diff options
Diffstat (limited to 'vendor/github.com/golang/snappy/decode_arm64.s')
| -rw-r--r-- | vendor/github.com/golang/snappy/decode_arm64.s | 45 |
1 files changed, 18 insertions, 27 deletions
diff --git a/vendor/github.com/golang/snappy/decode_arm64.s b/vendor/github.com/golang/snappy/decode_arm64.s index bfafa0ccfc..7a3ead17ea 100644 --- a/vendor/github.com/golang/snappy/decode_arm64.s +++ b/vendor/github.com/golang/snappy/decode_arm64.s @@ -70,7 +70,7 @@ loop: // x := uint32(src[s] >> 2) // switch MOVW $60, R1 - ADD R4>>2, ZR, R4 + LSRW $2, R4, R4 CMPW R4, R1 BLS tagLit60Plus @@ -111,13 +111,12 @@ doLit: // is contiguous in memory and so it needs to leave enough source bytes to // read the next tag without refilling buffers, but Go's Decode assumes // contiguousness (the src argument is a []byte). - MOVD $16, R1 - CMP R1, R4 - BGT callMemmove - CMP R1, R2 - BLT callMemmove - CMP R1, R3 - BLT callMemmove + CMP $16, R4 + BGT callMemmove + CMP $16, R2 + BLT callMemmove + CMP $16, R3 + BLT callMemmove // !!! Implement the copy from src to dst as a 16-byte load and store. // (Decode's documentation says that dst and src must not overlap.) @@ -130,9 +129,8 @@ doLit: // Note that on arm64, it is legal and cheap to issue unaligned 8-byte or // 16-byte loads and stores. This technique probably wouldn't be as // effective on architectures that are fussier about alignment. - - VLD1 0(R6), [V0.B16] - VST1 [V0.B16], 0(R7) + LDP 0(R6), (R14, R15) + STP (R14, R15), 0(R7) // d += length // s += length @@ -210,8 +208,7 @@ tagLit61: B doLit tagLit62Plus: - MOVW $62, R1 - CMPW R1, R4 + CMPW $62, R4 BHI tagLit63 // case x == 62: @@ -273,10 +270,9 @@ tagCopy: // We have a copy tag. We assume that: // - R3 == src[s] & 0x03 // - R4 == src[s] - MOVD $2, R1 - CMP R1, R3 - BEQ tagCopy2 - BGT tagCopy4 + CMP $2, R3 + BEQ tagCopy2 + BGT tagCopy4 // case tagCopy1: // s += 2 @@ -346,13 +342,11 @@ doCopy: // } // copy 16 bytes // d += length - MOVD $16, R1 - MOVD $8, R0 - CMP R1, R4 + CMP $16, R4 BGT slowForwardCopy - CMP R0, R5 + CMP $8, R5 BLT slowForwardCopy - CMP R1, R14 + CMP $16, R14 BLT slowForwardCopy MOVD 0(R15), R2 MOVD R2, 0(R7) @@ -426,8 +420,7 @@ makeOffsetAtLeast8: // // The two previous lines together means that d-offset, and therefore // // R15, is unchanged. // } - MOVD $8, R1 - CMP R1, R5 + CMP $8, R5 BGE fixUpSlowForwardCopy MOVD (R15), R3 MOVD R3, (R7) @@ -477,9 +470,7 @@ verySlowForwardCopy: ADD $1, R15, R15 ADD $1, R7, R7 SUB $1, R4, R4 - MOVD $0, R1 - CMP R1, R4 - BNE verySlowForwardCopy + CBNZ R4, verySlowForwardCopy B loop // The code above handles copy tags. |