http://llvm.org/bugs/show_bug.cgi?id=21262
Bug ID: 21262
Summary: Clang passes arguments incorrectly for 64-bit
big-endian MIPS
Product: clang
Version: trunk
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following simple test program demonstrates the issue:
extern int printf(const char *,...);
int main(void)
{
printf("%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,\n",
10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 22);
}
GCC passes each of the int arguments either in register (implicitly extended to
64 bits) or on the stack (stored using sd, explicitly extended). Clang stores
them using sw at the start of the stack slot, meaning that when the callee
loads them and truncates them to 32 bits it only sees the padding value, which
is undefined (whatever is left on the stack previously.
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