Avoid instructions that incur expensive length-changing prefix (LCP) stalls on some x86-64 implementations...

Avoid instructions that incur expensive length-changing prefix (LCP) stalls
on some x86-64 implementations, notably Core2 and Corei7. Specifically, a move of
a 16-bit constant into memory requires a length-changing prefix and can incur significant
penalties. Modified an old patch written by H.J to split such instructions
during peephole2.

2012-04-05  Teresa Johnson  <tejohnson@google.com>
	    H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.h (ix86_tune_indices): Add
	X86_TUNE_LCP_STALL.
	* config/i386/i386.md (move immediate to memory peephole2):
	Add cases for HImode move when LCP stall avoidance is needed.
	* config/i386/i386.c (initial_ix86_tune_features): Initialize
	X86_TUNE_LCP_STALL entry.

Co-Authored-By: H.J. Lu <hongjiu.lu@intel.com>

From-SVN: r186176

From-SVN: r186174

	PR target/52882
	* config/i386/i386.c (ix86_decompose_address): Allow VOIDmode
	CONST_INT operands, zero-extended with AND.

testsuite/ChangeLog:

	PR target/52882
	* gcc.target/i386/pr52882.c: New test.

From-SVN: r186170

	PR target/50751
	* config/sh/sh.c (sh_find_mov_disp_adjust): Take machine_mode as the
	first argument instead of mode size.  Move displacement calculations
	to ...
	(mov_insn_size, max_mov_insn_displacement, mov_insn_alignment_mask): 
	... these new functions.
	(disp_adjust): Remove max_mov_disp field.
	(sh_legitimate_index_p): Use max_mov_insn_displacement and
	mov_insn_alignment_mask.
	(sh_address_cost): Use max_mov_insn_displacement.

From-SVN: r186169

2012-04-05  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/arm/arm.md (arch): Add neon_onlya8 and neon_nota8.
	(arch_enabled): Handle new arch types.
	(one_cmpldi2): Add NEON support.

From-SVN: r186167

2012-04-05  Richard Guenther  <rguenther@suse.de>

	* lto-lang.c (LANG_HOOKS_CALLGRAPH_EXPAND_FUNCTION): Remove
	definition.

From-SVN: r186166

2012-04-05  Richard Guenther  <rguenther@suse.de>

	* gimple.c (walk_gimple_op): Compute val_only for the LHS
	of an assigment in the canonical way, avoiding is_gimple_mem_rhs.
	(is_gimple_mem_rhs, is_gimple_reg_rhs, is_gimple_stmt): Move ...
	* gimplify.c (is_gimple_mem_rhs, is_gimple_reg_rhs, is_gimple_stmt):
	... here and make static.
	* gimple.h (is_gimple_mem_rhs, is_gimple_reg_rhs, is_gimple_stmt):
	Remove.

From-SVN: r186165

2012-04-05  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-dse.c (dse_optimize_stmt): Remember the stmt
	basic-block before removing it.

From-SVN: r186164

gcc/testsuite:

2012-04-05  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
	    Dominique D'Humieures  <dominiq@lps.ens.fr>

	PR testsuite/52614
	* gcc.dg/vect/vect.exp: Use -fno-common on all targets.
	* gcc.dg/vect/costmodel/ppc/ppc-costmodel-vect.exp: Likewise.


Co-Authored-By: Dominique d'Humieres <dominiq@lps.ens.fr>

From-SVN: r186163

tree-ssanames.c (release_dead_ssa_names): Compact the SSA version namespace as we release the freelist.

2012-04-05  Richard Guenther  <rguenther@suse.de>

	* tree-ssanames.c (release_dead_ssa_names): Compact the SSA
	version namespace as we release the freelist.

From-SVN: r186162

	PR libgcj/52645
	* gnu/java/net/natPlainDatagramSocketImplPosix.cc (setOption):
	Restore HAVE_INET6 check.
	* gnu/java/net/natPlainDatagramSocketImplWin32.cc (setOption):
	Likewise.

From-SVN: r186161

2012-04-05  Richard Guenther  <rguenther@suse.de>

	* tree-nrv.c (tree_nrv): Release VDEFs.
	* tree-sra.c (sra_modify_constructor_assign): Likewise.
	(sra_modify_assign): Likewise.
	* tree-vect-stmts.c (vect_remove_stores): Likewise.
	* tree-vect-loop.c (vect_transform_loop): Likewise.
	* tree-ssa-dom.c (optimize_stmt): Likewise.
	* tree-vect-slp.c (vect_schedule_slp): Likewise.
	* tree-ssa-math-opts.c (execute_cse_sincos): Likewise.

From-SVN: r186160

2012-04-05  Richard Guenther  <rguenther@suse.de>

	* gimple-iterator.c (gsi_remove): Return whether EH edges need to be
	cleanup.
	* gimple.h (gsi_remove): Adjust.
	* tree-ssa-operands.c (unlink_stmt_vdef): Optimize.
	* tree-ssa-dom.c (optimize_stmt): Use gsi_remove result.
	* tree-ssa-dse.c (dse_optimize_stmt): Likewise.
	* tree-ssa-forwprop.c (remove_prop_source_from_use): Likewise.
	* tree-ssa-math-opts.c (execute_optimize_widening_mul): Likewise.
	* tree-ssa-pre.c (eliminate): Likewise.

From-SVN: r186159

From-SVN: r186158

2012-04-05  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>

	PR bootstrap/52840
	* src/Makefile.am (build-debug): Do not adjust vpath dir, remove
	Makefile.tmp
	* src/Makefile.in: Adjust as per above.

From-SVN: r186156

From-SVN: r186153

	* doc/rtl.texi (const_double): Document as sign-extending.
	* expmed.c (expand_mult): Ensure we don't use shift
	incorrectly.
	* emit-rtl.c (immed_double_int_const): Refine to state the
	value is signed.
	* simplify-rtx.c (mode_signbit_p): Add a fixme for wider than
	CONST_DOUBLE integers.
	(simplify_const_unary_operation, UNSIGNED_FLOAT): Ensure no
	negative values are converted.  Fix conversions bigger than
	HOST_BITS_PER_WIDE_INT.
	(simplify_binary_operation_1): Ensure we don't use shift
	incorrectly.
	(simplify_immed_subreg): Sign-extend CONST_DOUBLEs.
	* explow.c (plus_constant_mode): Add.
	(plus_constant): Implement with plus_constant_mode.
	* rtl.h (plus_constant_mode): Add.

From-SVN: r186147

From-SVN: r186144

	2012-03-28  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/52689
	* src/c++98/compatibility-ldbl.cc: Guard with PIC

From-SVN: r186142

2012-04-04  H.J. Lu  <hongjiu.lu@intel.com>

	PR libitm/52854
	* config/x86/target.h (gtm_jmpbuf): Replace long with long long
	for x86-64.

From-SVN: r186140

	PR c++/52845
	* decl.c (finish_function): Update fntype after deducing return type.

From-SVN: r186139

2012-04-04  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/52808
	* tracer.c (tail_duplicate): Do not tail-duplicate loop header
	blocks.
	* Makefile.in (tracer.o): Depend on $(CFGLOOP_H).

From-SVN: r186135

2012-04-04  Tristan Gingold  <gingold@adacore.com>

	* pex-unix.c (to_ptr32): Fix style.

From-SVN: r186134

2012-04-04  Tristan Gingold  <gingold@adacore.com>

	* expr.c (expand_expr_real_2): Handle larger sizetype in
	POINTER_PLUS_EXPR.

From-SVN: r186133

2012-04-04  Tristan Gingold  <gingold@adacore.com>

        * libgfortran.h: Include complex.h before math.h

From-SVN: r186131

From-SVN: r186128

From-SVN: r186123

re PR c++/52796 ([C++11] Initialization of primitive object with 0-length parameter pack fails to value-initialize)

	PR c++/52796
	* pt.c (tsubst_initializer_list): A pack expansion with no elements
	means value-initialization.

From-SVN: r186122

	* config/sh/t-sh (MULTILIB_MATCHES): Match m2a-single-only
	to m2a-single instead of m2e.

From-SVN: r186116

From-SVN: r186114

From-SVN: r186112

	* expr.c (get_bit_range): Add OFFSET parameter and adjust BITPOS.
	Change type of BITOFFSET to signed.  Make sure the lower bound of
	the computed range is non-negative by adjusting OFFSET and BITPOS.
	(expand_assignment): Adjust call to get_bit_range.

From-SVN: r186110

	* h8300/h8300.c (h8300_current_function_monitor_function_p):
	New function. Added to check monitor functions. 
	(h8300_option_override): Modified to generate error/warning 
	messages for invalid combinations of different command line 
	options.
	* h8300/h8300.md: Generate 'rte' for monitor functions. Do not
	save EXR on stack for monitor function in case of H8S target 
	when "-mno-exr" is passed.
	* h8300/h8300-protos.h 
	(h8300_current_function_monitor_function_p): Add prototype.
	* doc/invoke.texi: Document H8S options.

From-SVN: r186109

config/
2012-04-03  Tristan Gingold  <gingold@adacore.com>

	* mmap.m4: Use *vms* instead of vms*.

gcc/
2012-04-03  Tristan Gingold  <gingold@adacore.com>

	* configure.ac: Use GCC_AC_FUNC_MMAP_BLACKLIST instead
	of gcc_AC_FUNC_MMAP_BLACKLIST.
	* acinclude.m4 (gcc_AC_FUNC_MMAP_BLACKLIST): Remove.
	* Makefile.in (aclocal_deps): Add mmap.m4.
	* configure: Regenerate.
	* aclocal.m4: Regenerate.

libitm/
2012-04-03  Tristan Gingold  <gingold@adacore.com>

	* configure: Regenerate.

From-SVN: r186106

2012-04-03  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/52808
	* tracer.c (tail_duplicate): Return whether we have duplicated
	any block.
	(tracer): If we have duplicated any block, cleanup the CFG.
	* cfghooks.c (duplicate_block): If we duplicated a loop
	header but not its loop, destroy the loop because it now has
	multiple entries.
	* tree-ssa-threadupdate.c (thread_through_loop_header): Tell
	the cfg manipulation routines we are not creating a multiple
	entry loop.

	* gcc.dg/pr52808.c: New testcase.

From-SVN: r186104

2012-04-03  Tristan Gingold  <gingold@adacore.com>

	* config/vms/vms-c.c (vms_pragma_nomember_alignment): Handle
	'byte' alignment.
	(vms_c_common_override_options): Allow parameterless variadic
	functions.

From-SVN: r186102

	PR tree-optimization/52835
	* tree-data-ref.c (build_rdg): Return NULL if
	compute_data_dependences_for_loop failed.

	* gfortran.dg/pr52835.f90: New test.

From-SVN: r186101

	* varasm.c (initializer_constant_valid_for_bitfield_p): Return true
	for REAL_CST as well.
	(output_constructor): Use RECORD_OR_UNION_TYPE_P predicate.
	In the bitfield case, if the value is a REAL_CST, convert it first to
	an INTEGER_CST.

From-SVN: r186100

2012-04-02  H.J. Lu  <hongjiu.lu@intel.com>

	* config.gcc: Use i386/biarchx32.h instead of i386/biarch64.h
	for --with-abi={x32|mx32} or --with-multilib-list=mx32.
	(supported_defaults): Add abi for i[34567]86-*-* and x86_64-*-*.

	* config/i386/biarchx32.h: New.

From-SVN: r186099

From-SVN: r186097