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Author SHA1 Message Date
Craig Topper 5edccc4581 [RISCV] Avoid using x0,x0 vsetvli for vmv.x.s and vfmv.f.s unless we know the sew/lmul ratio is constant. 
Since we're changing VTYPE, we may change VLMAX which could
invalidate the previous VL. If we can't tell if it is safe we
should use an AVL of 1 instead of keeping the old VL.

This is a quick fix. We may want to thread VL to the pseudo
instruction instead of making up a value. That will require ISD
opcode changes and changes to the C intrinsic interface.

This fixes the issue raised in D106286.

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D106403
 2021-07-23 09:12:05 -07:00
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
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
Jessica Clarke d63d662d3c [RISCV] Remove --riscv-no-aliases from RVV tests 
This serves no useful purpose other than to clutter things up. Diff
summary as the real diff is extremely unwieldy:

   24844 -; CHECK-NEXT:    jalr zero, 0(ra)
   24844 +; CHECK-NEXT:    ret
       8 -; CHECK-NEXT:    vl4re8.v v28, (a0)
       8 +; CHECK-NEXT:    vl4r.v v28, (a0)
      64 -; CHECK-NEXT:    vl8re8.v v24, (a0)
      64 +; CHECK-NEXT:    vl8r.v v24, (a0)
     392 -; RUN:   --riscv-no-aliases < %s | FileCheck %s
     392 +; RUN:   < %s | FileCheck %s
       1 -; RUN:   -verify-machineinstrs --riscv-no-aliases < %s \
       1 +; RUN:   -verify-machineinstrs < %s \

As discussed in D103004.
 2021-05-26 17:59:38 +01:00
Hsiangkai Wang a3c783dbf2 [RISCV] Spilling for RISC-V V extension. (2nd version) 
Differential Revision: https://reviews.llvm.org/D95148
 2021-02-17 14:05:19 +08:00