1 ; RUN: opt -S -basicaa -dse < %s | FileCheck %s 2 3 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 4 target triple = "x86_64-unknown-linux-gnu" 5 6 ; We incorrectly returned noalias in the example below for "ptr.64" and 7 ; "either_ptr.64". 8 ; PR18460 9 10 %nested = type { %nested.i64 } 11 %nested.i64 = type { i64 } 12 13 define i64 @testcase(%nested * noalias %p1, %nested * noalias %p2, 14 i32 %a, i32 %b) { 15 %ptr = getelementptr inbounds %nested, %nested* %p1, i64 -1, i32 0 16 %ptr.64 = getelementptr inbounds %nested.i64, %nested.i64* %ptr, i64 0, i32 0 17 %ptr2= getelementptr inbounds %nested, %nested* %p2, i64 0, i32 0 18 %cmp = icmp ult i32 %a, %b 19 %either_ptr = select i1 %cmp, %nested.i64* %ptr2, %nested.i64* %ptr 20 %either_ptr.64 = getelementptr inbounds %nested.i64, %nested.i64* %either_ptr, i64 0, i32 0 21 22 ; Because either_ptr.64 and ptr.64 can alias (we used to return noalias) 23 ; elimination of the first store is not valid. 24 25 ; CHECK: store i64 2 26 ; CHECK: load 27 ; CHECK: store i64 1 28 29 store i64 2, i64* %ptr.64, align 8 30 %r = load i64, i64* %either_ptr.64, align 8 31 store i64 1, i64* %ptr.64, align 8 32 ret i64 %r 33 } 34
