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| author | Ilya Tocar <ilya.tocar@intel.com> | 2018-06-13 14:20:19 -0500 |
|---|---|---|
| committer | Ilya Tocar <ilya.tocar@intel.com> | 2019-03-13 17:50:18 +0000 |
| commit | 3aa7bbdbcb432f78462fa816ba7c63cb7f3991fe (patch) | |
| tree | b3cfdf77c28e30f78c5bc977224a72e67fde2854 /src/runtime/alg.go | |
| parent | 82bd93991a84042f4d960f0338cbff4792867857 (diff) | |
| download | go-3aa7bbdbcb432f78462fa816ba7c63cb7f3991fe.tar.gz go-3aa7bbdbcb432f78462fa816ba7c63cb7f3991fe.zip | |
runtime: simplify readUnaligned
We already have a pure go code sequence that is compiled into single load.
Just use it everywhere, instead of pointer hackery.
Passes toolstash-check.
Change-Id: I0c42b5532fa9a5665da3385913609c6d42aaff27
Reviewed-on: https://go-review.googlesource.com/c/go/+/118568
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Diffstat (limited to 'src/runtime/alg.go')
| -rw-r--r-- | src/runtime/alg.go | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/runtime/alg.go b/src/runtime/alg.go index 1c6795a1fa..732d32bf41 100644 --- a/src/runtime/alg.go +++ b/src/runtime/alg.go @@ -316,3 +316,21 @@ func initAlgAES() { // Initialize with random data so hash collisions will be hard to engineer. getRandomData(aeskeysched[:]) } + +// Note: These routines perform the read with an native endianness. +func readUnaligned32(p unsafe.Pointer) uint32 { + q := (*[4]byte)(p) + if sys.BigEndian { + return uint32(q[3]) | uint32(q[2])<<8 | uint32(q[1])<<16 | uint32(q[0])<<24 + } + return uint32(q[0]) | uint32(q[1])<<8 | uint32(q[2])<<16 | uint32(q[3])<<24 +} + +func readUnaligned64(p unsafe.Pointer) uint64 { + q := (*[8]byte)(p) + if sys.BigEndian { + return uint64(q[7]) | uint64(q[6])<<8 | uint64(q[5])<<16 | uint64(q[4])<<24 | + uint64(q[3])<<32 | uint64(q[2])<<40 | uint64(q[1])<<48 | uint64(q[0])<<56 + } + return uint64(q[0]) | uint64(q[1])<<8 | uint64(q[2])<<16 | uint64(q[3])<<24 | uint64(q[4])<<32 | uint64(q[5])<<40 | uint64(q[6])<<48 | uint64(q[7])<<56 +} |