142ea99832
This change depends on the corresponding LLVM change at: https://reviews.llvm.org/D22519 The llvm.invariant.start and llvm.invariant.end intrinsics currently support specifying invariant memory objects only in the default address space. With this LLVM change, these intrinsics are overloaded for any adddress space for memory objects and we can use these llvm invariant intrinsics in non-default address spaces. Example: llvm.invariant.start.p1i8(i64 4, i8 addrspace(1)* %ptr) This overloaded intrinsic is needed for representing final or invariant memory in managed languages. llvm-svn: 276448
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple i686-linux-gnu -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK-O0
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// RUN: %clang_cc1 -triple i686-linux-gnu -emit-llvm %s -O1 -o - | FileCheck %s
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// Check that we add an llvm.invariant.start.p0i8 to mark when a global becomes
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// read-only. If globalopt can fold the initializer, it will then mark the
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// variable as constant.
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// Do not produce markers at -O0.
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// CHECK-O0-NOT: llvm.invariant.start.p0i8
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struct A {
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A();
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int n;
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};
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// CHECK: @a = global {{.*}} zeroinitializer
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extern const A a = A();
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struct B {
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B();
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mutable int n;
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};
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// CHECK: @b = global {{.*}} zeroinitializer
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extern const B b = B();
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struct C {
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C();
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~C();
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int n;
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};
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// CHECK: @c = global {{.*}} zeroinitializer
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extern const C c = C();
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int f();
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// CHECK: @d = global i32 0
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extern const int d = f();
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void e() {
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static const A a = A();
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}
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// CHECK: call void @_ZN1AC1Ev({{.*}}* nonnull @a)
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// CHECK: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @a to i8*))
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// CHECK: call void @_ZN1BC1Ev({{.*}}* nonnull @b)
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// CHECK-NOT: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @b to i8*))
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// CHECK: call void @_ZN1CC1Ev({{.*}}* nonnull @c)
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// CHECK-NOT: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @c to i8*))
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// CHECK: call i32 @_Z1fv(
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// CHECK: store {{.*}}, i32* @d
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// CHECK: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* bitcast ({{.*}} @d to i8*))
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// CHECK-LABEL: define void @_Z1ev(
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// CHECK: call void @_ZN1AC1Ev(%struct.A* nonnull @_ZZ1evE1a)
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// CHECK: call {{.*}}@llvm.invariant.start.p0i8(i64 4, i8* {{.*}}bitcast ({{.*}} @_ZZ1evE1a to i8*))
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// CHECK-NOT: llvm.invariant.end
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