bfa401e5ad
StratifiedSets (as implemented) is very fast, but its accuracy is also limited. If we take a more aggressive andersens-like approach, we can be way more accurate, but we'll also end up being slower. So, we've decided to split CFLAA into CFLSteensAA and CFLAndersAA. Long-term, we want to end up in a place where CFLSteens is queried first; if it can provide an answer, great (since queries are basically map lookups). Otherwise, we'll fall back to CFLAnders, BasicAA, etc. This patch splits everything out so we can try to do something like that when we get a reasonable CFLAnders implementation. Patch by Jia Chen. Differential Revision: http://reviews.llvm.org/D21910 llvm-svn: 274589
58 lines
1.8 KiB
LLVM
58 lines
1.8 KiB
LLVM
; This testcase consists of alias relations which should be completely
|
|
; resolvable by cfl-steens-aa, but require analysis of getelementptr constant exprs.
|
|
; Derived from BasicAA/2003-12-11-ConstExprGEP.ll
|
|
|
|
; RUN: opt < %s -disable-basicaa -cfl-steens-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s
|
|
|
|
%T = type { i32, [10 x i8] }
|
|
|
|
@G = external global %T
|
|
@G2 = external global %T
|
|
|
|
; TODO: Quite a few of these are MayAlias because we don't yet consider
|
|
; constant offsets in CFLSteensAA. If we start doing so, then we'll need to
|
|
; change these test cases
|
|
|
|
; CHECK: Function: test
|
|
; CHECK: MayAlias: i32* %D, i32* %F
|
|
; CHECK: MayAlias: i32* %D, i8* %X
|
|
; CHECK: MayAlias: i32* %F, i8* %X
|
|
define void @test() {
|
|
%D = getelementptr %T, %T* @G, i64 0, i32 0
|
|
%F = getelementptr i32, i32* getelementptr (%T, %T* @G, i64 0, i32 0), i64 0
|
|
%X = getelementptr [10 x i8], [10 x i8]* getelementptr (%T, %T* @G, i64 0, i32 1), i64 0, i64 5
|
|
|
|
ret void
|
|
}
|
|
|
|
; CHECK: Function: simplecheck
|
|
; CHECK: MayAlias: i32* %F, i32* %arg0
|
|
; CHECK: MayAlias: i32* %H, i32* %arg0
|
|
; CHECK: MayAlias: i32* %F, i32* %H
|
|
define void @simplecheck(i32* %arg0) {
|
|
%F = getelementptr i32, i32* getelementptr (%T, %T* @G, i64 0, i32 0), i64 0
|
|
%H = getelementptr %T, %T* @G2, i64 0, i32 0
|
|
|
|
ret void
|
|
}
|
|
|
|
; Ensure that CFLSteensAA properly identifies and handles escaping variables (i.e.
|
|
; globals) in nested ConstantExprs
|
|
|
|
; CHECK: Function: checkNesting
|
|
; CHECK: MayAlias: i32* %A, i32* %arg0
|
|
|
|
%NestedT = type { [1 x [1 x i32]] }
|
|
@NT = external global %NestedT
|
|
|
|
define void @checkNesting(i32* %arg0) {
|
|
%A = getelementptr [1 x i32],
|
|
[1 x i32]* getelementptr
|
|
([1 x [1 x i32]], [1 x [1 x i32]]* getelementptr (%NestedT, %NestedT* @NT, i64 0, i32 0),
|
|
i64 0,
|
|
i32 0),
|
|
i64 0,
|
|
i32 0
|
|
ret void
|
|
}
|