-; A very rudimentary test on AliasAnalysis::getModRefInfo.
-; RUN: opt %s -print-all-alias-modref-info -aa-eval -disable-output |& \
-; RUN: not grep NoModRef
+; RUN: opt < %s -basicaa -gvn -dse -S | FileCheck %s
+target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
-define i32 @callee() {
- %X = alloca { i32, i32 } ; <{ i32, i32 }*> [#uses=1]
- %Y = getelementptr { i32, i32 }* %X, i64 0, i32 0 ; <i32*> [#uses=1]
- %Z = load i32* %Y ; <i32> [#uses=1]
- ret i32 %Z
+declare void @llvm.memset.i32(i8*, i8, i32, i32)
+declare void @llvm.memset.i8(i8*, i8, i8, i32)
+declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
+declare void @llvm.memcpy.i32(i8*, i8*, i32, i32)
+declare void @llvm.lifetime.end(i64, i8* nocapture)
+
+declare void @external(i32*)
+
+define i32 @test0(i8* %P) {
+ %A = alloca i32
+ call void @external(i32* %A)
+
+ store i32 0, i32* %A
+
+ call void @llvm.memset.i32(i8* %P, i8 0, i32 42, i32 1)
+
+ %B = load i32* %A
+ ret i32 %B
+
+; CHECK: @test0
+; CHECK: ret i32 0
+}
+
+declare void @llvm.memcpy.i8(i8*, i8*, i8, i32)
+
+define i8 @test1() {
+; CHECK: @test1
+ %A = alloca i8
+ %B = alloca i8
+
+ store i8 2, i8* %B ;; Not written to by memcpy
+
+ call void @llvm.memcpy.i8(i8* %A, i8* %B, i8 -1, i32 0)
+
+ %C = load i8* %B
+ ret i8 %C
+; CHECK: ret i8 2
+}
+
+define i8 @test2(i8* %P) {
+; CHECK: @test2
+ %P2 = getelementptr i8* %P, i32 127
+ store i8 1, i8* %P2 ;; Not dead across memset
+ call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
+ %A = load i8* %P2
+ ret i8 %A
+; CHECK: ret i8 1
+}
+
+define i8 @test2a(i8* %P) {
+; CHECK: @test2
+ %P2 = getelementptr i8* %P, i32 126
+
+ ;; FIXME: DSE isn't zapping this dead store.
+ store i8 1, i8* %P2 ;; Dead, clobbered by memset.
+
+ call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
+ %A = load i8* %P2
+ ret i8 %A
+; CHECK-NOT: load
+; CHECK: ret i8 2
+}
+
+define void @test3(i8* %P, i8 %X) {
+; CHECK: @test3
+; CHECK-NOT: store
+; CHECK-NOT: %Y
+ %Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
+
+ %P2 = getelementptr i8* %P, i32 2
+ store i8 %Y, i8* %P2 ;; Not read by lifetime.end, should be removed.
+; CHECK: store i8 2, i8* %P2
+ call void @llvm.lifetime.end(i64 1, i8* %P)
+ store i8 2, i8* %P2
+; CHECK-NOT: store
+ ret void
+; CHECK: ret void
+}
+
+define void @test3a(i8* %P, i8 %X) {
+; CHECK: @test3a
+ %Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
+
+ %P2 = getelementptr i8* %P, i32 2
+ store i8 %Y, i8* %P2
+; CHECK-NEXT: call void @llvm.lifetime.end
+ call void @llvm.lifetime.end(i64 10, i8* %P)
+ ret void
+; CHECK-NEXT: ret void
+}
+
+@G1 = external global i32
+@G2 = external global [4000 x i32]
+
+define i32 @test4(i8* %P) {
+ %tmp = load i32* @G1
+ call void @llvm.memset.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8 0, i32 4000, i32 1)
+ %tmp2 = load i32* @G1
+ %sub = sub i32 %tmp2, %tmp
+ ret i32 %sub
+; CHECK: @test4
+; CHECK: load i32* @G
+; CHECK: memset.p0i8.i32
+; CHECK-NOT: load
+; CHECK: sub i32 %tmp, %tmp
+}
+
+; Verify that basicaa is handling variable length memcpy, knowing it doesn't
+; write to G1.
+define i32 @test5(i8* %P, i32 %Len) {
+ %tmp = load i32* @G1
+ call void @llvm.memcpy.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8* bitcast (i32* @G1 to i8*), i32 %Len, i32 1)
+ %tmp2 = load i32* @G1
+ %sub = sub i32 %tmp2, %tmp
+ ret i32 %sub
+; CHECK: @test5
+; CHECK: load i32* @G
+; CHECK: memcpy.p0i8.p0i8.i32
+; CHECK-NOT: load
+; CHECK: sub i32 %tmp, %tmp
}
-define i32 @caller() {
- %X = call i32 @callee( ) ; <i32> [#uses=1]
- ret i32 %X
+define i8 @test6(i8* %p, i8* noalias %a) {
+ %x = load i8* %a
+ %t = va_arg i8* %p, float
+ %y = load i8* %a
+ %z = add i8 %x, %y
+ ret i8 %z
+; CHECK: @test6
+; CHECK: load i8* %a
+; CHECK-NOT: load
+; CHECK: ret
}