From 4649876956ab944d2a9ea8fc98c75dc8a9f5ef08 Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Sat, 25 Jun 2022 00:36:16 +0200
Subject: Update dependencies (#1851)

---
 .../klauspost/compress/internal/cpuinfo/cpuinfo.go | 34 ++++++++++++++++++++
 .../compress/internal/cpuinfo/cpuinfo_amd64.go     | 11 +++++++
 .../compress/internal/cpuinfo/cpuinfo_amd64.s      | 36 ++++++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo.go
 create mode 100644 vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.go
 create mode 100644 vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.s

(limited to 'vendor/github.com/klauspost/compress/internal/cpuinfo')

diff --git a/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo.go b/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo.go
new file mode 100644
index 00000000..3954c512
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo.go
@@ -0,0 +1,34 @@
+// Package cpuinfo gives runtime info about the current CPU.
+//
+// This is a very limited module meant for use internally
+// in this project. For more versatile solution check
+// https://github.com/klauspost/cpuid.
+package cpuinfo
+
+// HasBMI1 checks whether an x86 CPU supports the BMI1 extension.
+func HasBMI1() bool {
+	return hasBMI1
+}
+
+// HasBMI2 checks whether an x86 CPU supports the BMI2 extension.
+func HasBMI2() bool {
+	return hasBMI2
+}
+
+// DisableBMI2 will disable BMI2, for testing purposes.
+// Call returned function to restore previous state.
+func DisableBMI2() func() {
+	old := hasBMI2
+	hasBMI2 = false
+	return func() {
+		hasBMI2 = old
+	}
+}
+
+// HasBMI checks whether an x86 CPU supports both BMI1 and BMI2 extensions.
+func HasBMI() bool {
+	return HasBMI1() && HasBMI2()
+}
+
+var hasBMI1 bool
+var hasBMI2 bool
diff --git a/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.go b/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.go
new file mode 100644
index 00000000..e802579c
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.go
@@ -0,0 +1,11 @@
+//go:build amd64 && !appengine && !noasm && gc
+// +build amd64,!appengine,!noasm,gc
+
+package cpuinfo
+
+// go:noescape
+func x86extensions() (bmi1, bmi2 bool)
+
+func init() {
+	hasBMI1, hasBMI2 = x86extensions()
+}
diff --git a/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.s b/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.s
new file mode 100644
index 00000000..4465fbe9
--- /dev/null
+++ b/vendor/github.com/klauspost/compress/internal/cpuinfo/cpuinfo_amd64.s
@@ -0,0 +1,36 @@
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+#include "funcdata.h"
+#include "go_asm.h"
+
+TEXT ·x86extensions(SB), NOSPLIT, $0
+	// 1. determine max EAX value
+	XORQ AX, AX
+	CPUID
+
+	CMPQ AX, $7
+	JB   unsupported
+
+	// 2. EAX = 7, ECX = 0 --- see Table 3-8 "Information Returned by CPUID Instruction"
+	MOVQ $7, AX
+	MOVQ $0, CX
+	CPUID
+
+	BTQ   $3, BX // bit 3 = BMI1
+	SETCS AL
+
+	BTQ   $8, BX // bit 8 = BMI2
+	SETCS AH
+
+	MOVB AL, bmi1+0(FP)
+	MOVB AH, bmi2+1(FP)
+	RET
+
+unsupported:
+	XORQ AX, AX
+	MOVB AL, bmi1+0(FP)
+	MOVB AL, bmi2+1(FP)
+	RET
-- 
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