3 Commits

Author	SHA1	Message	Date
Hsiangkai Wang	643b6407fa	[RISCV] Avoid scalar outgoing argumetns overwriting vector frame objects. ... When using FP to access stack objects, the scalable stack objects will be put at the lower end of the frame. It looks like ``` |-------------------| <-- FP | callee-saved regs | |-------------------| | scalar local vars | |-------------------| | RVV local vars | |-------------------| <-- SP ``` If there are scalar arguments that need to pass through memory and there are vector objects on the stack using FP to access. The outgoing scalar arguments will overwrite the vector objects. It looks like ``` |-------------------| <-- FP | callee-saved regs | |-------------------| | scalar local vars | |-------------------| |-------------------| | RVV local vars | | outgoing args | <- outgoing arguments |-------------------| <-- SP |-------------------| overwrite from here. ``` In this patch, we reserve the stack for the outgoing arguments before function calls if using FP to access and there are scalable vector frame objects. It looks like ``` |-------------------| <-- FP | callee-saved regs | |-------------------| | scalar local vars | |-------------------| | RVV local vars | |-------------------| | outgoing args | |-------------------| <-- SP ``` Differential Revision: https://reviews.llvm.org/D103622	2021-06-11 12:26:29 +08:00
Jim Lin	242ddd5089	[RISCV][NFC] Add a single space after comma for VType ... In most of cases, it has a single space after comma in assembly operands. Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D103790	2021-06-09 11:18:22 +08:00
Hsiangkai Wang	9d4922eab4	[RISCV] Precommit a test case to show overwriting vector frame objects.	2021-06-03 23:25:45 +08:00