c
While the sparcv9 failure is different, the sparc one boils down to incorrectly
passing long double arguments. Consider the following testcase:
$ cat caller.c
extern void callee (long double);
int
main (void)
{
long double ld = 1.0;
callee (ld);
return 0;
}
$ cat callee.c
extern void abort (void);
void
callee (long double ld)
{
if (ld != 1.0)
abort ();
}
$ clang -m32 -c caller.c -o caller.clang.o
$ clang -m32 -c callee.c -o callee.clang.o
$ gcc -m32 -c caller.c -o caller.gcc.o
$ gcc -m32 -c callee.c -o callee.gcc.o
$ gcc -m32 -o clang-gcc caller.clang.o callee.gcc.o
$ ./clang-gcc
Segmentation Fault (core dumped)
$ gcc -m32 -o gcc-clang caller.gcc.o callee.clang.o
$ ./gcc-clang
Abort (core dumped)
The SPARC psABI, p.3-15 (Structure, Union, and Quad-Precision Arguments)
requires long double args to be passed by reference, while clang passes
them by value (as is correct for SPARCv9).</pre>
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