3 Commits

Author	SHA1	Message	Date
Jonas Paulsson	61f5ba5c32	[SystemZ] Implement the packed stack layout ... Any llvm function with the "packed-stack" attribute will be compiled to use the packed stack layout which reuses unused parts of the incoming register save area. This is needed for building the Linux kernel. Review: Ulrich Weigand https://reviews.llvm.org/D70821	2019-12-12 10:26:03 -08:00
Jonas Paulsson	a7d3f6933d	[SystemZ] Return the right offsets from getCalleeSavedSpillSlots(). ... // Due to the SystemZ ABI, the DWARF CFA (Canonical Frame Address) is not // equal to the incoming stack pointer, but to incoming stack pointer plus // 160. The getOffsetOfLocalArea() returned value is interpreted as "the // offset of the local area from the CFA". The immediate offsets into the Register save area returned by getCalleeSavedSpillSlots() should take this offset into account, which this patch makes sure of. Patch and review by Ulrich Weigand. https://reviews.llvm.org/D70427	2019-11-25 19:03:05 +01:00
Ulrich Weigand	8b19be46c7	[SystemZ] Add support for anyregcc calling convention ... This adds back-end support for the anyregcc calling convention for use with patchpoints. Since all registers are considered call-saved with anyregcc (except for 0 and 1 which may still be clobbered by PLT stubs and the like), this required adding support for saving and restoring vector registers in prologue/epilogue code for the first time. This is not used by any other calling convention. llvm-svn: 326612	2018-03-02 20:40:11 +00:00