runtime: use internal/cpu in alginit

After CL 104636 the feature flags in internal/cpu are initialized before
alginit and can now be used for aeshash feature detection. Also remove
now unused runtime variables:
x86:
	support_ssse3
	support_sse42
	support_aes
arm64:
	support_aes

Change-Id: I2f64198d91750eaf3c6cf2aac6e9e17615811ec8
Reviewed-on: https://go-review.googlesource.com/106015
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/alg.go

@@ -5,6 +5,7 @@
 package runtime
 
 import (
+	"internal/cpu"
 	"runtime/internal/sys"
 	"unsafe"
 )
@@ -282,13 +283,13 @@ func alginit() {
 	// Install AES hash algorithms if the instructions needed are present.
 	if (GOARCH == "386" || GOARCH == "amd64") &&
 		GOOS != "nacl" &&
-		support_aes && // AESENC
-		support_ssse3 && // PSHUFB
-		support_sse41 { // PINSR{D,Q}
+		cpu.X86.HasAES && // AESENC
+		cpu.X86.HasSSSE3 && // PSHUFB
+		cpu.X86.HasSSE41 { // PINSR{D,Q}
 		initAlgAES()
 		return
 	}
-	if GOARCH == "arm64" && arm64_support_aes {
+	if GOARCH == "arm64" && cpu.ARM64.HasAES {
 		initAlgAES()
 		return
 	}

src/runtime/asm_386.s

@@ -167,21 +167,12 @@ notintel:
 	TESTL	$(1<<26), DX // SSE2
 	SETNE	runtime·support_sse2(SB)
 
-	TESTL	$(1<<9), DI // SSSE3
-	SETNE	runtime·support_ssse3(SB)
-
 	TESTL	$(1<<19), DI // SSE4.1
 	SETNE	runtime·support_sse41(SB)
 
-	TESTL	$(1<<20), DI // SSE4.2
-	SETNE	runtime·support_sse42(SB)
-
 	TESTL	$(1<<23), DI // POPCNT
 	SETNE	runtime·support_popcnt(SB)
 
-	TESTL	$(1<<25), DI // AES
-	SETNE	runtime·support_aes(SB)
-
 	TESTL	$(1<<27), DI // OSXSAVE
 	SETNE	runtime·support_osxsave(SB)
 

src/runtime/asm_amd64.s

@@ -130,21 +130,12 @@ notintel:
 	TESTL	$(1<<26), DX // SSE2
 	SETNE	runtime·support_sse2(SB)
 
-	TESTL	$(1<<9), CX // SSSE3
-	SETNE	runtime·support_ssse3(SB)
-
 	TESTL	$(1<<19), CX // SSE4.1
 	SETNE	runtime·support_sse41(SB)
 
-	TESTL	$(1<<20), CX // SSE4.2
-	SETNE	runtime·support_sse42(SB)
-
 	TESTL	$(1<<23), CX // POPCNT
 	SETNE	runtime·support_popcnt(SB)
 
-	TESTL	$(1<<25), CX // AES
-	SETNE	runtime·support_aes(SB)
-
 	TESTL	$(1<<27), CX // OSXSAVE
 	SETNE	runtime·support_osxsave(SB)
 

src/runtime/asm_amd64p32.s

@@ -50,21 +50,12 @@ notintel:
 	TESTL	$(1<<26), DX // SSE2
 	SETNE	runtime·support_sse2(SB)
 
-	TESTL	$(1<<9), CX // SSSE3
-	SETNE	runtime·support_ssse3(SB)
-
 	TESTL	$(1<<19), CX // SSE4.1
 	SETNE	runtime·support_sse41(SB)
 
-	TESTL	$(1<<20), CX // SSE4.2
-	SETNE	runtime·support_sse42(SB)
-
 	TESTL	$(1<<23), CX // POPCNT
 	SETNE	runtime·support_popcnt(SB)
 
-	TESTL	$(1<<25), CX // AES
-	SETNE	runtime·support_aes(SB)
-
 	TESTL	$(1<<27), CX // OSXSAVE
 	SETNE	runtime·support_osxsave(SB)
 

src/runtime/os_linux_arm64.go

@@ -29,7 +29,6 @@ func archauxv(tag, val uintptr) {
 		randomNumber = uint32(startupRandomData[4]) | uint32(startupRandomData[5])<<8 |
 			uint32(startupRandomData[6])<<16 | uint32(startupRandomData[7])<<24
 	case _AT_HWCAP:
-		arm64_support_aes = ((val>>3)&0x1 == 0x1)
 		cpu_hwcap = uint(val)
 	case _AT_HWCAP2:
 		cpu_hwcap2 = uint(val)

src/runtime/runtime2.go

@@ -771,7 +771,6 @@ var (
 	processorVersionInfo uint32
 	isIntel              bool
 	lfenceBeforeRdtsc    bool
-	support_aes          bool
 	support_avx          bool
 	support_avx2         bool
 	support_erms         bool
@@ -779,10 +778,6 @@ var (
 	support_popcnt       bool
 	support_sse2         bool
 	support_sse41        bool
-	support_sse42        bool
-	support_ssse3        bool
-
-	arm64_support_aes bool
 
 	goarm                uint8 // set by cmd/link on arm systems
 	framepointer_enabled bool  // set by cmd/link