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libitm: Remove dead code and data.

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From-SVN: r232275
This commit is contained in:
Torvald Riegel 2016-01-12 14:57:45 +00:00 committed by Torvald Riegel
parent 1c3c7c4145
commit 0d1ed41261
9 changed files with 11 additions and 433 deletions
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11
libitm/ChangeLog
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@ -1,3 +1,14 @@
2016-01-12 Torvald Riegel <triegel@redhat.com>
* libitm_i.h (gtm_mask_stack): Remove.
* beginend.cc (gtm_stmlock_array, gtm_clock): Likewise.
* stmlock.h: Remove file.
* config/alpha/cacheline.h: Likewise.
* config/generic/cacheline.h: Likewise.
* config/powerpc/cacheline.h: Likewise.
* config/sparc/cacheline.h: Likewise.
* config/x86/cacheline.h: Likewise.
2016-01-04 Jakub Jelinek <jakub@redhat.com>
Update copyright years.

3
libitm/beginend.cc
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@ -36,9 +36,6 @@ gtm_rwlock GTM::gtm_thread::serial_lock;
gtm_thread *GTM::gtm_thread::list_of_threads = 0;
unsigned GTM::gtm_thread::number_of_threads = 0;
gtm_stmlock GTM::gtm_stmlock_array[LOCK_ARRAY_SIZE];
atomic<gtm_version> GTM::gtm_clock;
/* ??? Move elsewhere when we figure out library initialization. */
uint64_t GTM::gtm_spin_count_var = 1000;

38
libitm/config/alpha/cacheline.h
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@ -1,38 +0,0 @@
/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_ALPHA_CACHELINE_H
#define LIBITM_ALPHA_CACHELINE_H 1
// A cacheline is the smallest unit with which locks are associated.
// The current implementation of the _ITM_[RW] barriers assumes that
// all data types can fit (aligned) within a cachline, which means
// in practice sizeof(complex long double) is the smallest cacheline size.
// It ought to be small enough for efficient manipulation of the
// modification mask, below.
#define CACHELINE_SIZE 64
#include "config/generic/cacheline.h"
#endif // LIBITM_ALPHA_CACHELINE_H

58
libitm/config/generic/cacheline.h
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@ -1,58 +0,0 @@
/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_CACHELINE_H
#define LIBITM_CACHELINE_H 1
namespace GTM HIDDEN {
// A cacheline is the smallest unit with which locks are associated.
// The current implementation of the _ITM_[RW] barriers assumes that
// all data types can fit (aligned) within a cachline, which means
// in practice sizeof(complex long double) is the smallest cacheline size.
// It ought to be small enough for efficient manipulation of the
// modification mask, below.
#ifndef CACHELINE_SIZE
# define CACHELINE_SIZE 32
#endif
// A gtm_cacheline_mask stores a modified bit for every modified byte
// in the cacheline with which it is associated.
typedef sized_integral<CACHELINE_SIZE / 8>::type gtm_cacheline_mask;
union gtm_cacheline
{
// Byte access to the cacheline.
unsigned char b[CACHELINE_SIZE] __attribute__((aligned(CACHELINE_SIZE)));
// Larger sized access to the cacheline.
uint16_t u16[CACHELINE_SIZE / sizeof(uint16_t)];
uint32_t u32[CACHELINE_SIZE / sizeof(uint32_t)];
uint64_t u64[CACHELINE_SIZE / sizeof(uint64_t)];
gtm_word w[CACHELINE_SIZE / sizeof(gtm_word)];
};
} // namespace GTM
#endif // LIBITM_CACHELINE_H

42
libitm/config/powerpc/cacheline.h
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@ -1,42 +0,0 @@
/* Copyright (C) 2012-2016 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_POWERPC_CACHELINE_H
#define LIBITM_POWERPC_CACHELINE_H 1
// A cacheline is the smallest unit with which locks are associated.
// The current implementation of the _ITM_[RW] barriers assumes that
// all data types can fit (aligned) within a cachline, which means
// in practice sizeof(complex long double) is the smallest cacheline size.
// It ought to be small enough for efficient manipulation of the
// modification mask, below.
#if defined (__powerpc64__) || defined (__ppc64__)
# define CACHELINE_SIZE 64
#else
# define CACHELINE_SIZE 32
#endif
#include "config/generic/cacheline.h"
#endif // LIBITM_POWERPC_CACHELINE_H

41
libitm/config/sparc/cacheline.h
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@ -1,41 +0,0 @@
/* Copyright (C) 2012-2016 Free Software Foundation, Inc.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_SPARC_CACHELINE_H
#define LIBITM_SPARC_CACHELINE_H 1
// A cacheline is the smallest unit with which locks are associated.
// The current implementation of the _ITM_[RW] barriers assumes that
// all data types can fit (aligned) within a cachline, which means
// in practice sizeof(complex long double) is the smallest cacheline size.
// It ought to be small enough for efficient manipulation of the
// modification mask, below.
#ifdef __arch64__
# define CACHELINE_SIZE 64
#else
# define CACHELINE_SIZE 32
#endif
#include "config/generic/cacheline.h"
#endif // LIBITM_SPARC_CACHELINE_H

125
libitm/config/x86/cacheline.h
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@ -1,125 +0,0 @@
/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_CACHELINE_H
#define LIBITM_CACHELINE_H 1
// Minimum cacheline size is 32, due to both complex long double and __m256.
// There's no requirement that 64-bit use a 64-byte cacheline size, but do
// so for now to make sure everything is parameterized properly.
#ifdef __x86_64__
# define CACHELINE_SIZE 64
#else
# define CACHELINE_SIZE 32
#endif
namespace GTM HIDDEN {
// A gtm_cacheline_mask stores a modified bit for every modified byte
// in the cacheline with which it is associated.
typedef sized_integral<CACHELINE_SIZE / 8>::type gtm_cacheline_mask;
union gtm_cacheline
{
// Byte access to the cacheline.
unsigned char b[CACHELINE_SIZE] __attribute__((aligned(CACHELINE_SIZE)));
// Larger sized access to the cacheline.
uint16_t u16[CACHELINE_SIZE / sizeof(uint16_t)];
uint32_t u32[CACHELINE_SIZE / sizeof(uint32_t)];
uint64_t u64[CACHELINE_SIZE / sizeof(uint64_t)];
gtm_word w[CACHELINE_SIZE / sizeof(gtm_word)];
#ifdef __MMX__
__m64 m64[CACHELINE_SIZE / sizeof(__m64)];
#endif
#ifdef __SSE__
__m128 m128[CACHELINE_SIZE / sizeof(__m128)];
#endif
#ifdef __SSE2__
__m128i m128i[CACHELINE_SIZE / sizeof(__m128i)];
#endif
#ifdef __AVX__
__m256 m256[CACHELINE_SIZE / sizeof(__m256)];
__m256i m256i[CACHELINE_SIZE / sizeof(__m256i)];
#endif
#if defined(__SSE__) || defined(__AVX__)
// Copy S to D; only bother defining if we can do this more efficiently
// than the compiler-generated default implementation.
gtm_cacheline& operator= (const gtm_cacheline &s);
#endif // SSE, AVX
};
#if defined(__SSE__) || defined(__AVX__)
inline gtm_cacheline& ALWAYS_INLINE
gtm_cacheline::operator= (const gtm_cacheline & __restrict s)
{
#ifdef __AVX__
# define CP m256
# define TYPE __m256
#else
# define CP m128
# define TYPE __m128
#endif
TYPE w, x, y, z;
// ??? Wouldn't it be nice to have a pragma to tell the compiler
// to completely unroll a given loop?
switch (CACHELINE_SIZE / sizeof(TYPE))
{
case 1:
this->CP[0] = s.CP[0];
break;
case 2:
x = s.CP[0];
y = s.CP[1];
this->CP[0] = x;
this->CP[1] = y;
break;
case 4:
w = s.CP[0];
x = s.CP[1];
y = s.CP[2];
z = s.CP[3];
this->CP[0] = w;
this->CP[1] = x;
this->CP[2] = y;
this->CP[3] = z;
break;
default:
__builtin_trap ();
}
return *this;
#undef CP
#undef TYPE
}
#endif
} // namespace GTM
#endif // LIBITM_CACHELINE_H

4
libitm/libitm_i.h
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@ -82,8 +82,6 @@ enum gtm_restart_reason
#include "target.h"
#include "rwlock.h"
#include "aatree.h"
#include "cacheline.h"
#include "stmlock.h"
#include "dispatch.h"
#include "containers.h"
@ -354,8 +352,6 @@ extern abi_dispatch *dispatch_gl_wt();
extern abi_dispatch *dispatch_ml_wt();
extern abi_dispatch *dispatch_htm();
extern gtm_cacheline_mask gtm_mask_stack(gtm_cacheline *, gtm_cacheline_mask);
// Control variable for the HTM fastpath that uses serial mode as fallback.
// Non-zero if the HTM fastpath is enabled. See gtm_thread::begin_transaction.
// Accessed from assembly language, thus the "asm" specifier on

122
libitm/stmlock.h
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@ -1,122 +0,0 @@
/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef LIBITM_STMLOCK_H
#define LIBITM_STMLOCK_H 1
namespace GTM HIDDEN {
/* A versioned write lock on a cacheline. This must be wide enough to
store a pointer, and preferably wide enough to avoid overflowing the
version counter. Thus we use a "word", which should be 64-bits on
64-bit systems even when their pointer size is forced smaller. */
typedef gtm_word gtm_stmlock;
/* This has to be the same size as gtm_stmlock, we just use this name
for documentation purposes. */
typedef gtm_word gtm_version;
/* The maximum value a version number can have. This is a consequence
of having the low bit of gtm_stmlock reserved for the owned bit. */
#define GTM_VERSION_MAX (~(gtm_version)0 >> 1)
/* A value that may be used to indicate "uninitialized" for a version. */
#define GTM_VERSION_INVALID (~(gtm_version)0)
/* This bit is set when the write lock is held. When set, the balance of
the bits in the lock is a pointer that references STM backend specific
data; it is up to the STM backend to determine if this thread holds the
lock. If this bit is clear, the balance of the bits are the last
version number committed to the cacheline. */
static inline bool
gtm_stmlock_owned_p (gtm_stmlock lock)
{
return lock & 1;
}
static inline gtm_stmlock
gtm_stmlock_set_owned (void *data)
{
return (gtm_stmlock)(uintptr_t)data | 1;
}
static inline void *
gtm_stmlock_get_addr (gtm_stmlock lock)
{
return (void *)((uintptr_t)lock & ~(uintptr_t)1);
}
static inline gtm_version
gtm_stmlock_get_version (gtm_stmlock lock)
{
return lock >> 1;
}
static inline gtm_stmlock
gtm_stmlock_set_version (gtm_version ver)
{
return ver << 1;
}
/* We use a fixed set of locks for all memory, hashed into the
following table. */
#define LOCK_ARRAY_SIZE (1024 * 1024)
extern gtm_stmlock gtm_stmlock_array[LOCK_ARRAY_SIZE];
static inline gtm_stmlock *
gtm_get_stmlock (const gtm_cacheline *addr)
{
size_t idx = ((uintptr_t) addr / CACHELINE_SIZE) % LOCK_ARRAY_SIZE;
return gtm_stmlock_array + idx;
}
/* The current global version number. */
extern atomic<gtm_version> gtm_clock;
static inline gtm_version
gtm_get_clock (void)
{
atomic_thread_fence(memory_order_release);
return gtm_clock.load(memory_order_acquire);
}
static inline gtm_version
gtm_inc_clock (void)
{
/* ??? Here we have a choice, the pre-inc operator mapping to
__atomic_add_fetch with memory_order_seq_cst, or fetch_add
with memory_order_acq_rel plus another separate increment.
We really ought to recognize and optimize fetch_op(x) op x... */
gtm_version r = ++gtm_clock;
/* ??? Ought to handle wraparound for 32-bit. */
if (sizeof(r) < 8 && r > GTM_VERSION_MAX)
abort ();
return r;
}
} // namespace GTM
#endif // LIBITM_STMLOCK_H