00223827a9
Summary: * Don't bother using a thread wrapper when the variable is known to have constant initialization. * Emit the thread wrapper as discardable-if-unused in TUs that don't contain a definition of the thread_local variable. * Don't emit the thread wrapper at all if the thread_local variable is unused and discardable; it will be emitted by all TUs that need it. Reviewers: rjmccall, jdoerfert Subscribers: cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D67429 llvm-svn: 371767
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++2a %s -emit-llvm -o - | FileCheck %s
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// CHECK-DAG: @a = external thread_local global i32
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extern thread_local int a;
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// CHECK-DAG: @b = external thread_local global i32
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extern thread_local constinit int b;
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// CHECK-LABEL: define i32 @_Z1fv()
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// CHECK: call i32* @_ZTW1a()
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// CHECK: }
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int f() { return a; }
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// CHECK-LABEL: define linkonce_odr {{.*}} @_ZTW1a()
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// CHECK: br i1
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// CHECK: call void @_ZTH1a()
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// CHECK: }
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// CHECK-LABEL: define i32 @_Z1gv()
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// CHECK-NOT: call
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// CHECK: load i32, i32* @b
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// CHECK-NOT: call
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// CHECK: }
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int g() { return b; }
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// CHECK-NOT: define {{.*}} @_ZTW1b()
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extern thread_local int c;
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// CHECK-LABEL: define i32 @_Z1hv()
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// CHECK: call i32* @_ZTW1c()
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// CHECK: load i32, i32* %
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// CHECK: }
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int h() { return c; }
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thread_local int c = 0;
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int d_init();
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thread_local int d = d_init();
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// Note: use of 'c' does not trigger initialization of 'd', because 'c' has a
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// constant initializer.
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// CHECK-LABEL: define weak_odr {{.*}} @_ZTW1c()
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// CHECK-NOT: br i1
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// CHECK-NOT: call
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// CHECK: ret i32* @c
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// CHECK: }
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