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[X86] Add test for v4i8 loop sad pattern.

Authored by craig.topper on Sat, Mar 21, 3:27 PM.

Description

[X86] Add test for v4i8 loop sad pattern.

This cases produces a psadbw that doesn't need to be widened or
extracted so takes a slightly different code path in
combineLoopSADPattern.

Details

Committed
craig.topperSat, Mar 21, 3:27 PM
Parents
rGd779ee152cef: [gn build] Port 34fd007aaf8
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