http://llvm.org/bugs/show_bug.cgi?id=3414
Summary: missing x86-64 ABI alignment for arrays
Product: tools
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: llvm-gcc
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The x86-64 ABI states
"An array uses the same alignment as its elements, except that a local or
global
array variable of length at least 16 bytes or a C99 variable-length array
variable
always has alignment of at least 16 bytes."
For the following testcase:
void frob(void *);
void foo(void) {
char x[17];
frob(x);
}
llvm-gcc -m64 emits
[...]
subq $32, $rsp
leaq -17(%rsp), %rdi
call frob
which shows that the array is not being aligned on a 16 byte boundary.
The LLVM IR has this:
%x = alloca [17 x 18]
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