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2012 May 15
1
[LLVMdev] test all ones/zeros in vector
Hi all,
is there a portable and effective way of emitting code which checks whether all vector elements are true or false?
Currently, I'm doing this:
%sext = sext <4 x i1> %my_cmp to <4 x i8>
%bcast = bitcast <4 x i8> %sext to i32
%all_zeros = icmp ne i32 %bcast, 0
br i1 %all_zeros, label %A, label %B
The emitted code works, but it's not great. I'd like to make use of movmask or ptest in the case of SSE.
Of course, I could emit some intrinsic fun...