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https://github.com/RPCS3/llvm-mirror.git
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0c51903724
There are cases when two tags with different base types denote accesses to the same direct or indirect member of a structure type. Currently, merging of such tags results in a tag that represents an access to an object that has the type of that member. This patch changes this so that if one of the accesses encloses the other, then the generic tag is the one of the enclosed access. Differential Revision: https://reviews.llvm.org/D39557 llvm-svn: 321019
149 lines
4.1 KiB
LLVM
149 lines
4.1 KiB
LLVM
; RUN: opt -tbaa -basicaa -gvn -S < %s | FileCheck %s
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define i32 @test1(i8* %p, i8* %q) {
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; CHECK-LABEL: @test1(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p)
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; CHECK-NOT: tbaa
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !0
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%b = call i32 @foo(i8* %p)
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test2(i8* %p, i8* %q) {
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; CHECK-LABEL: @test2(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p), !tbaa [[TAGC:!.*]]
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !0
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%b = call i32 @foo(i8* %p), !tbaa !0
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test3(i8* %p, i8* %q) {
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; CHECK-LABEL: @test3(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p), !tbaa [[TAGB:!.*]]
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !3
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%b = call i32 @foo(i8* %p), !tbaa !3
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test4(i8* %p, i8* %q) {
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; CHECK-LABEL: @test4(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p), !tbaa [[TAGA:!.*]]
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !1
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%b = call i32 @foo(i8* %p), !tbaa !0
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test5(i8* %p, i8* %q) {
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; CHECK-LABEL: @test5(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p), !tbaa [[TAGA]]
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !0
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%b = call i32 @foo(i8* %p), !tbaa !1
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test6(i8* %p, i8* %q) {
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; CHECK-LABEL: @test6(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p), !tbaa [[TAGA]]
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !0
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%b = call i32 @foo(i8* %p), !tbaa !3
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test7(i8* %p, i8* %q) {
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; CHECK-LABEL: @test7(i8* %p, i8* %q)
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; CHECK: call i32 @foo(i8* %p)
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; CHECK-NOT: tbaa
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !4
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%b = call i32 @foo(i8* %p), !tbaa !3
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%c = add i32 %a, %b
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ret i32 %c
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}
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define i32 @test8(i32* %p, i32* %q) {
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; CHECK-LABEL: @test8
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; CHECK-NEXT: store i32 15, i32* %p
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; CHECK-NEXT: ret i32 0
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; Since we know the location is invariant, we can forward the
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; load across the potentially aliasing store.
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%a = load i32, i32* %q, !tbaa !10
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store i32 15, i32* %p
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%b = load i32, i32* %q, !tbaa !10
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%c = sub i32 %a, %b
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ret i32 %c
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}
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define i32 @test9(i32* %p, i32* %q) {
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; CHECK-LABEL: @test9
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; CHECK-NEXT: call void @clobber()
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; CHECK-NEXT: ret i32 0
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; Since we know the location is invariant, we can forward the
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; load across the potentially aliasing store (within the call).
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%a = load i32, i32* %q, !tbaa !10
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call void @clobber()
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%b = load i32, i32* %q, !tbaa !10
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%c = sub i32 %a, %b
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ret i32 %c
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}
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define i32 @test10(i8* %p, i8* %q) {
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; If one access encloses the other, then the merged access is the enclosed one
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; and not just the common final access type.
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; CHECK-LABEL: @test10
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; CHECK: call i32 @foo(i8* %p), !tbaa [[TAG_X_i:!.*]]
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; CHECK: %c = add i32 %a, %a
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%a = call i32 @foo(i8* %p), !tbaa !15 ; TAG_X_i
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%b = call i32 @foo(i8* %p), !tbaa !19 ; TAG_Y_x_i
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%c = add i32 %a, %b
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ret i32 %c
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}
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declare void @clobber()
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declare i32 @foo(i8*) readonly
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; CHECK-DAG: [[TAGC]] = !{[[TYPEC:!.*]], [[TYPEC]], i64 0}
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; CHECK-DAG: [[TYPEC]] = !{!"C", [[TYPEA:!.*]]}
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; CHECK-DAG: [[TYPEA]] = !{!"A", !{{.*}}}
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; CHECK-DAG: [[TAGB]] = !{[[TYPEB:!.*]], [[TYPEB]], i64 0}
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; CHECK-DAG: [[TYPEB]] = !{!"B", [[TYPEA]]}
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; CHECK-DAG: [[TAGA]] = !{[[TYPEA]], [[TYPEA]], i64 0}
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!0 = !{!5, !5, i64 0}
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!1 = !{!6, !6, i64 0}
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!2 = !{!"tbaa root"}
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!3 = !{!7, !7, i64 0}
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!4 = !{!11, !11, i64 0}
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!5 = !{!"C", !6}
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!6 = !{!"A", !2}
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!7 = !{!"B", !6}
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!8 = !{!"another root"}
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!11 = !{!"scalar type", !8}
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; CHECK-DAG: [[TAG_X_i]] = !{[[TYPE_X:!.*]], [[TYPE_int:!.*]], i64 0}
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; CHECK-DAG: [[TYPE_X:!.*]] = !{!"struct X", [[TYPE_int]], i64 0}
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; CHECK-DAG: [[TYPE_int]] = !{!"int", {{!.*}}, i64 0}
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!15 = !{!16, !17, i64 0} ; TAG_X_i
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!16 = !{!"struct X", !17, i64 0} ; struct X { int i; };
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!17 = !{!"int", !18, i64 0}
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!18 = !{!"char", !2, i64 0}
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!19 = !{!20, !17, i64 0} ; TAG_Y_x_i
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!20 = !{!"struct Y", !16, i64 0} ; struct Y { struct X x; };
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; A TBAA structure who's only point is to have a constant location.
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!9 = !{!"yet another root"}
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!10 = !{!"node", !9, i64 1}
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