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Topic: Basic block

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Northern New Hampshire Correctional Facility

	Basic Block Machine Work
		To deck a block, all four corners of the block are measured to the centerline of the mains (crankshaft) to determine if the block is square (also to set deck height).
		If the block is off, the head surface is machined until it measures the same, rear to front and side to side (0.001 to maximum tolerance).
		Also, the block, when decked, is surfaced on a mill using a special squaring fixture to ensure a perfect 90-degree angle to the centerline of the crankshaft.
	www.circletrack.com /howto/4661 (1985 words)

	EPAA Vol. 7 No. 29 Veal & Schreiber: Block Scheduling Effects
		Block mathematics is an ideal format for obtaining more credits in mathematics, but the block format does little for mathematics achievement and conceptual understanding.
		Thus, the argument that block scheduling would allow more students to take more mathematics classes is true, the impact of the increased learning is not justified due to the lack of time and curriculum in the mathematics classes due to the shorter class hours in the block format.
		In essence, block mathematics is good for taking more mathematics classes and obtaining more graduation credits, but the block format per se does little to increase students' understanding of mathematics.
	epaa.asu.edu /epaa/v7n29.html (3558 words)

	PL/SQL help and tutorial (Site not responding. Last check: 2007-10-22)
		PL/SQL blocks come in three types, these are anonymous procedure, named procedure and named function.
		Blocks may be stored within an Oracle database as procedures, functions, packages (a group of blocks) and triggers.
		Block execution is terminated after an exception handling routine is executed.
	www.ilook.fsnet.co.uk /ora_sql/sqlplus03.htm (502 words)

	Control Flow Graph
		Basic block is a straight-line sequence of code that can be entered only at the beginning and leaved only at the end.
		The probability that control flow arrives via given edge to the destination basic block is called reverse probability and is not directly represented, but it may be easily computed from frequencies of basic blocks.
		At the moment, the basic block boundaries are maintained transparently during emitting instruction, so rarely there is need to move them manually (such as in case someone wants to output instruction outside basic block explicitly).
	www.ucw.cz /~hubicka/papers/proj/node18.html (2664 words)

	Designing a Basic Block Profiler
		A basic block is a maximal sequence of consecutive statements in which flow of control enters at the beginning and leaves at the end without halt or the possibility of branching except at the end.
		Basic blocks can be used to capture the control-flow information associated with a particular execution of a program.
		For each basic block in the program being profiled, the profiler is required to produce a count of the number of times execution flows through that basic block.
	www.cs.binghamton.edu /~zdu/zprof/zprof/NOTES.html (3007 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		To permit bidirectional motion, we use the post-dominator relation, which says that a basic block, PD, is a post-dominator of a basic block B if all paths from B to the function’s exit must pass through PD. Using this strategy, we similarly define post-idef and post-iuse sets.
		For a group of blocks to be a strongly connected component, there must be some path in the control flow graph from each node in the component to all the other nodes in the component.
		We define the density of each basic block as the number of nodes in the DDD divided by the number of instructions required for local scheduling.
	www.research.compaq.com /wrl/DECarchives/DTJ/DTJT05/DTJT05SC.TXT (7595 words)

	BASIC SOFTWARE SCHEDULING (Site not responding. Last check: 2007-10-22)
		A basic block is a code sequence that does not contain a branch or branch target within the sequence.
		Dependencies within a basic block are known except for dependencies on memory locations whose addresses are unknown to the scheduler.
		The data flow graph is constructed by scanning the basic block, either from top to bottom or bottom to top, noting which instructions use data that is produced by other instructions in the basic block.
	www.ee.pdx.edu /~oks/tutorial/chapter10.html (1261 words)

	[No title]
		Edges which reach the EXIT block are handled in the normal fashion inside the loop.
		(Each basic block in the flow graph must have at least one entry in the segment table.) The LCM algorithm is then run over the flow graph to determine where to place the sets to the highest-priority value in respect of first the first insn in any one block.
		BBNUM is the flow graph basic block this insn occurs in.
	www.opensource.apple.com /darwinsource/10.3/gcc_os-1256/gcc/lcm.c (3914 words)

	IMCC optimizer - (Site not responding. Last check: 2007-10-22)
		Basic blocks are the most important structure for optimization.
		A basic block identifies a block of instructions that will all execute in sequence without jumps into or out of that block.
		They are found by identifying backedges, where control passes from a tail block to the head of the loop.
	www.parrotcode.org /docs/imcc/optimizer.html (574 words)

	SALTO Primitives
		To be moved from one block to another, an instruction must be first removed from its original block, then inserted into the destination one.
		If the basic block has not been found in the abstract representation of the program, an error message is generated.
		-th basic block and its instructions from the control flow graph and updates the edges of the graph.
	www.irisa.fr /caps/projects/Salto/DOC/NODE18.HTM (2327 words)

	: Package EDU.purdue.cs.bloat.cfg
		Classes to represent a Java method as a control flow graph of basic blocks.
		A basic block is a sequence of code that is entered only in once place (e.g.
		blocks), certain properties of the control flow graph such as its dominator tree, and to visualize a control flow graph.
	www.cs.purdue.edu /s3/projects/bloat/docs/api/EDU/purdue/cs/bloat/cfg/package-summary.html (185 words)

	Basic Science Block
		The goal of the two-week block is to revisit specific basic science areas that are of particular significance to both Pediatrics and Ob/Gyn.
		At the end of each day, you will be asked to answer 5 multiple choice questions that tests the knowledge base you should have gained on that day.
		Successful completion of the Basic Science Block (Pass grade) will be considered in assignment of each of the separate Pediatrics and Ob/Gyn grades.
	www.urmc.rochester.edu /smded/Ped/Basic_Science_Block.htm (694 words)

	les activités scientifiques
		The assembly code of the program is split in smaller parts : basic blocks.
		A basic block is a sequence of one or more instructions with a single entry point and a single exit point.
		Based on the basic blocks and on syntactic information gathered during compilation, we build two logical representations of the analyzed source code: a control-flow graph and a syntax tree.
	www.irisa.fr /solidor/work/heptane-demo/fft_s.html (90 words)

	Block Merging (Site not responding. Last check: 2007-10-22)
		Some compilers limit optimizations to basic blocks, and benefit if the program graph can be transformed into a smaller number of larger basic blocks.
		The code fragment below shows the function after the basic blocks have been rearranged and combined into one large basic block.
		Note that the CSE (x + y) is much easier to identify, particularly for compilers that limit CSE Elimination to basic blocks.
	www.nullstone.com /htmls/category/merge.htm (283 words)

	ALTO -- A Link-Time Optimizer for the DEC Alpha
		Selecting a basic block to be printed implies that the function it occurs in is also selected.
		E.g., the command "sloop -f -l -b 1000" specifies that basic block 1000 should be printed, together with the function and the loop it occurs in; but "sloop -fl -b 1000" asks for basic block 1000 and function "l".
		When we pathinline a function all inlined basic blocks should be treated as if they are part of the critical path for subsequent inlines.
	www.cs.arizona.edu /alto/Doc/alto.html (5929 words)

	New Page 3
		The NYSORA classification of regional anesthesia procedures (See Techniques) to basic, inter-mediate and advanced is based on their clinical applicability, complexity of their performance, the frequency of their use in clinical practice in the US and their potential for complications.
		Additionally, the breakdown of regional techniques in these three categories can be used to tailor regional anesthesia workshops to the needs and levels of individual trainees.
		Basic nerve block procedures are technically easy to perform, have a low risk of compli-
	www.nysora.com /publications/pnb-classification.htm (245 words)

	Gmane -- Mail To News And Back Again
		/ + df_luids_set (df, blocks);* + + /* Recreate reg-def and reg-use chains from scratch so that first + def is at the head of the reg-def chain and the last use is at + the head of the reg-use chain.
		This is only important for + regs local to a basic block as it speeds up searching.
		basic blocks in BODY that are always executed.
	article.gmane.org /gmane.comp.gcc.patches/57675 (8265 words)

	[No title]
		Start with those registers that are known to be live at the end of the original basic block and get propagate_block to determine which registers are live.
		We may play the games with moving the named labels from one basic block to the other in case only one computed_jump is available.
		The case of a block ending in an unconditional jump to a block with multiple predecessors is not handled optimally.
	www.opensource.apple.com /darwinsource/10.3.2/gcc-1495/gcc/cfgrtl.c (5695 words)

	Extending Value Reuse to Basic Blocks with Compiler Support (Site not responding. Last check: 2007-10-22)
		About 16 to 41 percent of all the basic blocks are simply repeating earlier calculations when the programs are compiled with the -O2 optimization level in the GCC compiler.
		Compiler optimizations, such as loop-unrolling and function inlining, affect the sizes of basic blocks, but have no significant or consistent impact on their value locality, nor the resulting performance.
		Simulation results show that using a reasonably sized block history buffer to provide basic block reuse in a 4-way issue superscalar processor can improve execution time for the tested SPEC programs by 1 to 14 percent, with an overall average of 9 percent when using reasonable hardware assumptions.
	csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/trans/tc/&toc=comp/trans/tc/2000/04/t4toc.xml&DOI=10.1109/12.844346 (709 words)

	COMP 430: Project #2
		To identify the beginning and end of basic block, you could encode a special value within the Address or Operation field.
		This code block is introduced because the label associated with the bottom of the for loop is immediately followed by a right brace (}).
		This code block could be removed by restruction the code generation by putting the right brace (}) before the label.
	www.csun.edu /~steve/COMP_430/Project2 (735 words)

	[No title]
		For each basic block, a zero count is output (to mark the start of a block), then the line numbers of that block are listed.
		Since the code that finds spanning trees starts with block 0, low numbered edges are put on the spanning tree in preference to high numbered edges.
		First output the number of basic blocks, and then for every edge output the source and target basic block numbers.
	www.opensource.apple.com /darwinsource/10.3.3/gcc-1495/gcc/profile.c (2902 words)

	[No title]
		It records the beginnings and ends of the basic blocks in the vectors basic_block_head and basic_block_end, and the number of blocks in n_basic_blocks.
		It uses the basic block information to determine where each hard or pseudo register is live.
		To determine which registers are live after any insn, one can start from the beginning of the basic block and scan insns, noting which registers are set by each insn and which die there.
	www.mit.edu /afs/dev/software/gct/src/flow.c (3502 words)

	Basic Block Analysis
		Pass 1 identifies block headers and exit points, while pass 2 allots each of the BBs so found a unique, arbitrary number.
		Partitioning instructions into Basic Blocks (BB) is a useful aid in numerous optimizations.
		A Basic Block is a the sequence of (1 or more)consecutive instructions, starting with a unique entry instruction (header, aka leader), ending with an exit instruction that leads to another BB or ends the whole program (e.g.
	www.cs.pdx.edu /~herb/cs410f99/bblock.htm (1491 words)

	Using Blocks and Paths
		Once you override a block's value, the block displays a lock symbol and an "M" on the icon, indicating that it is locked and the override is manual.
		This command is useful if you have changed a block's values after you made them permanent, but you change your mind and want to undo the changes.
		Sometimes a block produces an error when it evaluates, in which case the block turns yellow and an error message appears.
	www.cs.fsu.edu /g2/nol/using_p2.htm (1735 words)

	Recreating 16th and 17th Century Clothing: The Renaissance Tailor
		After the basic block is developed, I'll go on to show how to make the pattern 'more period'.
		This particular method is a very simplified version of the body block technique used in most costume shops.
		Basically, you cut it out, sew it together, and discover any fit problems from there.
	www.vertetsable.com /demos_patterndraft.htm (1089 words)

	A Preliminary Exploration of Optimized Stack Code Generation
		Further reduction is not possible if we assume that the example is a complete basic code block, because the stack must be empty at the start and end of the block.
		It is well known that basic blocks in C programs tend to be rather short.
		In particular, it is not possible to eliminate local variables whose lifetimes cross basic block boundaries.
	www.ece.cmu.edu /~koopman/stack_compiler/stack_co.html (3161 words)

	Basic Block Reordering - GNU Project - Free Software Foundation (FSF)
		GCC now supports reordering of basic blocks to attempt to reduce the number of mis-predicted branches in the final executable.
		Without block reordering those statements will be inside the loop in the assembly output:
		Second, the code after "je.L5" up to and including the "jmp.L2" statement pollutes the instruction cache with code that is usually not executed.
	www.gnu.org /software/gcc/news/reorder.html (435 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The definition numbers should be assigned in program order in each basic block.
		The ordering of blocks does not matter Available Expressions: A list of numbered expressions (numbering from 1).
		For example, if expression 5 is r1+r2 and instructions 15 and 27 are: 15: add (s.32) t6 = r1, r2 27: add (s.32) t8 = r1, r2 Then the output line should read: expr 5 15 because instruction 15 is the earliest appearance of the expression r1+r2.
	www.eecg.toronto.edu /~voss/ece540/Slides/Assign2.doc (514 words)

	The Basic Block Cache (Site not responding. Last check: 2007-10-22)
		In this project, we are experimenting with a novel cache architecture, the Basic Block Based cache (Bcache).
		It is based on storing a basic block as a cache entity rather than a cache block (or line) as in conventional caches.
		The Bcache architecture will highlight a flexible line-size, partial decoding in cache memory, implicit instruction queues and deterministic future knowledge within the realm of a basic block.
	www.nd.edu /~nkalla/research/bcache/bcache.html (365 words)

	[No title]
		Control Flow, 1/24/01 ---------------------------------------------------------------- Basic Blocks Basic Block Optimizations Control Flow Graphs Dominators Loops Basic Blocks ------------ A basic block is a sequence of instructions with one entry point and one exit point.
		Creating basic blocks is easy: - Scan instructions for LEADERS A leader is: - the first instruction - a label - an instruction that follows a branch - Each leader starts a basic block which ends at the instruction before the next leader There are cases when the definition of a leader is different.
		Optimizations on Basic Blocks: (History: Most optimizations we cover in this course are global optimizations.
	www.cs.cmu.edu /afs/cs/academic/class/15745-s01/www/lectures/lect0124.txt (722 words)

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