338 lines
10 KiB
LLVM
338 lines
10 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.invariant.group.barrier(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 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 !2
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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 !2
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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 !2
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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 !2
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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 !2
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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 !2
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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 !2
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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 !1
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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 !1
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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 !1
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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 ![[OneMD:[0-9]]]
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%e = load i8, i8* %ptr, !invariant.group !1
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; CHECK-NOT: load
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%f = load i8, i8* %ptr, !invariant.group !1
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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 @unoptimizable4() {
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define i8 @unoptimizable4() {
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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.invariant.group.barrier(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 @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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call void @foo(i8* %ptr)
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%b = load i8, i8* %ptr, !invariant.group !1 ; Can't assume anything, because group changed
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; CHECK: call void @bar(i8 %b)
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call void @bar(i8 %b)
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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.invariant.group.barrier(i8* %ptr)
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%d = load i8, i8* %newPtr2, !invariant.group !0 ; Can't step through invariant.group.barrier to get value of %ptr
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; CHECK: ret i8 %d
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ret i8 %d
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}
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declare void @foo(i8*)
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declare void @bar(i8)
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declare i8* @getPointer(i8*)
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declare void @_ZN1A3fooEv(%struct.A*)
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declare void @_ZN1AC1Ev(%struct.A*)
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declare i8* @llvm.invariant.group.barrier(i8*)
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; Function Attrs: nounwind
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declare void @llvm.assume(i1 %cmp.vtables) #0
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attributes #0 = { nounwind }
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; CHECK: ![[OneMD]] = !{!"other ptr"}
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!0 = !{!"magic ptr"}
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!1 = !{!"other ptr"}
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!2 = !{!"vtable_of_a"}
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