https://bugs.llvm.org/show_bug.cgi?id=39492
Bug ID: 39492
Summary: GCC and LLVM pass i128 incompatibly on
x86_64-windows-gnu
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: r...@google.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
Consider this code:
typedef int my_int128_t __attribute__((mode(TI)));
my_int128_t foo() { return -2; }
GCC:
foo:
.seh_endprologue
movdqa .LC0(%rip), %xmm0
ret
Clang:
foo: # @foo
# %bb.0: # %entry
movq $-2, %rax
movq $-1, %rdx
retq
So, XMM0 vs. RAX:RDX.
I noticed this because clang fails to call its own 128-bit compiler rt division
functions correctly. Apparently I committed a patch back in r208029 to add a
special case to make __divti3 match GCC. If we fix this bug, we won't need that
hack anymore.
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
