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llvm-project/llvm/test/Analysis/CFLAliasAnalysis/Steensgaard/opaque-call-alias.ll

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Fix: CFLAA -- Mark no-args returns as unknown Prior to this patch, we hadn't been marking StratifiedSets with the appropriate StratifiedAttrs when handling the result of no-args call instructions. This caused us to report NoAlias when handed, for example, an escaped alloca and a result from an opaque function. Now we properly mark the return value of said functions. Thanks again to Chandler, Richard, and Nick for pinging me about this. Differential review: http://reviews.llvm.org/D12408 llvm-svn: 246240
2015-08-28 08:16:18 +08:00
; We previously had a case where we would put results from a no-args call in
; its own stratified set. This would make cases like the one in @test say that
; nothing (except %Escapes and %Arg) can alias
[BasicAA] Rename -disable-basicaa to -disable-basic-aa to be consistent with the canonical name "basic-aa"
2020-06-27 11:55:44 +08:00
; RUN: opt < %s -disable-basic-aa -cfl-steens-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
Fix: CFLAA -- Mark no-args returns as unknown Prior to this patch, we hadn't been marking StratifiedSets with the appropriate StratifiedAttrs when handling the result of no-args call instructions. This caused us to report NoAlias when handed, for example, an escaped alloca and a result from an opaque function. Now we properly mark the return value of said functions. Thanks again to Chandler, Richard, and Nick for pinging me about this. Differential review: http://reviews.llvm.org/D12408 llvm-svn: 246240
2015-08-28 08:16:18 +08:00
; CHECK: Function: test
[CFLAA] Tag arguments as escaped instead of unknown. This patch also includes some refactoring. Prior to this patch, we tagged all CFLAA attributes as unknown. This is suboptimal, since it meant that any Value used as an argument would be considered to alias any other Value that existed. Now that we have the machinery to tag sets below the set for an arbitrary value with attributes, it's okay to be less conservative with arguments. (Specifically, we still tag the set under an argument with unknown). Patch by Jia Chen. Differential Revision: http://reviews.llvm.org/D21262 llvm-svn: 272690
2016-06-15 02:12:28 +08:00
; CHECK: NoAlias: i8* %Arg, i8* %Escapes
Fix: CFLAA -- Mark no-args returns as unknown Prior to this patch, we hadn't been marking StratifiedSets with the appropriate StratifiedAttrs when handling the result of no-args call instructions. This caused us to report NoAlias when handed, for example, an escaped alloca and a result from an opaque function. Now we properly mark the return value of said functions. Thanks again to Chandler, Richard, and Nick for pinging me about this. Differential review: http://reviews.llvm.org/D12408 llvm-svn: 246240
2015-08-28 08:16:18 +08:00
; CHECK: MayAlias: i8* %Arg, i8* %Retrieved
; CHECK: MayAlias: i8* %Escapes, i8* %Retrieved
define void @test(i8* %Arg) {
%Noalias = alloca i8
%Escapes = alloca i8
call void @set_thepointer(i8* %Escapes)
%Retrieved = call i8* @get_thepointer()
ret void
}
declare void @set_thepointer(i8* %P)
declare i8* @get_thepointer()