derek.holloway
7502bf64a4
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53 lines
1.4 KiB
LLVM
53 lines
1.4 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 -aa-pipeline=basic-aa -passes=gvn -S | FileCheck %s
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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"
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@B = global i16 8
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; CHECK-LABEL: @test1(
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define i16 @test1(ptr %P) {
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%X = load i16, ptr @B
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store i32 7, ptr %P
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%Y = load i16, ptr @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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@B_as1 = addrspace(1) global i16 8
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define i16 @test1_as1(ptr addrspace(1) %P) {
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; CHECK-LABEL: @test1_as1(
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; CHECK: ret i16 0
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%X = load i16, ptr addrspace(1) @B_as1
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store i32 7, ptr addrspace(1) %P
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%Y = load i16, ptr addrspace(1) @B_as1
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%Z = sub i16 %Y, %X
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ret i16 %Z
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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-LABEL: @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], ptr @window, i32 0, i32 %tmp92
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%tmp93 = add i32 %w.2, %indvar89
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%arrayidx416 = getelementptr [0 x i8], ptr @window, i32 0, i32 %tmp93
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%A = load i8, ptr %arrayidx412, align 1
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store i8 4, ptr %arrayidx416, align 1
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%B = load i8, ptr %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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