http://llvm.org/bugs/show_bug.cgi?id=18029
Bug ID: 18029
Summary: miscompilation on i386 with -fPIC (recent regression)
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
r195419 on x86 linux:
% cat b.cc
#include <stdio.h>
int Bar(int *a) {
return *a;
}
int Foo(int *a) {
return Bar(a);
}
int main() {
int a[7] = {0, 1, 2, 3, 4, 5, 6};
printf("result: %d (should be 3)\n", Foo(&a[3]));
}
% clang -m32 -O1 b.cc; ./a.out
result: 3 (should be 3)
% clang -O1 b.cc; ./a.out
result: 3 (should be 3)
% clang -m32 -O1 b.cc -fPIC ; ./a.out
result: 69485705 (should be 3)
%
The code looks like this:
08048400 <_Z3FooPi>:
8048400: e8 eb ff ff ff call 80483f0 <_Z3BarPi>
8048405: c3 ret
This is obviously wrong, you can not call a function with a parameter like
this on i386, where the parameters are passed via stack.
This is a very recent regression.
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