1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -passes=instcombine -S | FileCheck %s 3target 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 8 11 %y_is_null = icmp eq ptr %y, null 12 13 %res = select i1 %y_is_null, ptr null, ptr %x 14 15 %nonnull = icmp ne ptr %res, null 16 call void @llvm.assume(i1 %nonnull) 17 18 ret ptr %res 19} 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 8 25; CHECK-NEXT: [[Y_IS_NULL:%.*]] = icmp eq ptr [[Y]], null 26; CHECK-NEXT: [[RES:%.*]] = select i1 [[Y_IS_NULL]], ptr null, ptr [[X]] 27; CHECK-NEXT: [[NONNULL:%.*]] = icmp ne ptr [[RES]], null 28; CHECK-NEXT: call void @llvm.assume(i1 [[NONNULL]]) 29; CHECK-NEXT: ret ptr [[RES]] 30; 31 %y = load ptr, ptr %x, align 8 32 %y_is_null = icmp eq ptr %y, null 33 34 %res = select i1 %y_is_null, ptr null, ptr %x 35 36 %nonnull = icmp ne ptr %res, null 37 call void @llvm.assume(i1 %nonnull) 38 39 ret ptr %res 40} 41 42declare void @llvm.assume(i1) 43