1; This testcase is incorrectly getting completely eliminated. There should be 2; SOME instruction named %c here, even if it's a bitwise and. 3; 4; RUN: opt < %s -instcombine -S | grep %c 5; 6define i64 @test3(i64 %A) { 7 %c1 = trunc i64 %A to i8 ; <i8> [#uses=1] 8 %c2 = zext i8 %c1 to i64 ; <i64> [#uses=1] 9 ret i64 %c2 10} 11 12