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5 Commits

Author SHA1 Message Date
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
Craig Topper 527cd01314 [RISCV] Teach vsetvli insertion to use vsetvl x0, x0 form when we can tell that VLMAX and AVL haven't changed. 
This can help avoid needing a virtual register for the vsetvl output
when the AVL is X0. For other register AVLs it can shorter the live
range of the AVL register if it isn't needed later.

There's probably no advantage when AVL is a 5 bit immediate that
can use vsetivli. But do it anyway for consistency.

Reviewed By: rogfer01

Differential Revision: https://reviews.llvm.org/D103215
 2021-05-27 10:11:38 -07:00
Craig Topper fdf10e6197 [RISCV] Use X0 as destination of inserted vsetvli when possible. 
We aren't going to connect the result to anything so we might
as well avoid allocating a register.

Reviewed By: frasercrmck, HsiangKai

Differential Revision: https://reviews.llvm.org/D102031
 2021-05-26 13:08:51 -07:00
Hsiangkai Wang 6e360460f1 [RISCV] Use v8-v23 as argument registers to conform to the proposal. 
The maximum LMUL is 8. We need 16 vector registers for two LMUL-8
arguments. The modification follows the proposal of psABI in
https://github.com/riscv/riscv-elf-psabi-doc/pull/171

Differential Revision: https://reviews.llvm.org/D95134
 2021-01-22 07:55:24 +08:00
Hsiangkai Wang e5e329023b [RISCV] Implement vlsseg intrinsics. 
Define vlsseg intrinsics and pseudo instructions. Lower vlsseg intrinsics
to pseudo instructions in RISCVDAGToDAGISel.

Differential Revision: https://reviews.llvm.org/D94763
 2021-01-21 11:51:35 +08:00