| ; A store or load cannot alias a global if the accessed amount is larger then |
| ; the global. |
| |
| ; RUN: opt < %s -basicaa -gvn -S | FileCheck %s |
| 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" |
| |
| @B = global i16 8 |
| |
| ; CHECK-LABEL: @test1( |
| define i16 @test1(i32* %P) { |
| %X = load i16, i16* @B |
| store i32 7, i32* %P |
| %Y = load i16, i16* @B |
| %Z = sub i16 %Y, %X |
| ret i16 %Z |
| ; CHECK: ret i16 0 |
| } |
| |
| @B_as1 = addrspace(1) global i16 8 |
| |
| define i16 @test1_as1(i32 addrspace(1)* %P) { |
| ; CHECK-LABEL: @test1_as1( |
| ; CHECK: ret i16 0 |
| %X = load i16, i16 addrspace(1)* @B_as1 |
| store i32 7, i32 addrspace(1)* %P |
| %Y = load i16, i16 addrspace(1)* @B_as1 |
| %Z = sub i16 %Y, %X |
| ret i16 %Z |
| } |
| |
| ; Cannot know anything about the size of this global. |
| ; rdar://8813415 |
| @window = external global [0 x i8] |
| |
| ; CHECK-LABEL: @test2( |
| define i8 @test2(i32 %tmp79, i32 %w.2, i32 %indvar89) nounwind { |
| %tmp92 = add i32 %tmp79, %indvar89 |
| %arrayidx412 = getelementptr [0 x i8], [0 x i8]* @window, i32 0, i32 %tmp92 |
| %tmp93 = add i32 %w.2, %indvar89 |
| %arrayidx416 = getelementptr [0 x i8], [0 x i8]* @window, i32 0, i32 %tmp93 |
| |
| %A = load i8, i8* %arrayidx412, align 1 |
| store i8 4, i8* %arrayidx416, align 1 |
| |
| %B = load i8, i8* %arrayidx412, align 1 |
| %C = sub i8 %A, %B |
| ret i8 %C |
| |
| ; CHECK: %B = load i8 |
| ; CHECK: ret i8 %C |
| } |
| |