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41 lines
1.1 KiB
LLVM
41 lines
1.1 KiB
LLVM
; A store or load cannot alias a global if the accessed amount is larger then
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; the global.
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; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
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target datalayout = "E-p:64:64:64-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"
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@B = global i16 8
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; CHECK: @test1
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define i16 @test1(i32* %P) {
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%X = load i16* @B
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store i32 7, i32* %P
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%Y = load i16* @B
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%Z = sub i16 %Y, %X
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ret i16 %Z
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; CHECK: ret i16 0
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}
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; Cannot know anything about the size of this global.
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; rdar://8813415
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@window = external global [0 x i8]
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; CHECK: @test2
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define i8 @test2(i32 %tmp79, i32 %w.2, i32 %indvar89) nounwind {
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%tmp92 = add i32 %tmp79, %indvar89
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%arrayidx412 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp92
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%tmp93 = add i32 %w.2, %indvar89
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%arrayidx416 = getelementptr [0 x i8]* @window, i32 0, i32 %tmp93
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%A = load i8* %arrayidx412, align 1
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store i8 4, i8* %arrayidx416, align 1
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%B = load i8* %arrayidx412, align 1
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%C = sub i8 %A, %B
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ret i8 %C
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; CHECK: %B = load i8
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; CHECK: ret i8 %C
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}
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