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Hi, Let's have a simple program: define i32 @main(i32 %n, i64 %idx) { %idxSafe = trunc i64 %idx to i5 %r = extractelement <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, i64 %idx ret i32 %r } The assembly of that would be: pcmpeqd %xmm0, %xmm0 movdqa %xmm0, -24(%rsp) movl -24(%rsp,%rsi,4), %eax retq The language reference states that the extractelement instruction produces

...one to eat the cost of a mask. This seems like the appropriate decision to me. It's closely in line with existing practice and assumptions. Philip -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150626/4d44fda7/attachment.html>