forked from OSchip/llvm-project
319 lines
7.8 KiB
LLVM
319 lines
7.8 KiB
LLVM
; RUN: opt < %s -inline-threshold=0 -always-inline -S | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CALL
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;
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; Ensure the threshold has no impact on these decisions.
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; RUN: opt < %s -inline-threshold=20000000 -always-inline -S | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CALL
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; RUN: opt < %s -inline-threshold=-20000000 -always-inline -S | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-CALL
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;
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; The new pass manager doesn't re-use any threshold based infrastructure for
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; the always inliner, but test that we get the correct result. The new PM
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; always inliner also doesn't support inlining call-site alwaysinline
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; annotations. It isn't clear that this is a reasonable use case for
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; 'alwaysinline'.
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; RUN: opt < %s -passes=always-inline -S | FileCheck %s --check-prefix=CHECK
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define internal i32 @inner1() alwaysinline {
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; CHECK-NOT: @inner1(
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ret i32 1
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}
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define i32 @outer1() {
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; CHECK-LABEL: @outer1(
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; CHECK-NOT: call
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; CHECK: ret
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%r = call i32 @inner1()
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ret i32 %r
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}
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; The always inliner can't DCE arbitrary internal functions. PR2945
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define internal i32 @pr2945() nounwind {
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; CHECK-LABEL: @pr2945(
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ret i32 0
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}
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define internal void @inner2(i32 %N) alwaysinline {
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; CHECK-NOT: @inner2(
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%P = alloca i32, i32 %N
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ret void
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}
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define void @outer2(i32 %N) {
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; The always inliner (unlike the normal one) should be willing to inline
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; a function with a dynamic alloca into one without a dynamic alloca.
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; rdar://6655932
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;
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; CHECK-LABEL: @outer2(
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; CHECK-NOT: call void @inner2
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; CHECK-NOT: call void @inner2
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; CHECK: ret void
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call void @inner2( i32 %N )
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ret void
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}
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declare i32 @a() returns_twice
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declare i32 @b() returns_twice
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; Cannot alwaysinline when that would introduce a returns_twice call.
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define internal i32 @inner3() alwaysinline {
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; CHECK-LABEL: @inner3(
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entry:
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%call = call i32 @a() returns_twice
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%add = add nsw i32 1, %call
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ret i32 %add
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}
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define i32 @outer3() {
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entry:
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; CHECK-LABEL: @outer3(
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; CHECK-NOT: call i32 @a
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; CHECK: ret
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%call = call i32 @inner3()
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%add = add nsw i32 1, %call
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ret i32 %add
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}
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define internal i32 @inner4() alwaysinline returns_twice {
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; CHECK-NOT: @inner4(
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entry:
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%call = call i32 @b() returns_twice
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%add = add nsw i32 1, %call
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ret i32 %add
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}
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define i32 @outer4() {
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entry:
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; CHECK-LABEL: @outer4(
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; CHECK: call i32 @b()
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; CHECK: ret
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%call = call i32 @inner4() returns_twice
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%add = add nsw i32 1, %call
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ret i32 %add
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}
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; We can't inline this even though it has alwaysinline!
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define internal i32 @inner5(i8* %addr) alwaysinline {
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; CHECK-LABEL: @inner5(
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entry:
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indirectbr i8* %addr, [ label %one, label %two ]
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one:
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ret i32 42
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two:
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ret i32 44
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}
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define i32 @outer5(i32 %x) {
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; CHECK-LABEL: @outer5(
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; CHECK: call i32 @inner5
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; CHECK: ret
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%cmp = icmp slt i32 %x, 42
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%addr = select i1 %cmp, i8* blockaddress(@inner5, %one), i8* blockaddress(@inner5, %two)
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%call = call i32 @inner5(i8* %addr)
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ret i32 %call
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}
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; We alwaysinline a function that call itself recursively.
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define internal void @inner6(i32 %x) alwaysinline {
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; CHECK-LABEL: @inner6(
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entry:
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%icmp = icmp slt i32 %x, 0
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br i1 %icmp, label %return, label %bb
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bb:
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%sub = sub nsw i32 %x, 1
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call void @inner6(i32 %sub)
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ret void
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return:
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ret void
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}
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define void @outer6() {
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; CHECK-LABEL: @outer6(
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; CHECK: call void @inner6(i32 42)
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; CHECK: ret
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entry:
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call void @inner6(i32 42)
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ret void
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}
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; This is not an alwaysinline function and is actually external.
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define i32 @inner7() {
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; CHECK-LABEL: @inner7(
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ret i32 1
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}
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define i32 @outer7() {
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; CHECK-CALL-LABEL: @outer7(
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; CHECK-CALL-NOT: call
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; CHECK-CALL: ret
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%r = call i32 @inner7() alwaysinline
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ret i32 %r
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}
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define internal float* @inner8(float* nocapture align 128 %a) alwaysinline {
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; CHECK-NOT: @inner8(
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ret float* %a
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}
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define float @outer8(float* nocapture %a) {
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; CHECK-LABEL: @outer8(
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; CHECK-NOT: call float* @inner8
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; CHECK: ret
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%inner_a = call float* @inner8(float* %a)
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%f = load float, float* %inner_a, align 4
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ret float %f
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}
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; The 'inner9*' and 'outer9' functions are designed to check that we remove
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; a function that is inlined by the always inliner even when it is used by
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; a complex constant expression prior to being inlined.
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; The 'a' function gets used in a complex constant expression that, despite
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; being constant folded, means it isn't dead. As a consequence it shouldn't be
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; deleted. If it is, then the constant expression needs to become more complex
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; to accurately test this scenario.
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define internal void @inner9a(i1 %b) alwaysinline {
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; CHECK-LABEL: @inner9a(
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entry:
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ret void
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}
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define internal void @inner9b(i1 %b) alwaysinline {
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; CHECK-NOT: @inner9b(
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entry:
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ret void
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}
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declare void @dummy9(i1 %b)
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define void @outer9() {
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; CHECK-LABEL: @outer9(
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entry:
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; First we use @inner9a in a complex constant expression that may get folded
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; but won't get removed, and then we call it which will get inlined. Despite
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; this the function can't be deleted because of the constant expression
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; usage.
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%sink = alloca i1
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store volatile i1 icmp eq (i64 ptrtoint (void (i1)* @inner9a to i64), i64 ptrtoint(void (i1)* @dummy9 to i64)), i1* %sink
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; CHECK: store volatile
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call void @inner9a(i1 false)
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; CHECK-NOT: call void @inner9a
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; Next we call @inner9b passing in a constant expression. This constant
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; expression will in fact be removed by inlining, so we should also be able
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; to delete the function.
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call void @inner9b(i1 icmp eq (i64 ptrtoint (void (i1)* @inner9b to i64), i64 ptrtoint(void (i1)* @dummy9 to i64)))
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; CHECK-NOT: @inner9b
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ret void
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; CHECK: ret void
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}
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; The 'inner10' and 'outer10' functions test a frustrating consequence of the
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; current 'alwaysinline' semantic model. Because such functions are allowed to
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; be external functions, it may be necessary to both inline all of their uses
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; and leave them in the final output. These tests can be removed if and when
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; we restrict alwaysinline further.
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define void @inner10() alwaysinline {
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; CHECK-LABEL: @inner10(
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entry:
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ret void
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}
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define void @outer10() {
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; CHECK-LABEL: @outer10(
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entry:
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call void @inner10()
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; CHECK-NOT: call void @inner10
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ret void
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; CHECK: ret void
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}
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; The 'inner11' and 'outer11' functions test another dimension of non-internal
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; functions with alwaysinline. These functions use external linkages that we can
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; actually remove safely and so we should.
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define linkonce void @inner11a() alwaysinline {
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; CHECK-NOT: @inner11a(
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entry:
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ret void
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}
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define available_externally void @inner11b() alwaysinline {
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; CHECK-NOT: @inner11b(
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entry:
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ret void
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}
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define void @outer11() {
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; CHECK-LABEL: @outer11(
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entry:
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call void @inner11a()
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call void @inner11b()
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; CHECK-NOT: call void @inner11a
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; CHECK-NOT: call void @inner11b
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ret void
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; CHECK: ret void
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}
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; The 'inner12' and 'outer12' functions test that we don't remove functions
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; which are part of a comdat group even if they otherwise seem dead.
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$comdat12 = comdat any
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define linkonce void @inner12() alwaysinline comdat($comdat12) {
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; CHECK-LABEL: @inner12(
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ret void
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}
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define void @outer12() comdat($comdat12) {
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; CHECK-LABEL: @outer12(
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entry:
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call void @inner12()
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; CHECK-NOT: call void @inner12
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ret void
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; CHECK: ret void
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}
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; The 'inner13*' and 'outer13' functions test that we do remove functions
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; which are part of a comdat group where all of the members are removed during
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; always inlining.
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$comdat13 = comdat any
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define linkonce void @inner13a() alwaysinline comdat($comdat13) {
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; CHECK-NOT: @inner13a(
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ret void
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}
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define linkonce void @inner13b() alwaysinline comdat($comdat13) {
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; CHECK-NOT: @inner13b(
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ret void
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}
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define void @outer13() {
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; CHECK-LABEL: @outer13(
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entry:
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call void @inner13a()
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call void @inner13b()
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; CHECK-NOT: call void @inner13a
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; CHECK-NOT: call void @inner13b
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ret void
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; CHECK: ret void
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}
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define void @inner14() readnone nounwind {
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; CHECK: define void @inner14
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ret void
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}
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define void @outer14() {
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; CHECK: call void @inner14
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call void @inner14()
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ret void
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}
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