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This patch defines the default parameters and validation for the aarch64 stack clash probing interval and guard sizes. It cleans up the previous implementation and insures that at no point the invalidate arguments are present in the pipeline for AArch64. Currently they are only corrected once cc1 initalizes the back-end. The default for AArch64 is 64 KB for both of these and we only support 4 KB and 64 KB probes. We also enforce that any value you set here for the parameters must be in sync. If an invalid value is specified an error will be generated and compilation aborted. gcc/ * common/config/aarch64/aarch64-common.c (TARGET_OPTION_DEFAULT_PARAM, aarch64_option_default_param): New. (params.h): Include. (TARGET_OPTION_VALIDATE_PARAM, aarch64_option_validate_param): New. * config/aarch64/aarch64.c (aarch64_override_options_internal): Simplify stack-clash protection validation code. From-SVN: r264757
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