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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt < %s -passes=instcombine -S | FileCheck %s3target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"4target triple = "x86_64-unknown-linux-gnu"5 6define ptr @example(ptr dereferenceable(24) %x) {7; CHECK-LABEL: @example(8; CHECK-NEXT: ret ptr [[X:%.*]]9;10 %y = load ptr, ptr %x, align 811 %y_is_null = icmp eq ptr %y, null12 13 %res = select i1 %y_is_null, ptr null, ptr %x14 15 %nonnull = icmp ne ptr %res, null16 call void @llvm.assume(i1 %nonnull)17 18 ret ptr %res19}20 21; TODO: this should be folded to `ret ptr %x` as well.22define ptr @example2(ptr %x) {23; CHECK-LABEL: @example2(24; CHECK-NEXT: [[Y:%.*]] = load ptr, ptr [[X:%.*]], align 825; CHECK-NEXT: [[Y_IS_NULL:%.*]] = icmp eq ptr [[Y]], null26; CHECK-NEXT: [[RES:%.*]] = select i1 [[Y_IS_NULL]], ptr null, ptr [[X]]27; CHECK-NEXT: [[NONNULL:%.*]] = icmp ne ptr [[RES]], null28; CHECK-NEXT: call void @llvm.assume(i1 [[NONNULL]])29; CHECK-NEXT: ret ptr [[RES]]30;31 %y = load ptr, ptr %x, align 832 %y_is_null = icmp eq ptr %y, null33 34 %res = select i1 %y_is_null, ptr null, ptr %x35 36 %nonnull = icmp ne ptr %res, null37 call void @llvm.assume(i1 %nonnull)38 39 ret ptr %res40}41 42declare void @llvm.assume(i1)43