[llvm-bugs] [Bug 31880] shuffle and vectorize repeated scalar ops on extracted elements
via llvm-bugs
llvm-bugs at lists.llvm.org
Fri Sep 8 09:21:42 PDT 2017
https://bugs.llvm.org/show_bug.cgi?id=31880
Simon Pilgrim <llvm-dev at redking.me.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
Fixed By Commit(s)| |309812
--- Comment #2 from Simon Pilgrim <llvm-dev at redking.me.uk> ---
Fixed in trunk by rL309812:
opt pr31880.ll -S -slp-vectorizer
define <2 x i8> @g(<2 x i8> %x, <2 x i8> %y) {
%x0 = extractelement <2 x i8> %x, i32 0
%y1 = extractelement <2 x i8> %y, i32 1
%1 = insertelement <2 x i8> undef, i8 %x0, i32 0
%2 = insertelement <2 x i8> %1, i8 %y1, i32 1
%3 = mul <2 x i8> %2, %2
%4 = extractelement <2 x i8> %3, i32 0
%ins1 = insertelement <2 x i8> undef, i8 %4, i32 0
%5 = extractelement <2 x i8> %3, i32 1
%ins2 = insertelement <2 x i8> %ins1, i8 %5, i32 1
ret <2 x i8> %ins2
}
opt pr31880.ll -S -slp-vectorizer -instcombine
define <2 x i8> @g(<2 x i8> %x, <2 x i8> %y) {
%1 = shufflevector <2 x i8> %x, <2 x i8> %y, <2 x i32> <i32 0, i32 3>
%2 = mul <2 x i8> %1, %1
ret <2 x i8> %2
}
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