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https://github.com/c64scene-ar/llvm-6502.git
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d8bd7ce2ca
CFLAA didn't know how to properly handle ConstantExprs; it would silently ignore them. This was a problem if the ConstantExpr is, say, a GEP of a global, because CFLAA wouldn't realize that there's a global there. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231743 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
1.8 KiB
LLVM
58 lines
1.8 KiB
LLVM
; This testcase consists of alias relations which should be completely
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; resolvable by cfl-aa, but require analysis of getelementptr constant exprs.
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; Derived from BasicAA/2003-12-11-ConstExprGEP.ll
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; RUN: opt < %s -cfl-aa -aa-eval -print-may-aliases -disable-output 2>&1 | FileCheck %s
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%T = type { i32, [10 x i8] }
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@G = external global %T
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@G2 = external global %T
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; TODO: Quite a few of these are MayAlias because we don't yet consider
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; constant offsets in CFLAA. If we start doing so, then we'll need to
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; change these test cases
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; CHECK: Function: test
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; CHECK: MayAlias: i32* %D, i32* %F
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; CHECK: MayAlias: i32* %D, i8* %X
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; CHECK: MayAlias: i32* %F, i8* %X
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define void @test() {
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%D = getelementptr %T, %T* @G, i64 0, i32 0
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%F = getelementptr i32, i32* getelementptr (%T* @G, i64 0, i32 0), i64 0
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%X = getelementptr [10 x i8], [10 x i8]* getelementptr (%T* @G, i64 0, i32 1), i64 0, i64 5
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ret void
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}
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; CHECK: Function: simplecheck
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; CHECK: MayAlias: i32* %F, i32* %arg0
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; CHECK: MayAlias: i32* %H, i32* %arg0
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; CHECK: MayAlias: i32* %F, i32* %H
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define void @simplecheck(i32* %arg0) {
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%F = getelementptr i32, i32* getelementptr (%T* @G, i64 0, i32 0), i64 0
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%H = getelementptr %T, %T* @G2, i64 0, i32 0
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ret void
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}
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; Ensure that CFLAA properly identifies and handles escaping variables (i.e.
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; globals) in nested ConstantExprs
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; CHECK: Function: checkNesting
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; CHECK: MayAlias: i32* %A, i32* %arg0
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%NestedT = type { [1 x [1 x i32]] }
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@NT = external global %NestedT
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define void @checkNesting(i32* %arg0) {
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%A = getelementptr [1 x i32],
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[1 x i32]* getelementptr
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([1 x [1 x i32]]* getelementptr (%NestedT* @NT, i64 0, i32 0),
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i64 0,
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i32 0),
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i64 0,
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i32 0
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ret void
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}
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