| // 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 |