| // Copyright 2016 The Fuchsia Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style license that can be | |
| // found in the LICENSE file. | |
| #include "textflag.h" | |
| // func FFS(x uint64) (n uint) | |
| TEXT ·FFS(SB), NOSPLIT, $0 | |
| MOVD x+0(FP), R0 | |
| RBIT R0, R0 | |
| CLZ R0, R0 | |
| MOVD R0, n+8(FP) | |
| RET | |
| // func CLZ(x uint64) (n uint) | |
| TEXT ·CLZ(SB), NOSPLIT, $0 | |
| MOVD x+0(FP), R0 | |
| CLZ R0, R0 | |
| MOVD R0, n+8(FP) | |
| RET |