mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
9032a3fc4f
Summary:
Memory Dependence Analysis was limited to return only local dependencies
for invariant.group handling. Now it returns NonLocal when it finds it
and then by asking getNonLocalPointerDependency we get found dep.
Thanks to this we are able to devirtualize loops!
void indirect(A &a, int n) {
for (int i = 0 ; i < n; i++)
a.foo();
}
void test(int n) {
A a;
indirect(a);
}
After inlining a.foo() will be changed to direct call, even if foo and A::A()
is external (but only if vtable definition is be available).
Reviewers: nlewycky, dberlin, chandlerc, rsmith
Subscribers: mehdi_amini, davide, llvm-commits
Differential Revision: https://reviews.llvm.org/D28137
llvm-svn: 291762
455 lines
14 KiB
LLVM
455 lines
14 KiB
LLVM
; XFAIL: *
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; RUN: opt < %s -newgvn -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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; 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: %trunc = 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 %trunc)
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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 %trunc)
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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
|
|
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
|
|
%3 = load i8, i8* @unknownPtr, align 4
|
|
%4 = icmp sgt i8 %3, 0
|
|
br i1 %4, label %.lr.ph.i, label %_Z2g2R1A.exit
|
|
|
|
.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
|
|
|
|
._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.invariant.group.barrier(i8*)
|
|
|
|
; Function Attrs: nounwind
|
|
declare void @llvm.assume(i1 %cmp.vtables) #0
|
|
|
|
|
|
attributes #0 = { nounwind }
|
|
; CHECK: ![[OneMD]] = !{!"other ptr"}
|
|
!0 = !{!"magic ptr"}
|
|
!1 = !{!"other ptr"}
|
|
!2 = !{!"vtable_of_a"}
|