1 ; A store or load cannot alias a global if the accessed amount is larger then 2 ; the global. 3 4 ; RUN: opt < %s -basicaa -gvn -S | FileCheck %s 5 target datalayout = "E-p:64:64:64-p1:16:16:16-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128" 6 7 @B = global i16 8 8 9 ; CHECK-LABEL: @test1( 10 define i16 @test1(i32* %P) { 11 %X = load i16* @B 12 store i32 7, i32* %P 13 %Y = load i16* @B 14 %Z = sub i16 %Y, %X 15 ret i16 %Z 16 ; CHECK: ret i16 0 17 } 18 19 @B_as1 = addrspace(1) global i16 8 20 21 define i16 @test1_as1(i32 addrspace(1)* %P) { 22 ; CHECK-LABEL: @test1_as1( 23 ; CHECK: ret i16 0 24 %X = load i16 addrspace(1)* @B_as1 25 store i32 7, i32 addrspace(1)* %P 26 %Y = load i16 addrspace(1)* @B_as1 27 %Z = sub i16 %Y, %X 28 ret i16 %Z 29 } 30 31 ; Cannot know anything about the size of this global. 32 ; rdar://8813415 33 @window = external global [0 x i8] 34 35 ; CHECK-LABEL: @test2( 36 define i8 @test2(i32 %tmp79, i32 %w.2, i32 %indvar89) nounwind { 37 %tmp92 = add i32 %tmp79, %indvar89 38 %arrayidx412 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp92 39 %tmp93 = add i32 %w.2, %indvar89 40 %arrayidx416 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp93 41 42 %A = load i8* %arrayidx412, align 1 43 store i8 4, i8* %arrayidx416, align 1 44 45 %B = load i8* %arrayidx412, align 1 46 %C = sub i8 %A, %B 47 ret i8 %C 48 49 ; CHECK: %B = load i8 50 ; CHECK: ret i8 %C 51 } 52 53
