| // Copyright 2016 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. |
| |
| #include "textflag.h" |
| |
| // func featureCheck() bool |
| TEXT ·featureCheck(SB),NOSPLIT,$16-1 |
| LA tmp-16(SP), R1 |
| XOR R0, R0 // query function code is 0 |
| WORD $0xB93E0006 // KIMD (R6 is ignored) |
| MOVBZ tmp-16(SP), R4 // get the first byte |
| AND $0x20, R4 // bit 2 (big endian) for SHA256 |
| CMPBEQ R4, $0, nosha256 |
| MOVB $1, ret+0(FP) |
| RET |
| nosha256: |
| MOVB $0, ret+0(FP) |
| RET |
| |
| // func block(dig *digest, p []byte) |
| TEXT ·block(SB),NOSPLIT,$0-32 |
| MOVBZ ·useAsm(SB), R4 |
| LMG dig+0(FP), R1, R3 // R2 = &p[0], R3 = len(p) |
| CMPBNE R4, $1, generic |
| MOVBZ $2, R0 // SHA256 function code |
| loop: |
| WORD $0xB93E0002 // KIMD R2 |
| BVS loop // continue if interrupted |
| done: |
| XOR R0, R0 // restore R0 |
| RET |
| generic: |
| BR ·blockGeneric(SB) |
