| ; RUN: opt -S -instcombine -expensive-combines < %s | FileCheck %s |
| target datalayout = "E-m:e-i64:64-n32:64" |
| target triple = "powerpc64-unknown-linux-gnu" |
| |
| @d = global i32 15, align 4 |
| @b = global i32* @d, align 8 |
| @a = common global i32 0, align 4 |
| |
| ; Function Attrs: nounwind |
| define signext i32 @main() #1 { |
| entry: |
| %0 = load i32*, i32** @b, align 8 |
| %1 = load i32, i32* @a, align 4 |
| %lnot = icmp eq i32 %1, 0 |
| %lnot.ext = zext i1 %lnot to i32 |
| %shr.i = lshr i32 2072, %lnot.ext |
| %call.lobit = lshr i32 %shr.i, 7 |
| %2 = and i32 %call.lobit, 1 |
| %3 = load i32, i32* %0, align 4 |
| %or = or i32 %2, %3 |
| store i32 %or, i32* %0, align 4 |
| %4 = load i32, i32* @a, align 4 |
| %lnot.1 = icmp eq i32 %4, 0 |
| %lnot.ext.1 = zext i1 %lnot.1 to i32 |
| %shr.i.1 = lshr i32 2072, %lnot.ext.1 |
| %call.lobit.1 = lshr i32 %shr.i.1, 7 |
| %5 = and i32 %call.lobit.1, 1 |
| %or.1 = or i32 %5, %or |
| store i32 %or.1, i32* %0, align 4 |
| ret i32 %or.1 |
| |
| ; Check that both InstCombine and InstSimplify can use computeKnownBits to |
| ; realize that: |
| ; ((2072 >> (L == 0)) >> 7) & 1 |
| ; is always zero. |
| |
| ; CHECK-LABEL: @main |
| ; CHECK: %[[V1:[0-9]+]] = load i32*, i32** @b, align 8 |
| ; CHECK: %[[V2:[0-9]+]] = load i32, i32* %[[V1]], align 4 |
| ; CHECK: ret i32 %[[V2]] |
| } |
| |
| attributes #0 = { nounwind readnone } |
| attributes #1 = { nounwind } |
| |