fd739804e0
For a default visibility external linkage definition, dso_local is set for ELF
-fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar
to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences.
To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition,
which sets dso_local for default visibility external linkage definitions.
To make this flip smooth and enable future (dso_local as definition default),
this patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
61 lines
1.7 KiB
C++
61 lines
1.7 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 -fno-experimental-new-pass-manager -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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