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Implement new CPU detection using cpuid, cpuidex plan9 instructions from klauspost/cpuid project, remove C code
This commit is contained in:
Harshavardhana
@@ -1,59 +0,0 @@
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/*
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* Minimalist Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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static void cpuid(int cpuinfo[4] ,int infotype) {
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__asm__ __volatile__ (
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"cpuid":
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"=a" (cpuinfo[0]),
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"=b" (cpuinfo[1]),
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"=c" (cpuinfo[2]),
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"=d" (cpuinfo[3]) :
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"a" (infotype), "c" (0)
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);
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}
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/*
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SSE41 : return true
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no SSE41 : return false
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*/
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int has_sse41 (void) {
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int info[4];
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cpuid(info, 0x00000001);
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return ((info[2] & ((int)1 << 19)) != 0);
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}
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/*
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AVX : return true
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no AVX : return false
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*/
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int has_avx (void) {
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int info[4];
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cpuid(info, 0x00000001);
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return ((info[2] & ((int)1 << 28)) != 0);
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}
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/*
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AVX2 : return true
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no AVX2 : return false
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*/
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int has_avx2 (void) {
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int info[4];
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cpuid(info, 0x00000007);
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return ((info[1] & ((int)1 << 5)) != 0);
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}
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@@ -1,37 +0,0 @@
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/*
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* Minimalist Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cpu
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// int has_sse41 (void);
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// int has_avx (void);
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// int has_avx2 (void);
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import "C"
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// HasSSE41 - CPUID instruction verification wrapper for SSE41 extensions
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func HasSSE41() bool {
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return int(C.has_sse41()) == 1
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}
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// HasAVX - CPUID instruction verification wrapper for AVX extensions
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func HasAVX() bool {
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return int(C.has_avx()) == 1
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}
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// HasAVX2 - CPUID instruction verification wrapper for AVX2 extensions
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func HasAVX2() bool {
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return int(C.has_avx2()) == 1
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}
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@@ -1,76 +0,0 @@
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/*
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* Minimalist Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cpu_test
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import (
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"errors"
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"os/exec"
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"runtime"
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"strings"
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"testing"
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. "github.com/minio/check"
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"github.com/minio/minio/pkg/utils/cpu"
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)
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func Test(t *testing.T) { TestingT(t) }
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type MySuite struct{}
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var _ = Suite(&MySuite{})
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func hasCPUFeatureFromOS(feature string) (bool, error) {
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if runtime.GOOS == "linux" {
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command := exec.Command("/bin/cat", "/proc/cpuinfo")
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output, err := command.Output()
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if err != nil {
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return false, err
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}
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if strings.Contains(string(output), feature) {
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return true, nil
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}
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return false, nil
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}
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return false, errors.New("Not Implemented on this platform")
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}
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func (s *MySuite) TestHasSSE41(c *C) {
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if runtime.GOOS == "linux" {
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var flag = cpu.HasSSE41()
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osCheck, err := hasCPUFeatureFromOS("sse4_1")
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c.Assert(err, IsNil)
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c.Check(flag, Equals, osCheck)
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}
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}
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func (s *MySuite) TestHasAVX(c *C) {
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if runtime.GOOS == "linux" {
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var flag = cpu.HasAVX()
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osFlag, err := hasCPUFeatureFromOS("avx")
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c.Assert(err, IsNil)
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c.Check(osFlag, Equals, flag)
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}
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}
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func (s *MySuite) TestHasAVX2(c *C) {
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if runtime.GOOS == "linux" {
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var flag = cpu.HasAVX2()
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osFlag, err := hasCPUFeatureFromOS("avx2")
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c.Assert(err, IsNil)
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c.Check(osFlag, Equals, flag)
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}
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}
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@@ -1,11 +0,0 @@
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// Package cpu provides wrapper around assembly functions for checking processor
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// instruction capabilities for SSE4.1, AVX, AVX2 support
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//
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// Example
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//
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// ``cpu.HasSSE41()`` returns true for SSE4.1 instruction support, false otherwise
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//
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// ``cpu.HasAVX()`` returns true for AVX instruction support, false otherwise
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//
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// ``cpu.HasAVX2()`` returns true for AVX2 instruction support, false otherwise
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package cpu
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