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runtime: copy memory hash code from Go 1.7

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Rewrite the AES hashing code from gc assembler to C code using
    intrinsics.  The resulting code generates the same hash code for the
    same input as the gc code--that doesn't matter as such, but testing it
    ensures that the C code does something useful.
    
    Also change mips64pe32le to mips64p32le in configure script--noticed
    during CL review.
    
    Reviewed-on: https://go-review.googlesource.com/34022

From-SVN: r243445
This commit is contained in:
Ian Lance Taylor 2016-12-08 16:37:54 +00:00
parent b2264b0964
commit 453060a906
22 changed files with 937 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
gcc/go/gofrontend/MERGE
View File

@ -1,4 +1,4 @@
2442fca7be8a4f51ddc91070fa69ef66e24593ac
78e3527fcaf4ffd33b22e39a56e5d076844302be
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

2
gcc/go/gofrontend/types.cc
View File

@ -1648,7 +1648,7 @@ Type::type_functions(Gogo* gogo, Named_type* name, Function_type* hash_fntype,
const char* equal_fnname;
if (this->compare_is_identity(gogo))
{
hash_fnname = "__go_type_hash_identity";
hash_fnname = "runtime.memhash";
equal_fnname = "__go_type_equal_identity";
}
else

1
libgo/Makefile.am
View File

@ -422,6 +422,7 @@ endif
endif
runtime_files = \
runtime/aeshash.c \
runtime/go-assert.c \
runtime/go-breakpoint.c \
runtime/go-caller.c \

11
libgo/Makefile.in
View File

@ -189,7 +189,7 @@ libgo_llgo_la_DEPENDENCIES = $(am__DEPENDENCIES_4)
@LIBGO_IS_DARWIN_TRUE@@LIBGO_IS_LINUX_FALSE@am__objects_4 = \
@LIBGO_IS_DARWIN_TRUE@@LIBGO_IS_LINUX_FALSE@ getncpu-bsd.lo
@LIBGO_IS_LINUX_TRUE@am__objects_4 = getncpu-linux.lo
am__objects_5 = go-assert.lo go-breakpoint.lo go-caller.lo \
am__objects_5 = aeshash.lo go-assert.lo go-breakpoint.lo go-caller.lo \
go-callers.lo go-cdiv.lo go-cgo.lo go-construct-map.lo \
go-ffi.lo go-fieldtrack.lo go-matherr.lo go-memclr.lo \
go-memcmp.lo go-memequal.lo go-memmove.lo go-nanotime.lo \
@ -767,6 +767,7 @@ toolexeclibgounicode_DATA = \
@LIBGO_IS_DARWIN_TRUE@@LIBGO_IS_LINUX_FALSE@runtime_getncpu_file = runtime/getncpu-bsd.c
@LIBGO_IS_LINUX_TRUE@runtime_getncpu_file = runtime/getncpu-linux.c
runtime_files = \
runtime/aeshash.c \
runtime/go-assert.c \
runtime/go-breakpoint.c \
runtime/go-caller.c \
@ -1446,6 +1447,7 @@ mostlyclean-compile:
distclean-compile:
-rm -f *.tab.c
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/aeshash.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/env_posix.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getncpu-bsd.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/getncpu-irix.Plo@am__quote@
@ -1573,6 +1575,13 @@ libgolibbegin_a-go-libmain.obj: runtime/go-libmain.c
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libgolibbegin_a_CFLAGS) $(CFLAGS) -c -o libgolibbegin_a-go-libmain.obj `if test -f 'runtime/go-libmain.c'; then $(CYGPATH_W) 'runtime/go-libmain.c'; else $(CYGPATH_W) '$(srcdir)/runtime/go-libmain.c'; fi`
aeshash.lo: runtime/aeshash.c
@am__fastdepCC_TRUE@ $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT aeshash.lo -MD -MP -MF $(DEPDIR)/aeshash.Tpo -c -o aeshash.lo `test -f 'runtime/aeshash.c' || echo '$(srcdir)/'`runtime/aeshash.c
@am__fastdepCC_TRUE@ $(am__mv) $(DEPDIR)/aeshash.Tpo $(DEPDIR)/aeshash.Plo
@AMDEP_TRUE@@am__fastdepCC_FALSE@ source='runtime/aeshash.c' object='aeshash.lo' libtool=yes @AMDEPBACKSLASH@
@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
@am__fastdepCC_FALSE@ $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o aeshash.lo `test -f 'runtime/aeshash.c' || echo '$(srcdir)/'`runtime/aeshash.c
go-assert.lo: runtime/go-assert.c
@am__fastdepCC_TRUE@ $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT go-assert.lo -MD -MP -MF $(DEPDIR)/go-assert.Tpo -c -o go-assert.lo `test -f 'runtime/go-assert.c' || echo '$(srcdir)/'`runtime/go-assert.c
@am__fastdepCC_TRUE@ $(am__mv) $(DEPDIR)/go-assert.Tpo $(DEPDIR)/go-assert.Plo

2
libgo/configure vendored
View File

@ -13624,7 +13624,7 @@ esac
# supported by the gofrontend and all architectures supported by the
# gc toolchain.
# N.B. Keep in sync with gcc/testsuite/go.test/go-test.exp (go-set-goarch).
ALLGOARCH="386 alpha amd64 amd64p32 arm armbe arm64 arm64be ia64 m68k mipso32 mipsn32 mipso64 mipsn64 mips mipsle mips64 mips64le mips64p32 mips64pe32le ppc ppc64 ppc64le s390 s390x sparc sparc64"
ALLGOARCH="386 alpha amd64 amd64p32 arm armbe arm64 arm64be ia64 m68k mipso32 mipsn32 mipso64 mipsn64 mips mipsle mips64 mips64le mips64p32 mips64p32le ppc ppc64 ppc64le s390 s390x sparc sparc64"
# All known GOARCH_FAMILY values.
ALLGOARCHFAMILY="I386 ALPHA AMD64 ARM ARM64 IA64 M68K MIPS MIPS64 PPC PPC64 S390 S390X SPARC SPARC64"

2
libgo/configure.ac
View File

@ -197,7 +197,7 @@ AC_SUBST(USE_DEJAGNU)
# supported by the gofrontend and all architectures supported by the
# gc toolchain.
# N.B. Keep in sync with gcc/testsuite/go.test/go-test.exp (go-set-goarch).
ALLGOARCH="386 alpha amd64 amd64p32 arm armbe arm64 arm64be ia64 m68k mipso32 mipsn32 mipso64 mipsn64 mips mipsle mips64 mips64le mips64p32 mips64pe32le ppc ppc64 ppc64le s390 s390x sparc sparc64"
ALLGOARCH="386 alpha amd64 amd64p32 arm armbe arm64 arm64be ia64 m68k mipso32 mipsn32 mipso64 mipsn64 mips mipsle mips64 mips64le mips64p32 mips64p32le ppc ppc64 ppc64le s390 s390x sparc sparc64"
# All known GOARCH_FAMILY values.
ALLGOARCHFAMILY="I386 ALPHA AMD64 ARM ARM64 IA64 M68K MIPS MIPS64 PPC PPC64 S390 S390X SPARC SPARC64"

45
libgo/go/runtime/alg.go
View File

@ -23,12 +23,29 @@ import (
//go:linkname efacevaleq runtime.efacevaleq
//go:linkname eqstring runtime.eqstring
//go:linkname cmpstring runtime.cmpstring
//
// Temporary to be called from C code.
//go:linkname alginit runtime.alginit
const (
c0 = uintptr((8-sys.PtrSize)/4*2860486313 + (sys.PtrSize-4)/4*33054211828000289)
c1 = uintptr((8-sys.PtrSize)/4*3267000013 + (sys.PtrSize-4)/4*23344194077549503)
)
var useAeshash bool
// in C code
func aeshashbody(p unsafe.Pointer, h, s uintptr, sched []byte) uintptr
func aeshash(p unsafe.Pointer, h, s uintptr) uintptr {
return aeshashbody(p, h, s, aeskeysched[:])
}
func aeshashstr(p unsafe.Pointer, h uintptr) uintptr {
ps := (*stringStruct)(p)
return aeshashbody(unsafe.Pointer(ps.str), h, uintptr(ps.len), aeskeysched[:])
}
func interhash(p unsafe.Pointer, h uintptr, size uintptr) uintptr {
a := (*iface)(p)
tab := a.tab
@ -198,7 +215,35 @@ func cmpstring(x, y string) int {
// Force the creation of function descriptors for equality and hash
// functions. These will be referenced directly by the compiler.
var _ = memhash
var _ = interhash
var _ = interequal
var _ = nilinterhash
var _ = nilinterequal
const hashRandomBytes = sys.PtrSize / 4 * 64
// used in asm_{386,amd64}.s to seed the hash function
var aeskeysched [hashRandomBytes]byte
// used in hash{32,64}.go to seed the hash function
var hashkey [4]uintptr
func alginit() {
// Install aes hash algorithm if we have the instructions we need
if (GOARCH == "386" || GOARCH == "amd64") &&
GOOS != "nacl" &&
cpuid_ecx&(1<<25) != 0 && // aes (aesenc)
cpuid_ecx&(1<<9) != 0 && // sse3 (pshufb)
cpuid_ecx&(1<<19) != 0 { // sse4.1 (pinsr{d,q})
useAeshash = true
// Initialize with random data so hash collisions will be hard to engineer.
getRandomData(aeskeysched[:])
return
}
getRandomData((*[len(hashkey) * sys.PtrSize]byte)(unsafe.Pointer(&hashkey))[:])
hashkey[0] |= 1 // make sure these numbers are odd
hashkey[1] |= 1
hashkey[2] |= 1
hashkey[3] |= 1
}

94
libgo/go/runtime/hash32.go Normal file
View File

@ -0,0 +1,94 @@
// Copyright 2014 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.
// Hashing algorithm inspired by
// xxhash: https://code.google.com/p/xxhash/
// cityhash: https://code.google.com/p/cityhash/
// +build 386 arm armbe m68k mipso32 mipsn32 mips mipsle ppc s390 sparc
package runtime
import "unsafe"
// For gccgo, use go:linkname to rename compiler-called functions to
// themselves, so that the compiler will export them.
//
//go:linkname memhash runtime.memhash
const (
// Constants for multiplication: four random odd 32-bit numbers.
m1 = 3168982561
m2 = 3339683297
m3 = 832293441
m4 = 2336365089
)
func memhash(p unsafe.Pointer, seed, s uintptr) uintptr {
if GOARCH == "386" && GOOS != "nacl" && useAeshash {
return aeshash(p, seed, s)
}
h := uint32(seed + s*hashkey[0])
tail:
switch {
case s == 0:
case s < 4:
h ^= uint32(*(*byte)(p))
h ^= uint32(*(*byte)(add(p, s>>1))) << 8
h ^= uint32(*(*byte)(add(p, s-1))) << 16
h = rotl_15(h*m1) * m2
case s == 4:
h ^= readUnaligned32(p)
h = rotl_15(h*m1) * m2
case s <= 8:
h ^= readUnaligned32(p)
h = rotl_15(h*m1) * m2
h ^= readUnaligned32(add(p, s-4))
h = rotl_15(h*m1) * m2
case s <= 16:
h ^= readUnaligned32(p)
h = rotl_15(h*m1) * m2
h ^= readUnaligned32(add(p, 4))
h = rotl_15(h*m1) * m2
h ^= readUnaligned32(add(p, s-8))
h = rotl_15(h*m1) * m2
h ^= readUnaligned32(add(p, s-4))
h = rotl_15(h*m1) * m2
default:
v1 := h
v2 := uint32(seed * hashkey[1])
v3 := uint32(seed * hashkey[2])
v4 := uint32(seed * hashkey[3])
for s >= 16 {
v1 ^= readUnaligned32(p)
v1 = rotl_15(v1*m1) * m2
p = add(p, 4)
v2 ^= readUnaligned32(p)
v2 = rotl_15(v2*m2) * m3
p = add(p, 4)
v3 ^= readUnaligned32(p)
v3 = rotl_15(v3*m3) * m4
p = add(p, 4)
v4 ^= readUnaligned32(p)
v4 = rotl_15(v4*m4) * m1
p = add(p, 4)
s -= 16
}
h = v1 ^ v2 ^ v3 ^ v4
goto tail
}
h ^= h >> 17
h *= m3
h ^= h >> 13
h *= m4
h ^= h >> 16
return uintptr(h)
}
// Note: in order to get the compiler to issue rotl instructions, we
// need to constant fold the shift amount by hand.
// TODO: convince the compiler to issue rotl instructions after inlining.
func rotl_15(x uint32) uint32 {
return (x << 15) | (x >> (32 - 15))
}

94
libgo/go/runtime/hash64.go Normal file
View File

@ -0,0 +1,94 @@
// Copyright 2014 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.
// Hashing algorithm inspired by
// xxhash: https://code.google.com/p/xxhash/
// cityhash: https://code.google.com/p/cityhash/
// +build amd64 amd64p32 arm64 mips64 mips64le ppc64 ppc64le s390x alpha arm64be ia64 mipso64 mipsn64 mips64p32 mips64p32le sparc64
package runtime
import "unsafe"
// For gccgo, use go:linkname to rename compiler-called functions to
// themselves, so that the compiler will export them.
//
//go:linkname memhash runtime.memhash
const (
// Constants for multiplication: four random odd 64-bit numbers.
m1 = 16877499708836156737
m2 = 2820277070424839065
m3 = 9497967016996688599
m4 = 15839092249703872147
)
func memhash(p unsafe.Pointer, seed, s uintptr) uintptr {
if GOARCH == "amd64" && GOOS != "nacl" && useAeshash {
return aeshash(p, seed, s)
}
h := uint64(seed + s*hashkey[0])
tail:
switch {
case s == 0:
case s < 4:
h ^= uint64(*(*byte)(p))
h ^= uint64(*(*byte)(add(p, s>>1))) << 8
h ^= uint64(*(*byte)(add(p, s-1))) << 16
h = rotl_31(h*m1) * m2
case s <= 8:
h ^= uint64(readUnaligned32(p))
h ^= uint64(readUnaligned32(add(p, s-4))) << 32
h = rotl_31(h*m1) * m2
case s <= 16:
h ^= readUnaligned64(p)
h = rotl_31(h*m1) * m2
h ^= readUnaligned64(add(p, s-8))
h = rotl_31(h*m1) * m2
case s <= 32:
h ^= readUnaligned64(p)
h = rotl_31(h*m1) * m2
h ^= readUnaligned64(add(p, 8))
h = rotl_31(h*m1) * m2
h ^= readUnaligned64(add(p, s-16))
h = rotl_31(h*m1) * m2
h ^= readUnaligned64(add(p, s-8))
h = rotl_31(h*m1) * m2
default:
v1 := h
v2 := uint64(seed * hashkey[1])
v3 := uint64(seed * hashkey[2])
v4 := uint64(seed * hashkey[3])
for s >= 32 {
v1 ^= readUnaligned64(p)
v1 = rotl_31(v1*m1) * m2
p = add(p, 8)
v2 ^= readUnaligned64(p)
v2 = rotl_31(v2*m2) * m3
p = add(p, 8)
v3 ^= readUnaligned64(p)
v3 = rotl_31(v3*m3) * m4
p = add(p, 8)
v4 ^= readUnaligned64(p)
v4 = rotl_31(v4*m4) * m1
p = add(p, 8)
s -= 32
}
h = v1 ^ v2 ^ v3 ^ v4
goto tail
}
h ^= h >> 29
h *= m3
h ^= h >> 32
return uintptr(h)
}
// Note: in order to get the compiler to issue rotl instructions, we
// need to constant fold the shift amount by hand.
// TODO: convince the compiler to issue rotl instructions after inlining.
func rotl_31(x uint64) uint64 {
return (x << 31) | (x >> (64 - 31))
}

23
libgo/go/runtime/os_gccgo.go Normal file
View File

@ -0,0 +1,23 @@
// Copyright 2009 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 (
"unsafe"
)
var urandom_dev = []byte("/dev/urandom\x00")
func getRandomData(r []byte) {
if startupRandomData != nil {
n := copy(r, startupRandomData)
extendRandom(r, n)
return
}
fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
closefd(fd)
extendRandom(r, int(n))
}

12
libgo/go/runtime/runtime2.go
View File

@ -5,6 +5,7 @@
package runtime
import (
"runtime/internal/sys"
"unsafe"
)
@ -668,7 +669,6 @@ type forcegcstate struct {
// the ELF AT_RANDOM auxiliary vector (vdso_linux_amd64.go or os_linux_386.go).
var startupRandomData []byte
/*
// extendRandom extends the random numbers in r[:n] to the whole slice r.
// Treats n<0 as n==0.
func extendRandom(r []byte, n int) {
@ -689,7 +689,6 @@ func extendRandom(r []byte, n int) {
}
}
}
*/
// deferred subroutine calls
// This is the gccgo version.
@ -770,11 +769,12 @@ var (
sched schedt
// newprocs int32
// newprocs int32
// Information about what cpu features are available.
// Set on startup.
cpuid_ecx uint32
// Information about what cpu features are available.
// Set on startup in asm_{x86,amd64}.s.
// cpuid_ecx uint32
// cpuid_edx uint32
// cpuid_ebx7 uint32
// lfenceBeforeRdtsc bool

6
libgo/go/runtime/stubs.go
View File

@ -248,6 +248,12 @@ func funcPC(f interface{}) uintptr {
return **(**uintptr)(i.data)
}
// For gccgo, to communicate from the C code to the Go code.
//go:linkname setCpuidECX runtime.setCpuidECX
func setCpuidECX(v uint32) {
cpuid_ecx = v
}
// typedmemmove copies a typed value.
// For gccgo for now.
//go:nosplit

17
libgo/go/runtime/unaligned1.go Normal file
View File

@ -0,0 +1,17 @@
// Copyright 2014 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.
// +build 386 amd64 amd64p32 arm64 ppc64 ppc64le s390x ppc s390 arm64be
package runtime
import "unsafe"
func readUnaligned32(p unsafe.Pointer) uint32 {
return *(*uint32)(p)
}
func readUnaligned64(p unsafe.Pointer) uint64 {
return *(*uint64)(p)
}

20
libgo/go/runtime/unaligned2.go Normal file
View File

@ -0,0 +1,20 @@
// Copyright 2014 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.
// +build arm mips64 mips64le armbe m68k mipso32 mipsn32 mips mipsle sparc alpha ia64 mipso64 mipsn64 mips64p32 mips64p32le sparc64
package runtime
import "unsafe"
// Note: These routines perform the read with an unspecified endianness.
func readUnaligned32(p unsafe.Pointer) uint32 {
q := (*[4]byte)(p)
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)
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
}

583
libgo/runtime/aeshash.c Normal file
View File

@ -0,0 +1,583 @@
// Copyright 2016 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.
// Hash code using AES intrinsics.
#include "runtime.h"
uintptr aeshashbody(void*, uintptr, uintptr, Slice)
__asm__(GOSYM_PREFIX "runtime.aeshashbody");
uintptr aeshashbody(void*, uintptr, uintptr, Slice)
__attribute__((no_split_stack));
#if defined(__i386__) || defined(__x86_64__)
#include <emmintrin.h>
#include <tmmintrin.h>
#include <wmmintrin.h>
// Force appropriate CPU level. We won't call here unless the CPU
// supports it.
#pragma GCC target("ssse3", "aes")
#ifdef __x86_64__
// aeshashbody implements a hash function using AES instructions
// available in recent x86 processors. Note this is not encryption,
// just hashing.
//
// This is written to produce exactly the same results as the gc
// implementation, not because that matters, but just to ensure that
// this does something reasonable.
uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
__m128i mseed, mseed2, mseed3, mseed4, mseed5, mseed6, mseed7, mseed8;
__m128i mval, mval2, mval3, mval4, mval5, mval6, mval7, mval8;
// Start with hash seed.
mseed = _mm_cvtsi64_si128(seed);
// Get 16 bits of length.
mseed = _mm_insert_epi16(mseed, size, 4);
// Repeat length 4 times total.
mseed = _mm_shufflehi_epi16(mseed, 0);
// Save unscrambled seed.
mseed2 = mseed;
// XOR in per-process seed.
mseed ^= _mm_loadu_si128(aeskeysched.__values);
// Scramble seed.
mseed = _mm_aesenc_si128(mseed, mseed);
if (size <= 16) {
if (size == 0) {
// Return scrambled input seed.
return _mm_cvtsi128_si64(_mm_aesenc_si128(mseed, mseed));
} else if (size < 16) {
if ((((uintptr)(p) + 16) & 0xff0) != 0) {
static const uint64 masks[32]
__attribute__ ((aligned(16))) =
{
0x0000000000000000, 0x0000000000000000,
0x00000000000000ff, 0x0000000000000000,
0x000000000000ffff, 0x0000000000000000,
0x0000000000ffffff, 0x0000000000000000,
0x00000000ffffffff, 0x0000000000000000,
0x000000ffffffffff, 0x0000000000000000,
0x0000ffffffffffff, 0x0000000000000000,
0x00ffffffffffffff, 0x0000000000000000,
0xffffffffffffffff, 0x0000000000000000,
0xffffffffffffffff, 0x00000000000000ff,
0xffffffffffffffff, 0x000000000000ffff,
0xffffffffffffffff, 0x0000000000ffffff,
0xffffffffffffffff, 0x00000000ffffffff,
0xffffffffffffffff, 0x000000ffffffffff,
0xffffffffffffffff, 0x0000ffffffffffff,
0xffffffffffffffff, 0x00ffffffffffffff
};
// 16 bytes loaded at p won't cross a page
// boundary, so we can load directly.
mval = _mm_loadu_si128(p);
mval &= *(const __m128i*)(&masks[size*2]);
} else {
static const uint64 shifts[32]
__attribute__ ((aligned(16))) =
{
0x0000000000000000, 0x0000000000000000,
0xffffffffffffff0f, 0xffffffffffffffff,
0xffffffffffff0f0e, 0xffffffffffffffff,
0xffffffffff0f0e0d, 0xffffffffffffffff,
0xffffffff0f0e0d0c, 0xffffffffffffffff,
0xffffff0f0e0d0c0b, 0xffffffffffffffff,
0xffff0f0e0d0c0b0a, 0xffffffffffffffff,
0xff0f0e0d0c0b0a09, 0xffffffffffffffff,
0x0f0e0d0c0b0a0908, 0xffffffffffffffff,
0x0e0d0c0b0a090807, 0xffffffffffffff0f,
0x0d0c0b0a09080706, 0xffffffffffff0f0e,
0x0c0b0a0908070605, 0xffffffffff0f0e0d,
0x0b0a090807060504, 0xffffffff0f0e0d0c,
0x0a09080706050403, 0xffffff0f0e0d0c0b,
0x0908070605040302, 0xffff0f0e0d0c0b0a,
0x0807060504030201, 0xff0f0e0d0c0b0a09,
};
// address ends in 1111xxxx. Might be
// up against a page boundary, so load
// ending at last byte. Then shift
// bytes down using pshufb.
mval = _mm_loadu_si128((void*)((char*)p - 16 + size));
mval = _mm_shuffle_epi8(mval, *(const __m128i*)(&shifts[size*2]));
}
} else {
mval = _mm_loadu_si128(p);
}
// XOR data with seed.
mval ^= mseed;
// Scramble combo 3 times.
mval = _mm_aesenc_si128(mval, mval);
mval = _mm_aesenc_si128(mval, mval);
mval = _mm_aesenc_si128(mval, mval);
return _mm_cvtsi128_si64(mval);
} else if (size <= 32) {
// Make second starting seed.
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
// Load data to be hashed.
mval = _mm_loadu_si128(p);
mval2 = _mm_loadu_si128((void*)((char*)p + size - 16));
// XOR with seed.
mval ^= mseed;
mval2 ^= mseed2;
// Scramble 3 times.
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
// Combine results.
mval ^= mval2;
return _mm_cvtsi128_si64(mval);
} else if (size <= 64) {
// Make 3 more starting seeds.
mseed3 = mseed2;
mseed4 = mseed2;
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed3 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 32));
mseed4 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 48));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
mseed3 = _mm_aesenc_si128(mseed3, mseed3);
mseed4 = _mm_aesenc_si128(mseed4, mseed4);
mval = _mm_loadu_si128(p);
mval2 = _mm_loadu_si128((void*)((char*)p + 16));
mval3 = _mm_loadu_si128((void*)((char*)p + size - 32));
mval4 = _mm_loadu_si128((void*)((char*)p + size - 16));
mval ^= mseed;
mval2 ^= mseed2;
mval3 ^= mseed3;
mval4 ^= mseed4;
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval ^= mval3;
mval2 ^= mval4;
mval ^= mval2;
return _mm_cvtsi128_si64(mval);
} else if (size <= 128) {
// Make 7 more starting seeds.
mseed3 = mseed2;
mseed4 = mseed2;
mseed5 = mseed2;
mseed6 = mseed2;
mseed7 = mseed2;
mseed8 = mseed2;
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed3 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 32));
mseed4 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 48));
mseed5 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 64));
mseed6 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 80));
mseed7 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 96));
mseed8 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 112));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
mseed3 = _mm_aesenc_si128(mseed3, mseed3);
mseed4 = _mm_aesenc_si128(mseed4, mseed4);
mseed5 = _mm_aesenc_si128(mseed5, mseed5);
mseed6 = _mm_aesenc_si128(mseed6, mseed6);
mseed7 = _mm_aesenc_si128(mseed7, mseed7);
mseed8 = _mm_aesenc_si128(mseed8, mseed8);
// Load data.
mval = _mm_loadu_si128(p);
mval2 = _mm_loadu_si128((void*)((char*)p + 16));
mval3 = _mm_loadu_si128((void*)((char*)p + 32));
mval4 = _mm_loadu_si128((void*)((char*)p + 48));
mval5 = _mm_loadu_si128((void*)((char*)p + size - 64));
mval6 = _mm_loadu_si128((void*)((char*)p + size - 48));
mval7 = _mm_loadu_si128((void*)((char*)p + size - 32));
mval8 = _mm_loadu_si128((void*)((char*)p + size - 16));
// XOR with seed.
mval ^= mseed;
mval2 ^= mseed2;
mval3 ^= mseed3;
mval4 ^= mseed4;
mval5 ^= mseed5;
mval6 ^= mseed6;
mval7 ^= mseed7;
mval8 ^= mseed8;
// Scramble 3 times.
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
// Combine results.
mval ^= mval5;
mval2 ^= mval6;
mval3 ^= mval7;
mval4 ^= mval8;
mval ^= mval3;
mval2 ^= mval4;
mval ^= mval2;
return _mm_cvtsi128_si64(mval);
} else {
// Make 7 more starting seeds.
mseed3 = mseed2;
mseed4 = mseed2;
mseed5 = mseed2;
mseed6 = mseed2;
mseed7 = mseed2;
mseed8 = mseed2;
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed3 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 32));
mseed4 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 48));
mseed5 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 64));
mseed6 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 80));
mseed7 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 96));
mseed8 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 112));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
mseed3 = _mm_aesenc_si128(mseed3, mseed3);
mseed4 = _mm_aesenc_si128(mseed4, mseed4);
mseed5 = _mm_aesenc_si128(mseed5, mseed5);
mseed6 = _mm_aesenc_si128(mseed6, mseed6);
mseed7 = _mm_aesenc_si128(mseed7, mseed7);
mseed8 = _mm_aesenc_si128(mseed8, mseed8);
// Start with last (possibly overlapping) block.
mval = _mm_loadu_si128((void*)((char*)p + size - 128));
mval2 = _mm_loadu_si128((void*)((char*)p + size - 112));
mval3 = _mm_loadu_si128((void*)((char*)p + size - 96));
mval4 = _mm_loadu_si128((void*)((char*)p + size - 80));
mval5 = _mm_loadu_si128((void*)((char*)p + size - 64));
mval6 = _mm_loadu_si128((void*)((char*)p + size - 48));
mval7 = _mm_loadu_si128((void*)((char*)p + size - 32));
mval8 = _mm_loadu_si128((void*)((char*)p + size - 16));
// XOR in seed.
mval ^= mseed;
mval2 ^= mseed2;
mval3 ^= mseed3;
mval4 ^= mseed4;
mval5 ^= mseed5;
mval6 ^= mseed6;
mval7 ^= mseed7;
mval8 ^= mseed8;
// Compute number of remaining 128-byte blocks.
size--;
size >>= 7;
do {
// Scramble state.
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
// Scramble state, XOR in a block.
mval = _mm_aesenc_si128(mval, _mm_loadu_si128(p));
mval2 = _mm_aesenc_si128(mval2, _mm_loadu_si128((void*)((char*)p + 16)));
mval3 = _mm_aesenc_si128(mval3, _mm_loadu_si128((void*)((char*)p + 32)));
mval4 = _mm_aesenc_si128(mval4, _mm_loadu_si128((void*)((char*)p + 48)));
mval5 = _mm_aesenc_si128(mval5, _mm_loadu_si128((void*)((char*)p + 64)));
mval6 = _mm_aesenc_si128(mval6, _mm_loadu_si128((void*)((char*)p + 80)));
mval7 = _mm_aesenc_si128(mval7, _mm_loadu_si128((void*)((char*)p + 96)));
mval8 = _mm_aesenc_si128(mval8, _mm_loadu_si128((void*)((char*)p + 112)));
p = (void*)((char*)p + 128);
} while (--size > 0);
// 3 more scrambles to finish.
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval5 = _mm_aesenc_si128(mval5, mval5);
mval6 = _mm_aesenc_si128(mval6, mval6);
mval7 = _mm_aesenc_si128(mval7, mval7);
mval8 = _mm_aesenc_si128(mval8, mval8);
mval ^= mval5;
mval2 ^= mval6;
mval3 ^= mval7;
mval4 ^= mval8;
mval ^= mval3;
mval2 ^= mval4;
mval ^= mval2;
return _mm_cvtsi128_si64(mval);
}
}
#else // !defined(__x86_64__)
// The 32-bit version of aeshashbody.
uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
__m128i mseed, mseed2, mseed3, mseed4;
__m128i mval, mval2, mval3, mval4;
// Start with hash seed.
mseed = _mm_cvtsi32_si128(seed);
// Get 16 bits of length.
mseed = _mm_insert_epi16(mseed, size, 4);
// Replace size with its low 2 bytes repeated 4 times.
mseed = _mm_shufflehi_epi16(mseed, 0);
// Save unscrambled seed.
mseed2 = mseed;
// XOR in per-process seed.
mseed ^= _mm_loadu_si128(aeskeysched.__values);
// Scramble seed.
mseed = _mm_aesenc_si128(mseed, mseed);
if (size <= 16) {
if (size == 0) {
// Return scrambled input seed.
return _mm_cvtsi128_si32(_mm_aesenc_si128(mseed, mseed));
} else if (size < 16) {
if ((((uintptr)(p) + 16) & 0xff0) != 0) {
static const uint64 masks[32]
__attribute__ ((aligned(16))) =
{
0x0000000000000000, 0x0000000000000000,
0x00000000000000ff, 0x0000000000000000,
0x000000000000ffff, 0x0000000000000000,
0x0000000000ffffff, 0x0000000000000000,
0x00000000ffffffff, 0x0000000000000000,
0x000000ffffffffff, 0x0000000000000000,
0x0000ffffffffffff, 0x0000000000000000,
0x00ffffffffffffff, 0x0000000000000000,
0xffffffffffffffff, 0x0000000000000000,
0xffffffffffffffff, 0x00000000000000ff,
0xffffffffffffffff, 0x000000000000ffff,
0xffffffffffffffff, 0x0000000000ffffff,
0xffffffffffffffff, 0x00000000ffffffff,
0xffffffffffffffff, 0x000000ffffffffff,
0xffffffffffffffff, 0x0000ffffffffffff,
0xffffffffffffffff, 0x00ffffffffffffff
};
// 16 bytes loaded at p won't cross a page
// boundary, so we can load it directly.
mval = _mm_loadu_si128(p);
mval &= *(const __m128i*)(&masks[size*2]);
} else {
static const uint64 shifts[32]
__attribute__ ((aligned(16))) =
{
0x0000000000000000, 0x0000000000000000,
0xffffffffffffff0f, 0xffffffffffffffff,
0xffffffffffff0f0e, 0xffffffffffffffff,
0xffffffffff0f0e0d, 0xffffffffffffffff,
0xffffffff0f0e0d0c, 0xffffffffffffffff,
0xffffff0f0e0d0c0b, 0xffffffffffffffff,
0xffff0f0e0d0c0b0a, 0xffffffffffffffff,
0xff0f0e0d0c0b0a09, 0xffffffffffffffff,
0x0f0e0d0c0b0a0908, 0xffffffffffffffff,
0x0e0d0c0b0a090807, 0xffffffffffffff0f,
0x0d0c0b0a09080706, 0xffffffffffff0f0e,
0x0c0b0a0908070605, 0xffffffffff0f0e0d,
0x0b0a090807060504, 0xffffffff0f0e0d0c,
0x0a09080706050403, 0xffffff0f0e0d0c0b,
0x0908070605040302, 0xffff0f0e0d0c0b0a,
0x0807060504030201, 0xff0f0e0d0c0b0a09,
};
// address ends in 1111xxxx. Might be
// up against a page boundary, so load
// ending at last byte. Then shift
// bytes down using pshufb.
mval = _mm_loadu_si128((void*)((char*)p - 16 + size));
mval = _mm_shuffle_epi8(mval, *(const __m128i*)(&shifts[size*2]));
}
} else {
mval = _mm_loadu_si128(p);
}
// Scramble input, XOR in seed.
mval = _mm_aesenc_si128(mval, mseed);
mval = _mm_aesenc_si128(mval, mval);
mval = _mm_aesenc_si128(mval, mval);
return _mm_cvtsi128_si32(mval);
} else if (size <= 32) {
// Make second starting seed.
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
// Load data to be hashed.
mval = _mm_loadu_si128(p);
mval2 = _mm_loadu_si128((void*)((char*)p + size - 16));
// Scramble 3 times.
mval = _mm_aesenc_si128(mval, mseed);
mval2 = _mm_aesenc_si128(mval2, mseed2);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
// Combine results.
mval ^= mval2;
return _mm_cvtsi128_si32(mval);
} else if (size <= 64) {
// Make 3 more starting seeds.
mseed3 = mseed2;
mseed4 = mseed2;
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed3 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 32));
mseed4 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 48));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
mseed3 = _mm_aesenc_si128(mseed3, mseed3);
mseed4 = _mm_aesenc_si128(mseed4, mseed4);
mval = _mm_loadu_si128(p);
mval2 = _mm_loadu_si128((void*)((char*)p + 16));
mval3 = _mm_loadu_si128((void*)((char*)p + size - 32));
mval4 = _mm_loadu_si128((void*)((char*)p + size - 16));
mval = _mm_aesenc_si128(mval, mseed);
mval2 = _mm_aesenc_si128(mval2, mseed2);
mval3 = _mm_aesenc_si128(mval3, mseed3);
mval4 = _mm_aesenc_si128(mval4, mseed4);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval ^= mval3;
mval2 ^= mval4;
mval ^= mval2;
return _mm_cvtsi128_si32(mval);
} else {
// Make 3 more starting seeds.
mseed3 = mseed2;
mseed4 = mseed2;
mseed2 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 16));
mseed3 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 32));
mseed4 ^= _mm_loadu_si128((void*)((char*)aeskeysched.__values + 48));
mseed2 = _mm_aesenc_si128(mseed2, mseed2);
mseed3 = _mm_aesenc_si128(mseed3, mseed3);
mseed4 = _mm_aesenc_si128(mseed4, mseed4);
// Start with last (possibly overlapping) block.
mval = _mm_loadu_si128((void*)((char*)p + size - 64));
mval2 = _mm_loadu_si128((void*)((char*)p + size - 48));
mval3 = _mm_loadu_si128((void*)((char*)p + size - 32));
mval4 = _mm_loadu_si128((void*)((char*)p + size - 16));
// Scramble state once.
mval = _mm_aesenc_si128(mval, mseed);
mval2 = _mm_aesenc_si128(mval2, mseed2);
mval3 = _mm_aesenc_si128(mval3, mseed3);
mval4 = _mm_aesenc_si128(mval4, mseed4);
// Compute number of remaining 64-byte blocks.
size--;
size >>= 6;
do {
// Scramble state, XOR in a block.
mval = _mm_aesenc_si128(mval, _mm_loadu_si128(p));
mval2 = _mm_aesenc_si128(mval2, _mm_loadu_si128((void*)((char*)p + 16)));
mval3 = _mm_aesenc_si128(mval3, _mm_loadu_si128((void*)((char*)p + 32)));
mval4 = _mm_aesenc_si128(mval4, _mm_loadu_si128((void*)((char*)p + 48)));
// Scramble state.
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
p = (void*)((char*)p + 64);
} while (--size > 0);
// 2 more scrambles to finish.
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval = _mm_aesenc_si128(mval, mval);
mval2 = _mm_aesenc_si128(mval2, mval2);
mval3 = _mm_aesenc_si128(mval3, mval3);
mval4 = _mm_aesenc_si128(mval4, mval4);
mval ^= mval3;
mval2 ^= mval4;
mval ^= mval2;
return _mm_cvtsi128_si32(mval);
}
}
#endif // !defined(__x86_64__)
#else // !defined(__i386__) && !defined(__x86_64__)
uintptr aeshashbody(void* p, uintptr seed, uintptr size, Slice aeskeysched) {
// We should never get here on a non-x86 system.
runtime_throw("impossible call to aeshashbody");
}
#endif // !defined(__i386__) && !defined(__x86_64__)

1
libgo/runtime/go-libmain.c
View File

@ -61,6 +61,7 @@ initfn (int argc, char **argv, char** env __attribute__ ((unused)))
runtime_isarchive = true;
runtime_cpuinit ();
runtime_initsig(true);
a = (struct args *) malloc (sizeof *a);

1
libgo/runtime/go-main.c
View File

@ -47,6 +47,7 @@ main (int argc, char **argv)
runtime_isstarted = true;
__go_end = (uintptr)_end;
runtime_cpuinit ();
runtime_check ();
runtime_args (argc, (byte **) argv);
runtime_osinit ();

40
libgo/runtime/go-type-identity.c
View File

@ -9,44 +9,14 @@
#include "runtime.h"
#include "go-type.h"
/* An identity hash function for a type. This is used for types where
we can simply use the type value itself as a hash code. This is
true of, e.g., integers and pointers. */
/* The hash functions for types that can compare as identity is
written in Go. */
uintptr_t
__go_type_hash_identity (const void *key, uintptr_t seed, uintptr_t key_size)
{
uintptr_t ret;
uintptr_t i;
const unsigned char *p;
if (key_size <= 8)
{
union
{
uint64 v;
unsigned char a[8];
} u;
u.v = 0;
#ifdef WORDS_BIGENDIAN
__builtin_memcpy (&u.a[8 - key_size], key, key_size);
#else
__builtin_memcpy (&u.a[0], key, key_size);
#endif
if (sizeof (uintptr_t) >= 8)
return (uintptr_t) u.v ^ seed;
else
return (uintptr_t) ((u.v >> 32) ^ (u.v & 0xffffffff)) ^ seed;
}
ret = seed;
for (i = 0, p = (const unsigned char *) key; i < key_size; i++, p++)
ret = ret * 33 + *p;
return ret;
}
extern uintptr runtime_memhash(void *, uintptr, uintptr)
__asm__ (GOSYM_PREFIX "runtime.memhash");
const FuncVal __go_type_hash_identity_descriptor =
{ (void *) __go_type_hash_identity };
{ (void *) runtime_memhash };
/* An identity equality function for a type. This is used for types
where we can check for equality by checking that the values have

1
libgo/runtime/go-type.h
View File

@ -362,7 +362,6 @@ extern _Bool
__go_type_descriptors_equal(const struct __go_type_descriptor*,
const struct __go_type_descriptor*);
extern uintptr_t __go_type_hash_identity (const void *, uintptr_t, uintptr_t);
extern const FuncVal __go_type_hash_identity_descriptor;
extern _Bool __go_type_equal_identity (const void *, const void *, uintptr_t);
extern const FuncVal __go_type_equal_identity_descriptor;

3
libgo/runtime/proc.c
View File

@ -455,7 +455,8 @@ runtime_schedinit(void)
// runtime_symtabinit();
runtime_mallocinit();
mcommoninit(m);
runtime_alginit(); // maps must not be used before this call
// Initialize the itable value for newErrorCString,
// so that the next time it gets called, possibly
// in a fault during a garbage collection, it will not

6
libgo/runtime/runtime.h
View File

@ -265,6 +265,8 @@ struct __go_func_type;
void runtime_args(int32, byte**)
__asm__ (GOSYM_PREFIX "runtime.args");
void runtime_osinit();
void runtime_alginit(void)
__asm__ (GOSYM_PREFIX "runtime.alginit");
void runtime_goargs(void)
__asm__ (GOSYM_PREFIX "runtime.goargs");
void runtime_goenvs(void);
@ -592,3 +594,7 @@ extern void *getitab(const struct __go_type_descriptor *,
const struct __go_type_descriptor *,
_Bool)
__asm__ (GOSYM_PREFIX "runtime.getitab");
extern void runtime_cpuinit(void);
extern void setCpuidECX(uint32)
__asm__ (GOSYM_PREFIX "runtime.setCpuidECX");

19
libgo/runtime/runtime_c.c
View File

@ -6,6 +6,10 @@
#include <signal.h>
#include <unistd.h>
#if defined(__i386__) || defined(__x86_64__)
#include <cpuid.h>
#endif
#include "config.h"
#include "runtime.h"
@ -204,3 +208,18 @@ go_errno()
{
return (intgo)errno;
}
// CPU-specific initialization.
// Fetch CPUID info on x86.
void
runtime_cpuinit()
{
#if defined(__i386__) || defined(__x86_64__)
unsigned int eax, ebx, ecx, edx;
if (__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
setCpuidECX(ecx);
}
#endif
}