1 ; RUN: opt -S -instcombine < %s | FileCheck %s 2 ; RUN: opt -S -instsimplify < %s | FileCheck %s 3 target datalayout = "E-m:e-i64:64-n32:64" 4 target triple = "powerpc64-unknown-linux-gnu" 5 6 @d = global i32 15, align 4 7 @b = global i32* @d, align 8 8 @a = common global i32 0, align 4 9 10 ; Function Attrs: nounwind 11 define signext i32 @main() #1 { 12 entry: 13 %0 = load i32*, i32** @b, align 8 14 %1 = load i32, i32* @a, align 4 15 %lnot = icmp eq i32 %1, 0 16 %lnot.ext = zext i1 %lnot to i32 17 %shr.i = lshr i32 2072, %lnot.ext 18 %call.lobit = lshr i32 %shr.i, 7 19 %2 = and i32 %call.lobit, 1 20 %3 = load i32, i32* %0, align 4 21 %or = or i32 %2, %3 22 store i32 %or, i32* %0, align 4 23 %4 = load i32, i32* @a, align 4 24 %lnot.1 = icmp eq i32 %4, 0 25 %lnot.ext.1 = zext i1 %lnot.1 to i32 26 %shr.i.1 = lshr i32 2072, %lnot.ext.1 27 %call.lobit.1 = lshr i32 %shr.i.1, 7 28 %5 = and i32 %call.lobit.1, 1 29 %or.1 = or i32 %5, %or 30 store i32 %or.1, i32* %0, align 4 31 ret i32 %or.1 32 33 ; Check that both InstCombine and InstSimplify can use computeKnownBits to 34 ; realize that: 35 ; ((2072 >> (L == 0)) >> 7) & 1 36 ; is always zero. 37 38 ; CHECK-LABEL: @main 39 ; CHECK: %[[V1:[0-9]+]] = load i32*, i32** @b, align 8 40 ; CHECK: %[[V2:[0-9]+]] = load i32, i32* %[[V1]], align 4 41 ; CHECK: ret i32 %[[V2]] 42 } 43 44 attributes #0 = { nounwind readnone } 45 attributes #1 = { nounwind } 46 47
