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; A store or load cannot alias a global if the accessed amount is larger then
; the global.
; RUN: opt < %s -basic-aa -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
}
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