derek.holloway
7502bf64a4
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56 lines
2.0 KiB
LLVM
56 lines
2.0 KiB
LLVM
; Test that LICM uses basicaa to do alias analysis, which is capable of
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; disambiguating some obvious cases. If LICM is able to disambiguate the
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; two pointers, then the load should be hoisted, and the store sunk.
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; RUN: opt < %s -aa-pipeline=basic-aa -passes='loop-mssa(licm)' -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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@A = global i32 7 ; <ptr> [#uses=3]
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@B = global i32 8 ; <ptr> [#uses=2]
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@C = global [2 x i32] [ i32 4, i32 8 ] ; <ptr> [#uses=2]
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define i32 @test1(i1 %c) {
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%Atmp = load i32, ptr @A ; <i32> [#uses=2]
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br label %Loop
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Loop: ; preds = %Loop, %0
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%ToRemove = load i32, ptr @A ; <i32> [#uses=1]
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store i32 %Atmp, ptr @B
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br i1 %c, label %Out, label %Loop
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Out: ; preds = %Loop
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%X = sub i32 %ToRemove, %Atmp ; <i32> [#uses=1]
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ret i32 %X
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; The Loop block should be empty after the load/store are promoted.
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; CHECK: @test1
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; CHECK: load i32, ptr @A
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; CHECK: load i32, ptr @A
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; CHECK: store i32 %Atmp, ptr @B
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %c, label %Out, label %Loop
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; CHECK: Out:
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}
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define i32 @test2(i1 %c) {
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br label %Loop
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Loop: ; preds = %Loop, %0
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%AVal = load i32, ptr @A ; <i32> [#uses=2]
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%C0 = getelementptr [2 x i32], ptr @C, i64 0, i64 0 ; <ptr> [#uses=1]
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store i32 %AVal, ptr %C0
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%BVal = load i32, ptr @B ; <i32> [#uses=2]
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%C1 = getelementptr [2 x i32], ptr @C, i64 0, i64 1 ; <ptr> [#uses=1]
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store i32 %BVal, ptr %C1
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br i1 %c, label %Out, label %Loop
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Out: ; preds = %Loop
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%X = sub i32 %AVal, %BVal ; <i32> [#uses=1]
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ret i32 %X
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; The Loop block should be empty after the load/store are promoted.
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; CHECK: @test2
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %c, label %Out, label %Loop
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}
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