Macros related to architecture settings
The following macros can be tested for target architecture settings. All of these macros are predefined to a value of 1 by a -mcpu compiler option setting, or any other compiler option that implies that setting. If the -mcpu suboption enabling the feature is not in effect, then the macro is undefined.
| Macro name | Description | Predefined by the following -mcpu suboptions |
|---|---|---|
| _ARCH_PPC | Indicates that the application is targeted to run on any Power® processor. | Defined for all -mcpu suboptions except auto. |
| _ARCH_PPC64 | Indicates that the application is targeted to run on Power processors with 64-bit support. | pwr8 |
| _ARCH_PPCGR | Indicates that the application is targeted to run on Power processors with graphics support. | pwr8 |
| _ARCH_PWR4 | Indicates that the application is targeted to run on POWER4 or higher processors. | pwr8 |
| _ARCH_PWR5 | Indicates that the application is targeted to run on POWER5 or higher processors. | pwr8 |
| _ARCH_PWR5X | Indicates that the application is targeted to run on POWER5+ or higher processors. | pwr8 |
| _ARCH_PWR6 | Indicates that the application is targeted to run on POWER6® or higher processors. | pwr8 |
| _ARCH_PWR7 | Indicates that the application is targeted to run on POWER7® , POWER7+™ or higher processors. | pwr8 |
| _ARCH_PWR8 | Indicates that the application is targeted to run on POWER8® processors. | pwr8 |
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