1; RUN: opt -S -instcombine -expensive-combines < %s | FileCheck %s 2target datalayout = "E-m:e-i64:64-n32:64" 3target triple = "powerpc64-unknown-linux-gnu" 4 5@d = global i32 15, align 4 6@b = global i32* @d, align 8 7@a = common global i32 0, align 4 8 9; Function Attrs: nounwind 10define signext i32 @main() #1 { 11entry: 12 %0 = load i32*, i32** @b, align 8 13 %1 = load i32, i32* @a, align 4 14 %lnot = icmp eq i32 %1, 0 15 %lnot.ext = zext i1 %lnot to i32 16 %shr.i = lshr i32 2072, %lnot.ext 17 %call.lobit = lshr i32 %shr.i, 7 18 %2 = and i32 %call.lobit, 1 19 %3 = load i32, i32* %0, align 4 20 %or = or i32 %2, %3 21 store i32 %or, i32* %0, align 4 22 %4 = load i32, i32* @a, align 4 23 %lnot.1 = icmp eq i32 %4, 0 24 %lnot.ext.1 = zext i1 %lnot.1 to i32 25 %shr.i.1 = lshr i32 2072, %lnot.ext.1 26 %call.lobit.1 = lshr i32 %shr.i.1, 7 27 %5 = and i32 %call.lobit.1, 1 28 %or.1 = or i32 %5, %or 29 store i32 %or.1, i32* %0, align 4 30 ret i32 %or.1 31 32; Check that both InstCombine and InstSimplify can use computeKnownBits to 33; realize that: 34; ((2072 >> (L == 0)) >> 7) & 1 35; is always zero. 36 37; CHECK-LABEL: @main 38; CHECK: %[[V1:[0-9]+]] = load i32*, i32** @b, align 8 39; CHECK: %[[V2:[0-9]+]] = load i32, i32* %[[V1]], align 4 40; CHECK: ret i32 %[[V2]] 41} 42 43attributes #0 = { nounwind readnone } 44attributes #1 = { nounwind } 45 46