| // Copyright 2015 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. |
| |
| package runtime |
| |
| import ( |
| "internal/cpu" |
| "unsafe" |
| ) |
| |
| // Offsets into internal/cpu records for use in assembly. |
| const ( |
| offsetX86HasAVX2 = unsafe.Offsetof(cpu.X86.HasAVX2) |
| ) |
| |
| var useAVXmemmove bool |
| |
| func init() { |
| // Let's remove stepping and reserved fields |
| processor := processorVersionInfo & 0x0FFF3FF0 |
| |
| isIntelBridgeFamily := isIntel && |
| processor == 0x206A0 || |
| processor == 0x206D0 || |
| processor == 0x306A0 || |
| processor == 0x306E0 |
| |
| useAVXmemmove = cpu.X86.HasAVX && !isIntelBridgeFamily |
| } |
