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Pick an alternate static chain regnum and document that the port needs to be configured to issue -ffixed-r18 by default. The current definition of TARGET_OS_USES_R18 is not honored by the common part of the back-end. 2020-11-04 Olivier Hainque <hainque@adacore.com> gcc/ * config/aarch64/aarch64-vxworks.h (TARGET_OS_USES_R18): Remove definition. (STATIC_CHAIN_REGNUM): Redefine to 9.
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