Add coverage of GlobalsModRef's indirect global case

Author: preames

llvm/test/Analysis/GlobalsModRef/indirect-global.ll

@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -basic-aa -globals-aa -gvn -instcombine -S -enable-unsafe-globalsmodref-alias-results | FileCheck %s
 ; RUN: opt < %s -aa-pipeline=basic-aa,globals-aa -passes="require<globals-aa>,function(gvn,instcombine)" -S -enable-unsafe-globalsmodref-alias-results | FileCheck %s
 ;
@@ -7,20 +8,90 @@
 @G = internal global i32* null		; <i32**> [#uses=3]
 
 declare i8* @malloc(i32)
-define void @test() {
-	%a = call i8* @malloc(i32 4)
-        %A = bitcast i8* %a to i32*
-	store i32* %A, i32** @G
-	ret void
+define void @malloc_init() {
+; CHECK-LABEL: @malloc_init(
+; CHECK-NEXT:    [[A:%.*]] = call dereferenceable_or_null(4) i8* @malloc(i32 4)
+; CHECK-NEXT:    store i8* [[A]], i8** bitcast (i32** @G to i8**), align 8
+; CHECK-NEXT:    ret void
+;
+  %a = call i8* @malloc(i32 4)
+  %A = bitcast i8* %a to i32*
+  store i32* %A, i32** @G
+  ret void
+}
+
+define i32 @malloc_test(i32* %P) {
+; CHECK-LABEL: @malloc_test(
+; CHECK-NEXT:    store i32 123, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    ret i32 0
+;
+  %g1 = load i32*, i32** @G		; <i32*> [#uses=2]
+  %h1 = load i32, i32* %g1		; <i32> [#uses=1]
+  store i32 123, i32* %P
+  %g2 = load i32*, i32** @G		; <i32*> [#uses=0]
+  %h2 = load i32, i32* %g1		; <i32> [#uses=1]
+  %X = sub i32 %h1, %h2		; <i32> [#uses=1]
+  ret i32 %X
+}
+
+@G2 = internal global i32* null		; <i32**> [#uses=3]
+
+declare i8* @calloc(i32, i32)
+define void @calloc_init() {
+; CHECK-LABEL: @calloc_init(
+; CHECK-NEXT:    [[A:%.*]] = call dereferenceable_or_null(4) i8* @calloc(i32 4, i32 1)
+; CHECK-NEXT:    store i8* [[A]], i8** bitcast (i32** @G2 to i8**), align 8
+; CHECK-NEXT:    ret void
+;
+  %a = call i8* @calloc(i32 4, i32 1)
+  %A = bitcast i8* %a to i32*
+  store i32* %A, i32** @G2
+  ret void
 }
 
-define i32 @test1(i32* %P) {
-; CHECK: ret i32 0
-	%g1 = load i32*, i32** @G		; <i32*> [#uses=2]
-	%h1 = load i32, i32* %g1		; <i32> [#uses=1]
-	store i32 123, i32* %P
-	%g2 = load i32*, i32** @G		; <i32*> [#uses=0]
-	%h2 = load i32, i32* %g1		; <i32> [#uses=1]
-	%X = sub i32 %h1, %h2		; <i32> [#uses=1]
-	ret i32 %X
+define i32 @calloc_test(i32* %P) {
+; CHECK-LABEL: @calloc_test(
+; CHECK-NEXT:    store i32 123, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    ret i32 0
+;
+  %g1 = load i32*, i32** @G2		; <i32*> [#uses=2]
+  %h1 = load i32, i32* %g1		; <i32> [#uses=1]
+  store i32 123, i32* %P
+  %g2 = load i32*, i32** @G2		; <i32*> [#uses=0]
+  %h2 = load i32, i32* %g1		; <i32> [#uses=1]
+  %X = sub i32 %h1, %h2		; <i32> [#uses=1]
+  ret i32 %X
+}
+
+@G3 = internal global i32* null		; <i32**> [#uses=3]
+
+declare noalias i8* @my_alloc(i32)
+define void @my_alloc_init() {
+; CHECK-LABEL: @my_alloc_init(
+; CHECK-NEXT:    [[A:%.*]] = call i8* @my_alloc(i32 4)
+; CHECK-NEXT:    store i8* [[A]], i8** bitcast (i32** @G3 to i8**), align 8
+; CHECK-NEXT:    ret void
+;
+  %a = call i8* @my_alloc(i32 4)
+  %A = bitcast i8* %a to i32*
+  store i32* %A, i32** @G3
+  ret void
+}
+
+define i32 @my_alloc_test(i32* %P) {
+; CHECK-LABEL: @my_alloc_test(
+; CHECK-NEXT:    [[G1:%.*]] = load i32*, i32** @G3, align 8
+; CHECK-NEXT:    [[H1:%.*]] = load i32, i32* [[G1]], align 4
+; CHECK-NEXT:    store i32 123, i32* [[P:%.*]], align 4
+; CHECK-NEXT:    [[H2:%.*]] = load i32, i32* [[G1]], align 4
+; CHECK-NEXT:    [[X:%.*]] = sub i32 [[H1]], [[H2]]
+; CHECK-NEXT:    ret i32 [[X]]
+;
+  %g1 = load i32*, i32** @G3		; <i32*> [#uses=2]
+  %h1 = load i32, i32* %g1		; <i32> [#uses=1]
+  store i32 123, i32* %P
+  %g2 = load i32*, i32** @G3		; <i32*> [#uses=0]
+  %h2 = load i32, i32* %g1		; <i32> [#uses=1]
+  %X = sub i32 %h1, %h2		; <i32> [#uses=1]
+  ret i32 %X
 }