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d41760
2018 May 23
0
RFC: should CVP always narrow the width of lshr?
Hi.
In https://reviews.llvm.org/D46760,
Bixia Zheng notes that given the pattern like [1]
%za = zext i32 %a to i64
%udiv = udiv i64 %za, <C>
%urem = urem i64 %za, <C>
%uadd = add i64 %udiv, %urem
ret i64 %uadd
the CVP will reduce the width of udiv/urem,
without considerations for the new instructions,
or whether t...