Aliasing rules for struct-path aware TBAA.

Added PathAliases to check if two struct-path tags can alias.
Added command line option -struct-path-tbaa.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179337 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 392 insertions, 0 deletions

diff --git a/test/Analysis/TypeBasedAliasAnalysis/tbaa-path.ll b/test/Analysis/TypeBasedAliasAnalysis/tbaa-path.ll
new file mode 100644
index 0000000000..c63abca388
--- /dev/null
+++ b/test/Analysis/TypeBasedAliasAnalysis/tbaa-path.ll
@@ -0,0 +1,392 @@
+; RUN: opt < %s -tbaa -basicaa -struct-path-tbaa -aa-eval -evaluate-tbaa -print-no-aliases -print-may-aliases -disable-output 2>&1 | FileCheck %s
+; RUN: opt < %s -tbaa -basicaa -struct-path-tbaa -gvn -S | FileCheck %s --check-prefix=OPT
+; Generated from clang/test/CodeGen/tbaa.cpp with "-O1 -struct-path-tbaa -disable-llvm-optzns".
+
+%struct.StructA = type { i16, i32, i16, i32 }
+%struct.StructB = type { i16, %struct.StructA, i32 }
+%struct.StructS = type { i16, i32 }
+%struct.StructS2 = type { i16, i32 }
+%struct.StructC = type { i16, %struct.StructB, i32 }
+%struct.StructD = type { i16, %struct.StructB, i32, i8 }
+
+define i32 @_Z1gPjP7StructAy(i32* %s, %struct.StructA* %A, i64 %count) #0 {
+entry:
+; Access to i32* and &(A->f32).
+; CHECK: Function
+; CHECK: MayAlias:   store i32 4, i32* %f32, align 4, !tbaa !8 <->   store i32 1, i32* %0, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; OPT: %[[RET:.*]] = load i32*
+; OPT: ret i32 %[[RET]]
+  %s.addr = alloca i32*, align 8
+  %A.addr = alloca %struct.StructA*, align 8
+  %count.addr = alloca i64, align 8
+  store i32* %s, i32** %s.addr, align 8, !tbaa !0
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load i32** %s.addr, align 8, !tbaa !0
+  store i32 1, i32* %0, align 4, !tbaa !6
+  %1 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %1, i32 0, i32 1
+  store i32 4, i32* %f32, align 4, !tbaa !8
+  %2 = load i32** %s.addr, align 8, !tbaa !0
+  %3 = load i32* %2, align 4, !tbaa !6
+  ret i32 %3
+}
+
+define i32 @_Z2g2PjP7StructAy(i32* %s, %struct.StructA* %A, i64 %count) #0 {
+entry:
+; Access to i32* and &(A->f16).
+; CHECK: Function
+; CHECK: NoAlias:   store i16 4, i16* %f16, align 2, !tbaa !8 <->   store i32 1, i32* %0, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i16 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %s.addr = alloca i32*, align 8
+  %A.addr = alloca %struct.StructA*, align 8
+  %count.addr = alloca i64, align 8
+  store i32* %s, i32** %s.addr, align 8, !tbaa !0
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load i32** %s.addr, align 8, !tbaa !0
+  store i32 1, i32* %0, align 4, !tbaa !6
+  %1 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f16 = getelementptr inbounds %struct.StructA* %1, i32 0, i32 0
+  store i16 4, i16* %f16, align 2, !tbaa !11
+  %2 = load i32** %s.addr, align 8, !tbaa !0
+  %3 = load i32* %2, align 4, !tbaa !6
+  ret i32 %3
+}
+
+define i32 @_Z2g3P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
+entry:
+; Access to &(A->f32) and &(B->a.f32).
+; CHECK: Function
+; CHECK: MayAlias:   store i32 4, i32* %f321, align 4, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; OPT: %[[RET:.*]] = load i32*
+; OPT: ret i32 %[[RET]]
+  %A.addr = alloca %struct.StructA*, align 8
+  %B.addr = alloca %struct.StructB*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !8
+  %1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
+  %a = getelementptr inbounds %struct.StructB* %1, i32 0, i32 1
+  %f321 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 1
+  store i32 4, i32* %f321, align 4, !tbaa !12
+  %2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f322 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
+  %3 = load i32* %f322, align 4, !tbaa !8
+  ret i32 %3
+}
+
+define i32 @_Z2g4P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
+entry:
+; Access to &(A->f32) and &(B->a.f16).
+; CHECK: Function
+; CHECK: NoAlias:   store i16 4, i16* %f16, align 2, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i16 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %A.addr = alloca %struct.StructA*, align 8
+  %B.addr = alloca %struct.StructB*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !8
+  %1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
+  %a = getelementptr inbounds %struct.StructB* %1, i32 0, i32 1
+  %f16 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 0
+  store i16 4, i16* %f16, align 2, !tbaa !14
+  %2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
+  %3 = load i32* %f321, align 4, !tbaa !8
+  ret i32 %3
+}
+
+define i32 @_Z2g5P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
+entry:
+; Access to &(A->f32) and &(B->f32).
+; CHECK: Function
+; CHECK: NoAlias:   store i32 4, i32* %f321, align 4, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %A.addr = alloca %struct.StructA*, align 8
+  %B.addr = alloca %struct.StructB*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !8
+  %1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructB* %1, i32 0, i32 2
+  store i32 4, i32* %f321, align 4, !tbaa !15
+  %2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f322 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
+  %3 = load i32* %f322, align 4, !tbaa !8
+  ret i32 %3
+}
+
+define i32 @_Z2g6P7StructAP7StructBy(%struct.StructA* %A, %struct.StructB* %B, i64 %count) #0 {
+entry:
+; Access to &(A->f32) and &(B->a.f32_2).
+; CHECK: Function
+; CHECK: NoAlias:   store i32 4, i32* %f32_2, align 4, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %A.addr = alloca %struct.StructA*, align 8
+  %B.addr = alloca %struct.StructB*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store %struct.StructB* %B, %struct.StructB** %B.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !8
+  %1 = load %struct.StructB** %B.addr, align 8, !tbaa !0
+  %a = getelementptr inbounds %struct.StructB* %1, i32 0, i32 1
+  %f32_2 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 3
+  store i32 4, i32* %f32_2, align 4, !tbaa !16
+  %2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
+  %3 = load i32* %f321, align 4, !tbaa !8
+  ret i32 %3
+}
+
+define i32 @_Z2g7P7StructAP7StructSy(%struct.StructA* %A, %struct.StructS* %S, i64 %count) #0 {
+entry:
+; Access to &(A->f32) and &(S->f32).
+; CHECK: Function
+; CHECK: NoAlias:   store i32 4, i32* %f321, align 4, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %A.addr = alloca %struct.StructA*, align 8
+  %S.addr = alloca %struct.StructS*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !8
+  %1 = load %struct.StructS** %S.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructS* %1, i32 0, i32 1
+  store i32 4, i32* %f321, align 4, !tbaa !17
+  %2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f322 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
+  %3 = load i32* %f322, align 4, !tbaa !8
+  ret i32 %3
+}
+
+define i32 @_Z2g8P7StructAP7StructSy(%struct.StructA* %A, %struct.StructS* %S, i64 %count) #0 {
+entry:
+; Access to &(A->f32) and &(S->f16).
+; CHECK: Function
+; CHECK: NoAlias:   store i16 4, i16* %f16, align 2, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i16 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %A.addr = alloca %struct.StructA*, align 8
+  %S.addr = alloca %struct.StructS*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructA* %A, %struct.StructA** %A.addr, align 8, !tbaa !0
+  store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructA* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !8
+  %1 = load %struct.StructS** %S.addr, align 8, !tbaa !0
+  %f16 = getelementptr inbounds %struct.StructS* %1, i32 0, i32 0
+  store i16 4, i16* %f16, align 2, !tbaa !19
+  %2 = load %struct.StructA** %A.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructA* %2, i32 0, i32 1
+  %3 = load i32* %f321, align 4, !tbaa !8
+  ret i32 %3
+}
+
+define i32 @_Z2g9P7StructSP8StructS2y(%struct.StructS* %S, %struct.StructS2* %S2, i64 %count) #0 {
+entry:
+; Access to &(S->f32) and &(S2->f32).
+; CHECK: Function
+; CHECK: NoAlias:   store i32 4, i32* %f321, align 4, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %S.addr = alloca %struct.StructS*, align 8
+  %S2.addr = alloca %struct.StructS2*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
+  store %struct.StructS2* %S2, %struct.StructS2** %S2.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructS** %S.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructS* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !17
+  %1 = load %struct.StructS2** %S2.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructS2* %1, i32 0, i32 1
+  store i32 4, i32* %f321, align 4, !tbaa !20
+  %2 = load %struct.StructS** %S.addr, align 8, !tbaa !0
+  %f322 = getelementptr inbounds %struct.StructS* %2, i32 0, i32 1
+  %3 = load i32* %f322, align 4, !tbaa !17
+  ret i32 %3
+}
+
+define i32 @_Z3g10P7StructSP8StructS2y(%struct.StructS* %S, %struct.StructS2* %S2, i64 %count) #0 {
+entry:
+; Access to &(S->f32) and &(S2->f16).
+; CHECK: Function
+; CHECK: NoAlias:   store i16 4, i16* %f16, align 2, !tbaa !10 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i16 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %S.addr = alloca %struct.StructS*, align 8
+  %S2.addr = alloca %struct.StructS2*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructS* %S, %struct.StructS** %S.addr, align 8, !tbaa !0
+  store %struct.StructS2* %S2, %struct.StructS2** %S2.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructS** %S.addr, align 8, !tbaa !0
+  %f32 = getelementptr inbounds %struct.StructS* %0, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !17
+  %1 = load %struct.StructS2** %S2.addr, align 8, !tbaa !0
+  %f16 = getelementptr inbounds %struct.StructS2* %1, i32 0, i32 0
+  store i16 4, i16* %f16, align 2, !tbaa !22
+  %2 = load %struct.StructS** %S.addr, align 8, !tbaa !0
+  %f321 = getelementptr inbounds %struct.StructS* %2, i32 0, i32 1
+  %3 = load i32* %f321, align 4, !tbaa !17
+  ret i32 %3
+}
+
+define i32 @_Z3g11P7StructCP7StructDy(%struct.StructC* %C, %struct.StructD* %D, i64 %count) #0 {
+entry:
+; Access to &(C->b.a.f32) and &(D->b.a.f32).
+; CHECK: Function
+; CHECK: NoAlias:   store i32 4, i32* %f323, align 4, !tbaa !12 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; Remove a load and propogate the value from store.
+; OPT: ret i32 1
+  %C.addr = alloca %struct.StructC*, align 8
+  %D.addr = alloca %struct.StructD*, align 8
+  %count.addr = alloca i64, align 8
+  store %struct.StructC* %C, %struct.StructC** %C.addr, align 8, !tbaa !0
+  store %struct.StructD* %D, %struct.StructD** %D.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructC** %C.addr, align 8, !tbaa !0
+  %b = getelementptr inbounds %struct.StructC* %0, i32 0, i32 1
+  %a = getelementptr inbounds %struct.StructB* %b, i32 0, i32 1
+  %f32 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !23
+  %1 = load %struct.StructD** %D.addr, align 8, !tbaa !0
+  %b1 = getelementptr inbounds %struct.StructD* %1, i32 0, i32 1
+  %a2 = getelementptr inbounds %struct.StructB* %b1, i32 0, i32 1
+  %f323 = getelementptr inbounds %struct.StructA* %a2, i32 0, i32 1
+  store i32 4, i32* %f323, align 4, !tbaa !25
+  %2 = load %struct.StructC** %C.addr, align 8, !tbaa !0
+  %b4 = getelementptr inbounds %struct.StructC* %2, i32 0, i32 1
+  %a5 = getelementptr inbounds %struct.StructB* %b4, i32 0, i32 1
+  %f326 = getelementptr inbounds %struct.StructA* %a5, i32 0, i32 1
+  %3 = load i32* %f326, align 4, !tbaa !23
+  ret i32 %3
+}
+
+define i32 @_Z3g12P7StructCP7StructDy(%struct.StructC* %C, %struct.StructD* %D, i64 %count) #0 {
+entry:
+; Access to &(b1->a.f32) and &(b2->a.f32).
+; CHECK: Function
+; CHECK: MayAlias:   store i32 4, i32* %f325, align 4, !tbaa !6 <->   store i32 1, i32* %f32, align 4, !tbaa !6
+; OPT: define
+; OPT: store i32 1
+; OPT: store i32 4
+; OPT: %[[RET:.*]] = load i32*
+; OPT: ret i32 %[[RET]]
+  %C.addr = alloca %struct.StructC*, align 8
+  %D.addr = alloca %struct.StructD*, align 8
+  %count.addr = alloca i64, align 8
+  %b1 = alloca %struct.StructB*, align 8
+  %b2 = alloca %struct.StructB*, align 8
+  store %struct.StructC* %C, %struct.StructC** %C.addr, align 8, !tbaa !0
+  store %struct.StructD* %D, %struct.StructD** %D.addr, align 8, !tbaa !0
+  store i64 %count, i64* %count.addr, align 8, !tbaa !4
+  %0 = load %struct.StructC** %C.addr, align 8, !tbaa !0
+  %b = getelementptr inbounds %struct.StructC* %0, i32 0, i32 1
+  store %struct.StructB* %b, %struct.StructB** %b1, align 8, !tbaa !0
+  %1 = load %struct.StructD** %D.addr, align 8, !tbaa !0
+  %b3 = getelementptr inbounds %struct.StructD* %1, i32 0, i32 1
+  store %struct.StructB* %b3, %struct.StructB** %b2, align 8, !tbaa !0
+  %2 = load %struct.StructB** %b1, align 8, !tbaa !0
+  %a = getelementptr inbounds %struct.StructB* %2, i32 0, i32 1
+  %f32 = getelementptr inbounds %struct.StructA* %a, i32 0, i32 1
+  store i32 1, i32* %f32, align 4, !tbaa !12
+  %3 = load %struct.StructB** %b2, align 8, !tbaa !0
+  %a4 = getelementptr inbounds %struct.StructB* %3, i32 0, i32 1
+  %f325 = getelementptr inbounds %struct.StructA* %a4, i32 0, i32 1
+  store i32 4, i32* %f325, align 4, !tbaa !12
+  %4 = load %struct.StructB** %b1, align 8, !tbaa !0
+  %a6 = getelementptr inbounds %struct.StructB* %4, i32 0, i32 1
+  %f327 = getelementptr inbounds %struct.StructA* %a6, i32 0, i32 1
+  %5 = load i32* %f327, align 4, !tbaa !12
+  ret i32 %5
+}
+
+attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!0 = metadata !{metadata !1, metadata !1, i64 0}
+!1 = metadata !{metadata !"any pointer", i64 0, metadata !2}
+!2 = metadata !{metadata !"omnipotent char", i64 0, metadata !3}
+!3 = metadata !{metadata !"Simple C/C++ TBAA"}
+!4 = metadata !{metadata !5, metadata !5, i64 0}
+!5 = metadata !{metadata !"long long", i64 0, metadata !2}
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