https://bugs.llvm.org/show_bug.cgi?id=50234
Bug ID: 50234
Summary: [PPC] Value of local variable corrupted with
`__builtin_setjmp`
Product: new-bugs
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Created attachment 24831
--> https://bugs.llvm.org/attachment.cgi?id=24831&action=edit
Repro
The attached C program (named ppc_bsjlj.c) behaves incorrectly when compiled
with optimization level -O1 or higher for PPC targets.
For 32-bit PPC
$ clang --target=powerpc-unknown-linux-gnu -O3 -c ppc_bsjlj.c
results in the output
value = 268566576
value = 268566596
where the two lines should be identical.
Similarly, for ppc64le
$ clang --target=powerpc64le-unknown-linux-gnu -O3 -c ppc_bsjlj.c
results in
value = 268566608
value = 268566648
Note that in the program the value of the local variable `n` is not changed
between `__builtin_setjmp` and the corresponding `__builtin_longjmp`. Indeed it
is const-qualified.
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