458 lines
15 KiB
LLVM
458 lines
15 KiB
LLVM
; RUN: opt < %s -gvn -S | FileCheck %s
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%struct.A = type { i32 (...)** }
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@_ZTV1A = available_externally unnamed_addr constant [3 x i8*] [i8* null, i8* bitcast (i8** @_ZTI1A to i8*), i8* bitcast (void (%struct.A*)* @_ZN1A3fooEv to i8*)], align 8
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@_ZTI1A = external constant i8*
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@unknownPtr = external global i8
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; CHECK-LABEL: define i8 @simple() {
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define i8 @simple() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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call void @foo(i8* %ptr)
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%a = load i8, i8* %ptr, !invariant.group !0
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%b = load i8, i8* %ptr, !invariant.group !0
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%c = load i8, i8* %ptr, !invariant.group !0
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; CHECK: ret i8 42
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @optimizable1() {
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define i8 @optimizable1() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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%ptr2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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%a = load i8, i8* %ptr, !invariant.group !0
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call void @foo(i8* %ptr2); call to use %ptr2
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; CHECK: ret i8 42
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @optimizable2() {
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define i8 @optimizable2() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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call void @foo(i8* %ptr)
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store i8 13, i8* %ptr ; can't use this store with invariant.group
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%a = load i8, i8* %ptr
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call void @bar(i8 %a) ; call to use %a
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call void @foo(i8* %ptr)
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%b = load i8, i8* %ptr, !invariant.group !0
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; CHECK: ret i8 42
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ret i8 %b
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}
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; CHECK-LABEL: define i1 @proveEqualityForStrip(
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define i1 @proveEqualityForStrip(i8* %a) {
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; FIXME: The first call could be also removed by GVN. Right now
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; DCE removes it. The second call is CSE'd with the first one.
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; CHECK: %b1 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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%b1 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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; CHECK-NOT: llvm.strip.invariant.group
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%b2 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* %b1, %b2
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; CHECK: ret i1 true
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ret i1 %r
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}
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; CHECK-LABEL: define i8 @unoptimizable1() {
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define i8 @unoptimizable1() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr
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call void @foo(i8* %ptr)
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%a = load i8, i8* %ptr, !invariant.group !0
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; CHECK: ret i8 %a
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ret i8 %a
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}
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; CHECK-LABEL: define void @indirectLoads() {
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define void @indirectLoads() {
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entry:
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%a = alloca %struct.A*, align 8
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%0 = bitcast %struct.A** %a to i8*
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%call = call i8* @getPointer(i8* null)
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%1 = bitcast i8* %call to %struct.A*
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call void @_ZN1AC1Ev(%struct.A* %1)
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%2 = bitcast %struct.A* %1 to i8***
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; CHECK: %vtable = load {{.*}} !invariant.group
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%vtable = load i8**, i8*** %2, align 8, !invariant.group !0
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%cmp.vtables = icmp eq i8** %vtable, getelementptr inbounds ([3 x i8*], [3 x i8*]* @_ZTV1A, i64 0, i64 2)
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call void @llvm.assume(i1 %cmp.vtables)
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store %struct.A* %1, %struct.A** %a, align 8
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%3 = load %struct.A*, %struct.A** %a, align 8
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%4 = bitcast %struct.A* %3 to void (%struct.A*)***
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; CHECK: call void @_ZN1A3fooEv(
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%vtable1 = load void (%struct.A*)**, void (%struct.A*)*** %4, align 8, !invariant.group !0
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%vfn = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** %vtable1, i64 0
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%5 = load void (%struct.A*)*, void (%struct.A*)** %vfn, align 8
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call void %5(%struct.A* %3)
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%6 = load %struct.A*, %struct.A** %a, align 8
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%7 = bitcast %struct.A* %6 to void (%struct.A*)***
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; CHECK: call void @_ZN1A3fooEv(
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%vtable2 = load void (%struct.A*)**, void (%struct.A*)*** %7, align 8, !invariant.group !0
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%vfn3 = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** %vtable2, i64 0
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%8 = load void (%struct.A*)*, void (%struct.A*)** %vfn3, align 8
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call void %8(%struct.A* %6)
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%9 = load %struct.A*, %struct.A** %a, align 8
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%10 = bitcast %struct.A* %9 to void (%struct.A*)***
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%vtable4 = load void (%struct.A*)**, void (%struct.A*)*** %10, align 8, !invariant.group !0
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%vfn5 = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** %vtable4, i64 0
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%11 = load void (%struct.A*)*, void (%struct.A*)** %vfn5, align 8
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; CHECK: call void @_ZN1A3fooEv(
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call void %11(%struct.A* %9)
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%vtable5 = load i8**, i8*** %2, align 8, !invariant.group !0
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%vfn6 = getelementptr inbounds i8*, i8** %vtable5, i64 0
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%12 = bitcast i8** %vfn6 to void (%struct.A*)**
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%13 = load void (%struct.A*)*, void (%struct.A*)** %12, align 8
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; CHECK: call void @_ZN1A3fooEv(
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call void %13(%struct.A* %9)
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ret void
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}
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; CHECK-LABEL: define void @combiningBitCastWithLoad() {
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define void @combiningBitCastWithLoad() {
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entry:
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%a = alloca %struct.A*, align 8
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%0 = bitcast %struct.A** %a to i8*
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%call = call i8* @getPointer(i8* null)
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%1 = bitcast i8* %call to %struct.A*
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call void @_ZN1AC1Ev(%struct.A* %1)
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%2 = bitcast %struct.A* %1 to i8***
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; CHECK: %vtable = load {{.*}} !invariant.group
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%vtable = load i8**, i8*** %2, align 8, !invariant.group !0
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%cmp.vtables = icmp eq i8** %vtable, getelementptr inbounds ([3 x i8*], [3 x i8*]* @_ZTV1A, i64 0, i64 2)
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store %struct.A* %1, %struct.A** %a, align 8
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; CHECK-NOT: !invariant.group
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%3 = load %struct.A*, %struct.A** %a, align 8
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%4 = bitcast %struct.A* %3 to void (%struct.A*)***
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%vtable1 = load void (%struct.A*)**, void (%struct.A*)*** %4, align 8, !invariant.group !0
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%vfn = getelementptr inbounds void (%struct.A*)*, void (%struct.A*)** %vtable1, i64 0
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%5 = load void (%struct.A*)*, void (%struct.A*)** %vfn, align 8
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call void %5(%struct.A* %3)
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ret void
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}
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; CHECK-LABEL:define void @loadCombine() {
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define void @loadCombine() {
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enter:
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%ptr = alloca i8
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store i8 42, i8* %ptr
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call void @foo(i8* %ptr)
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; CHECK: %[[A:.*]] = load i8, i8* %ptr, !invariant.group
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%a = load i8, i8* %ptr, !invariant.group !0
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; CHECK-NOT: load
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%b = load i8, i8* %ptr, !invariant.group !0
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; CHECK: call void @bar(i8 %[[A]])
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call void @bar(i8 %a)
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; CHECK: call void @bar(i8 %[[A]])
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call void @bar(i8 %b)
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ret void
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}
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; CHECK-LABEL: define void @loadCombine1() {
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define void @loadCombine1() {
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enter:
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%ptr = alloca i8
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store i8 42, i8* %ptr
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call void @foo(i8* %ptr)
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; CHECK: %[[D:.*]] = load i8, i8* %ptr, !invariant.group
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%c = load i8, i8* %ptr
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; CHECK-NOT: load
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%d = load i8, i8* %ptr, !invariant.group !0
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; CHECK: call void @bar(i8 %[[D]])
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call void @bar(i8 %c)
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; CHECK: call void @bar(i8 %[[D]])
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call void @bar(i8 %d)
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ret void
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}
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; CHECK-LABEL: define void @loadCombine2() {
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define void @loadCombine2() {
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enter:
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%ptr = alloca i8
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store i8 42, i8* %ptr
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call void @foo(i8* %ptr)
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; CHECK: %[[E:.*]] = load i8, i8* %ptr, !invariant.group
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%e = load i8, i8* %ptr, !invariant.group !0
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; CHECK-NOT: load
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%f = load i8, i8* %ptr
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; CHECK: call void @bar(i8 %[[E]])
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call void @bar(i8 %e)
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; CHECK: call void @bar(i8 %[[E]])
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call void @bar(i8 %f)
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ret void
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}
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; CHECK-LABEL: define void @loadCombine3() {
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define void @loadCombine3() {
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enter:
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%ptr = alloca i8
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store i8 42, i8* %ptr
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call void @foo(i8* %ptr)
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; CHECK: %[[E:.*]] = load i8, i8* %ptr, !invariant.group
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%e = load i8, i8* %ptr, !invariant.group !0
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; CHECK-NOT: load
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%f = load i8, i8* %ptr, !invariant.group !0
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; CHECK: call void @bar(i8 %[[E]])
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call void @bar(i8 %e)
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; CHECK: call void @bar(i8 %[[E]])
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call void @bar(i8 %f)
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ret void
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}
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; CHECK-LABEL: define i8 @unoptimizable2() {
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define i8 @unoptimizable2() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr
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call void @foo(i8* %ptr)
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%a = load i8, i8* %ptr
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call void @foo(i8* %ptr)
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%b = load i8, i8* %ptr, !invariant.group !0
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; CHECK: ret i8 %a
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @unoptimizable3() {
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define i8 @unoptimizable3() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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%ptr2 = call i8* @getPointer(i8* %ptr)
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%a = load i8, i8* %ptr2, !invariant.group !0
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; CHECK: ret i8 %a
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @optimizable4() {
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define i8 @optimizable4() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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%ptr2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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; CHECK-NOT: load
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%a = load i8, i8* %ptr2, !invariant.group !0
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; CHECK: ret i8 42
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @volatile1() {
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define i8 @volatile1() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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call void @foo(i8* %ptr)
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%a = load i8, i8* %ptr, !invariant.group !0
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%b = load volatile i8, i8* %ptr
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; CHECK: call void @bar(i8 %b)
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call void @bar(i8 %b)
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%c = load volatile i8, i8* %ptr, !invariant.group !0
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; FIXME: we could change %c to 42, preserving volatile load
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; CHECK: call void @bar(i8 %c)
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call void @bar(i8 %c)
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; CHECK: ret i8 42
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @volatile2() {
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define i8 @volatile2() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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call void @foo(i8* %ptr)
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%a = load i8, i8* %ptr, !invariant.group !0
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%b = load volatile i8, i8* %ptr
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; CHECK: call void @bar(i8 %b)
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call void @bar(i8 %b)
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%c = load volatile i8, i8* %ptr, !invariant.group !0
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; FIXME: we could change %c to 42, preserving volatile load
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; CHECK: call void @bar(i8 %c)
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call void @bar(i8 %c)
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; CHECK: ret i8 42
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ret i8 %a
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}
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; CHECK-LABEL: define i8 @fun() {
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define i8 @fun() {
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entry:
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%ptr = alloca i8
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store i8 42, i8* %ptr, !invariant.group !0
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call void @foo(i8* %ptr)
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%a = load i8, i8* %ptr, !invariant.group !0 ; Can assume that value under %ptr didn't change
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; CHECK: call void @bar(i8 42)
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call void @bar(i8 %a)
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%newPtr = call i8* @getPointer(i8* %ptr)
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%c = load i8, i8* %newPtr, !invariant.group !0 ; Can't assume anything, because we only have information about %ptr
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; CHECK: call void @bar(i8 %c)
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call void @bar(i8 %c)
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%unknownValue = load i8, i8* @unknownPtr
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; FIXME: Can assume that %unknownValue == 42
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; CHECK: store i8 %unknownValue, i8* %ptr, !invariant.group !0
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store i8 %unknownValue, i8* %ptr, !invariant.group !0
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%newPtr2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %ptr)
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; CHECK-NOT: load
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%d = load i8, i8* %newPtr2, !invariant.group !0
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; CHECK: ret i8 %unknownValue
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ret i8 %d
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}
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; This test checks if invariant.group understands gep with zeros
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; CHECK-LABEL: define void @testGEP0() {
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define void @testGEP0() {
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%a = alloca %struct.A, align 8
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%1 = bitcast %struct.A* %a to i8*
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%2 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @_ZTV1A, i64 0, i64 2) to i32 (...)**), i32 (...)*** %2, align 8, !invariant.group !0
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; CHECK: call void @_ZN1A3fooEv(%struct.A* nonnull dereferenceable(8) %a)
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call void @_ZN1A3fooEv(%struct.A* nonnull dereferenceable(8) %a) ; This call may change vptr
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%3 = load i8, i8* @unknownPtr, align 4
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%4 = icmp eq i8 %3, 0
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br i1 %4, label %_Z1gR1A.exit, label %5
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; This should be devirtualized by invariant.group
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%6 = bitcast %struct.A* %a to void (%struct.A*)***
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%7 = load void (%struct.A*)**, void (%struct.A*)*** %6, align 8, !invariant.group !0
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%8 = load void (%struct.A*)*, void (%struct.A*)** %7, align 8
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; CHECK: call void @_ZN1A3fooEv(%struct.A* nonnull %a)
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call void %8(%struct.A* nonnull %a)
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br label %_Z1gR1A.exit
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_Z1gR1A.exit: ; preds = %0, %5
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ret void
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}
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; Check if no optimizations are performed with global pointers.
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; FIXME: we could do the optimizations if we would check if dependency comes
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; from the same function.
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; CHECK-LABEL: define void @testGlobal() {
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define void @testGlobal() {
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; CHECK: %a = load i8, i8* @unknownPtr, !invariant.group !0
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%a = load i8, i8* @unknownPtr, !invariant.group !0
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call void @foo2(i8* @unknownPtr, i8 %a)
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; CHECK: %1 = load i8, i8* @unknownPtr, !invariant.group !0
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%1 = load i8, i8* @unknownPtr, !invariant.group !0
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call void @bar(i8 %1)
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%b0 = bitcast i8* @unknownPtr to i1*
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call void @fooBit(i1* %b0, i1 1)
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; Adding regex because of canonicalization of bitcasts
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; CHECK: %2 = load i1, i1* {{.*}}, !invariant.group !0
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%2 = load i1, i1* %b0, !invariant.group !0
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call void @fooBit(i1* %b0, i1 %2)
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; CHECK: %3 = load i1, i1* {{.*}}, !invariant.group !0
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%3 = load i1, i1* %b0, !invariant.group !0
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call void @fooBit(i1* %b0, i1 %3)
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ret void
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}
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; And in the case it is not global
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; CHECK-LABEL: define void @testNotGlobal() {
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define void @testNotGlobal() {
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%a = alloca i8
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call void @foo(i8* %a)
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; CHECK: %b = load i8, i8* %a, !invariant.group !0
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%b = load i8, i8* %a, !invariant.group !0
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call void @foo2(i8* %a, i8 %b)
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%1 = load i8, i8* %a, !invariant.group !0
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; CHECK: call void @bar(i8 %b)
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call void @bar(i8 %1)
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%b0 = bitcast i8* %a to i1*
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call void @fooBit(i1* %b0, i1 1)
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; CHECK: %1 = trunc i8 %b to i1
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%2 = load i1, i1* %b0, !invariant.group !0
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; CHECK-NEXT: call void @fooBit(i1* %b0, i1 %1)
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call void @fooBit(i1* %b0, i1 %2)
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%3 = load i1, i1* %b0, !invariant.group !0
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; CHECK-NEXT: call void @fooBit(i1* %b0, i1 %1)
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call void @fooBit(i1* %b0, i1 %3)
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ret void
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}
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; CHECK-LABEL: define void @handling_loops()
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define void @handling_loops() {
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%a = alloca %struct.A, align 8
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%1 = bitcast %struct.A* %a to i8*
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%2 = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 0
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store i32 (...)** bitcast (i8** getelementptr inbounds ([3 x i8*], [3 x i8*]* @_ZTV1A, i64 0, i64 2) to i32 (...)**), i32 (...)*** %2, align 8, !invariant.group !0
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%3 = load i8, i8* @unknownPtr, align 4
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%4 = icmp sgt i8 %3, 0
|
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br i1 %4, label %.lr.ph.i, label %_Z2g2R1A.exit
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|
|
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.lr.ph.i: ; preds = %0
|
|
%5 = bitcast %struct.A* %a to void (%struct.A*)***
|
|
%6 = load i8, i8* @unknownPtr, align 4
|
|
%7 = icmp sgt i8 %6, 1
|
|
br i1 %7, label %._crit_edge.preheader, label %_Z2g2R1A.exit
|
|
|
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._crit_edge.preheader: ; preds = %.lr.ph.i
|
|
br label %._crit_edge
|
|
|
|
._crit_edge: ; preds = %._crit_edge.preheader, %._crit_edge
|
|
%8 = phi i8 [ %10, %._crit_edge ], [ 1, %._crit_edge.preheader ]
|
|
%.pre = load void (%struct.A*)**, void (%struct.A*)*** %5, align 8, !invariant.group !0
|
|
%9 = load void (%struct.A*)*, void (%struct.A*)** %.pre, align 8
|
|
; CHECK: call void @_ZN1A3fooEv(%struct.A* nonnull %a)
|
|
call void %9(%struct.A* nonnull %a) #3
|
|
; CHECK-NOT: call void %
|
|
%10 = add nuw nsw i8 %8, 1
|
|
%11 = load i8, i8* @unknownPtr, align 4
|
|
%12 = icmp slt i8 %10, %11
|
|
br i1 %12, label %._crit_edge, label %_Z2g2R1A.exit.loopexit
|
|
|
|
_Z2g2R1A.exit.loopexit: ; preds = %._crit_edge
|
|
br label %_Z2g2R1A.exit
|
|
|
|
_Z2g2R1A.exit: ; preds = %_Z2g2R1A.exit.loopexit, %.lr.ph.i, %0
|
|
ret void
|
|
}
|
|
|
|
|
|
declare void @foo(i8*)
|
|
declare void @foo2(i8*, i8)
|
|
declare void @bar(i8)
|
|
declare i8* @getPointer(i8*)
|
|
declare void @_ZN1A3fooEv(%struct.A*)
|
|
declare void @_ZN1AC1Ev(%struct.A*)
|
|
declare void @fooBit(i1*, i1)
|
|
|
|
declare i8* @llvm.launder.invariant.group.p0i8(i8*)
|
|
declare i8* @llvm.strip.invariant.group.p0i8(i8*)
|
|
|
|
|
|
declare void @llvm.assume(i1 %cmp.vtables)
|
|
|
|
|
|
!0 = !{} |