| // Copyright 2026 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| //go:build gc |
| |
| #include "textflag.h" |
| |
| // Read the vector register length in bytes from the vlenb CSR. |
| // May only be called when the vector extension is present. |
| // func readVLENB() uint |
| TEXT ·readVLENB(SB), NOSPLIT|NOFRAME, $0-8 |
| // Go 1.25's assembler does not recognize VLENB, so use its raw CSRR encoding. |
| // Replace WORD with CSRR VLENB, X10 once go.mod requires Go 1.27. |
| WORD $0xc2202573 |
| MOV X10, ret+0(FP) |
| RET |
