680f638027
Dependences between two abstract attributes SRC and TRG come naturally in two flavors: Either (1) "some" information of SRC is *required* for TRG to derive information, or (2) SRC is just an *optional* way for TRG to derive information. While it is not strictly necessary to distinguish these types explicitly, it can help us to converge faster, in terms of iterations, and also cut down the number of `AbstractAttribute::update` calls. As far as I can tell, we only use optional dependences for liveness so far but that might change in the future. With this change the Attributor can be informed about the "dependence class" and it will perform appropriate actions when an Attribute is set to an invalid state, thus one that cannot be used by others to derive information from.
49 lines
1.8 KiB
LLVM
49 lines
1.8 KiB
LLVM
; RUN: opt -S -passes=attributor -aa-pipeline='basic-aa' -attributor-disable=false -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=5 < %s | FileCheck %s
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define dso_local i32 @visible(i32* noalias %A, i32* noalias %B) #0 {
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entry:
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%call1 = call i32 @noalias_args(i32* %A, i32* %B)
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%call2 = call i32 @noalias_args_argmem(i32* %A, i32* %B)
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%add = add nsw i32 %call1, %call2
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ret i32 %add
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}
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; CHECK: define private i32 @noalias_args(i32* nocapture nofree nonnull readonly dereferenceable(4) %A, i32* noalias nocapture nofree nonnull readonly dereferenceable(4) %B)
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define private i32 @noalias_args(i32* %A, i32* %B) #0 {
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entry:
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%0 = load i32, i32* %A, align 4
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%1 = load i32, i32* %B, align 4
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%add = add nsw i32 %0, %1
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%call = call i32 @noalias_args_argmem(i32* %A, i32* %B)
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%add2 = add nsw i32 %add, %call
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ret i32 %add2
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}
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; FIXME: Should be something like this.
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; define internal i32 @noalias_args_argmem(i32* noalias nocapture readonly %A, i32* noalias nocapture readonly %B)
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; CHECK: define internal i32 @noalias_args_argmem(i32* nocapture nofree nonnull readonly dereferenceable(4) %A, i32* nocapture nofree nonnull readonly dereferenceable(4) %B)
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;
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define internal i32 @noalias_args_argmem(i32* %A, i32* %B) #1 {
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entry:
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%0 = load i32, i32* %A, align 4
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%1 = load i32, i32* %B, align 4
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%add = add nsw i32 %0, %1
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ret i32 %add
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}
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define dso_local i32 @visible_local(i32* %A) #0 {
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entry:
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%B = alloca i32, align 4
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store i32 5, i32* %B, align 4
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%call1 = call i32 @noalias_args(i32* %A, i32* nonnull %B)
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%call2 = call i32 @noalias_args_argmem(i32* %A, i32* nonnull %B)
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%add = add nsw i32 %call1, %call2
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ret i32 %add
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}
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attributes #0 = { noinline nounwind uwtable willreturn }
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attributes #1 = { argmemonly noinline nounwind uwtable willreturn}
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