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| 1 ============================== | 1 ============================== |
| 2 LLVM Language Reference Manual | 2 LLVM Language Reference Manual |
| 3 ============================== | 3 ============================== |
| 4 | 4 |
| 5 .. contents:: | 5 .. contents:: |
| 6 :local: | 6 :local: |
| 7 :depth: 3 | 7 :depth: 3 |
| 8 | 8 |
| 9 Abstract | 9 Abstract |
| 10 ======== | 10 ======== |
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| 2861 | 2861 |
| 2862 LLVM has a number of "magic" global variables that contain data that | 2862 LLVM has a number of "magic" global variables that contain data that |
| 2863 affect code generation or other IR semantics. These are documented here. | 2863 affect code generation or other IR semantics. These are documented here. |
| 2864 All globals of this sort should have a section specified as | 2864 All globals of this sort should have a section specified as |
| 2865 "``llvm.metadata``". This section and all globals that start with | 2865 "``llvm.metadata``". This section and all globals that start with |
| 2866 "``llvm.``" are reserved for use by LLVM. | 2866 "``llvm.``" are reserved for use by LLVM. |
| 2867 | 2867 |
| 2868 The '``llvm.used``' Global Variable | 2868 The '``llvm.used``' Global Variable |
| 2869 ----------------------------------- | 2869 ----------------------------------- |
| 2870 | 2870 |
| 2871 The ``@llvm.used`` global is an array which has :ref:`appending linkage | 2871 The ``@llvm.used`` global is an array which has |
| 2872 <linkage_appending>`. This array contains a list of pointers to global | 2872 :ref:`appending linkage <linkage_appending>`. This array contains a list of |
| 2873 variables, functions and aliases which may optionally have a pointer cast formed | 2873 pointers to global variables, functions and aliases which may optionally have a |
| 2874 of bitcast or getelementptr. For example, a legal use of it is: | 2874 pointer cast formed of bitcast or getelementptr. For example, a legal |
| 2875 use of it is: |
| 2875 | 2876 |
| 2876 .. code-block:: llvm | 2877 .. code-block:: llvm |
| 2877 | 2878 |
| 2878 @X = global i8 4 | 2879 @X = global i8 4 |
| 2879 @Y = global i32 123 | 2880 @Y = global i32 123 |
| 2880 | 2881 |
| 2881 @llvm.used = appending global [2 x i8*] [ | 2882 @llvm.used = appending global [2 x i8*] [ |
| 2882 i8* @X, | 2883 i8* @X, |
| 2883 i8* bitcast (i32* @Y to i8*) | 2884 i8* bitcast (i32* @Y to i8*) |
| 2884 ], section "llvm.metadata" | 2885 ], section "llvm.metadata" |
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| 8606 Arguments: | 8607 Arguments: |
| 8607 """""""""" | 8608 """""""""" |
| 8608 | 8609 |
| 8609 None. | 8610 None. |
| 8610 | 8611 |
| 8611 Semantics: | 8612 Semantics: |
| 8612 """""""""" | 8613 """""""""" |
| 8613 | 8614 |
| 8614 This intrinsic does nothing, and it's removed by optimizers and ignored | 8615 This intrinsic does nothing, and it's removed by optimizers and ignored |
| 8615 by codegen. | 8616 by codegen. |
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