http://llvm.org/bugs/show_bug.cgi?id=20726
Bug ID: 20726
Summary: Empty inline assembly block results in erroneous stack
pointer and segmentation fault
Product: clang
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: release blocker
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Error occurs on iOS, in C++ code built with Xcode 5.1.1, using -mno-thumb.
The following boiled-down function seems to reproduce the issue both with and
without optimisation enabled. I've inspected the disassembly without
optimisation and there does seem to be an error in the generated code which
causes SP to receive an erroneous value.
inline void test()
{
register int v0 asm ("r0") = 0;
register int v1 asm ("r1") = 0;
register int v2 asm ("r2") = 0;
register int v3 asm ("r3") = 0;
register int v4 asm ("r4") = 0;
register int v5 asm ("r5") = 0;
register int v6 asm ("r6") = 0;
register int v7 asm ("r7") = 0;
int v8 = 0;
int v9 = 0;
asm volatile (
""
:
[v0] "+r" (v0),
[v1] "+r" (v1),
[v2] "+r" (v2),
[v3] "+r" (v3),
[v4] "+r" (v4),
[v5] "+r" (v5),
[v6] "+r" (v6),
[v7] "+r" (v7),
[v8] "+r" (v8),
[v9] "+r" (v9)
::);
}
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