I think I found a bug in LLVM 3.0: When compiling for a target without SSE2 support, there were some 128-bit PXOR instructions in the generated code.
I traced it down to the following definition in X86InstrSSE.td:
def FsFLD0SS : I<0xEF, MRMInitReg, (outs FR32:$dst), (ins), "",
[(set FR32:$dst, fp32imm0)]>,
Requires<[HasSSE1]>, TB, OpSize;
I tried replacing the HasSSE1 with a HasSSE2 but that didn't do the trick. I noticed that TOT has a different definition and I tried substituting that as well but again no luck. Is there a simple way to make it work with LLVM 3.0 or should I consider updating to a later version?