Description of compiler flags for Intel C++ Compiler 8.0 -------------------------------------------------------- -O2 Optimizes for speed. The -O2 option has the same effect as specifying the following options: -Og, -Oi, -Ot, -Oy, -Ob1, -Gf, -Gs, and -Gy. This options defaults to ON. -O3 Optimizes for speed. Enables high-level optimization. This level does not guarantee higher performance. Using this option may increase the compilation time. Impact on performance is application dependent, some applications may not see a performance improvement. -Oa[-] Assume [not assume] no aliasing -Obn Controls the compiler's inline expansion. The amount of inline expansion performed varies with the value of n as follows: 0: Disables inlining. 1: Enables (default) inlining of functions declared with the __inline keyword. Also enables inlining according to the C++ language. 2: Enables inlining of any function. However, the compiler decides which functions to inline. Enables interprocedural optimizations and has the same effect as -Qip. Default n=1. -Og Enables global optimizations. Default ON. -Ot Enables all speed optimizations. Overrides -Os -Oi[-] Enables/disables inline expansion of intrinsic functions. Default Enabled. -Ow[-] Assume[not assume] no aliasing within functions, but assume aliasing across calls. -Oy[-] Enables [disables] the use of the EBP register in optimizations. When you disable with -Oy-, the EBP register is used as frame pointer. Default Enabled. -Gf Enables string-pooling optimization. Default ON. -Gs[n] Disables stack-checking for routines with n or more bytes of local variables and compiler temporaries. Default: n=4096 -Gy Packages functions to enable linker optimization. Default ON. -Qax{K|W|N} Generates specialized code for processor specific codes K, W, N while also generating generic IA-32 code. K = Intel Pentium III and compatible Intel processors W = Intel Pentium 4 and compatible Intel processors N = Intel Pentium 4 and compatible Intel processors. These options also enable advanced data layout and code restructuring optimizations to improve memory accesses for Intel processors. -Qx{K|W|N} Generate specialized code to run exclusively on processors supporting the extensions indicated by as described above. -Qip Enables single-file interprocedural optimizations within a file. Same as -Ob2. -Qipo multi-file ip optimizations that includes: - inline function expansion - interprocedural constant propagation - monitoring module-level static variables - dead code elimination - propagation of function characteristics - passing arguments in registers - loop-invariant code motion -Qprof_gen Instruments the program for profiling: to get the execution count of each basic block. -Qprof_use Enables the use of profiling dynamic feedback information during optimization. Turns on -Qfnsplit. -Qrcd Enables[disables] fast conversions of floating-point to integer conversions. This option does not guarantee that any particular rounding mode will be used. -Qansi_alias[-] -Qansi_alias directs the compiler to assume[not assume] the following: - Arrays are not accessed out of bounds. - Pointers are not cast to non-pointer types, and vice-versa. - References to objects of two different scalar types cannot alias. For example, an object of type int cannot alias with an object of type float, or an object of type float cannot alias with an object of type double. If your program satisfies the above conditions, setting the -Qansi_alias flag will help the compiler better optimize the program. However, if your program does not satisfy one of the above conditions, the -Qansi_alias flag may lead the compiler to generate incorrect code. -Qcxx_features Enables both -GX and -GR as described below so C++ Runtime Type Information and Exception Handling are both enabled -GR[-] Enables[disables] C++ Run Time Type Information (RTTI). -GX[-] Enables[disables] C++ Exception Handling. -fast Maximize speed across the entire program. Turns on -O3 and -Qipo. -Qfp_port round fp results at assignments & casts (some speed impact) -Qprefetch Enable prefetch insertion. Default ON. -Qunroll[n] Specifies the maximum number of times to unroll a loop. n=0 disables loop unrolling. -Qoption,tool,optlist -Qoption passes an option specified by optlist to a tool, where optlist is a comma-separated list of options. tool Description ------------------------------------ cpp Specifies the compiler front-end preprocessor c Specifies the C++ compiler asm Specifies the assembler link Specifies the linker oplist Indicates one or more valid argument strings for the designated program. If the argument is a command-line option, you must include the hyphen. If the argument contains a space or tab character, you must enclose the entire argument in quotation characters (""). You must separate multiple arguments with commas -Qoption can be used with the -Qipo flag to refine IPO. The valid options that can be used for this purpose are: -ip_args_in_regs=0 Disables the passing of arguments in registers. -ip_ninl_max_stats=n Sets the valid max number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The number of intermediate language statements usually exceeds the actual number of source language statements. The default value for n is 230. The compiler uses a larger limit for user inline functions. -ip_ninl_min_stats=n Sets the valid min number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The default values for ip_ninl_min_stats are: IA-32 compiler: ip_ninl_min_stats = 7 -ip_ninl_max_total_stats=n Sets the maximum increase in size of a function, measured in intermediate language statements, due to inlining. n is a positive integer whose default value is 2000. shlW32M.lib: MicroQuill SmartHeap Library 7.0 available from http://www.microquill.com/ -Zp{1|2|4|8|16} Specifies the strictest alignment constraint for structure and union types as 1, 2. 4. 8 or 16 bytes. Default is 16. -arch:SSE Enables the compiler to use SSE instructions. -arch:SSE2 Enables the compiler to use SSE2 instructions. -EHc Specifies that C functions do not throw exceptions. Default ON. -G7 Target optimization to Intel Pentium 4 processors. Default ON. -ML Compiles and links with the static, single-thread C run time library. Default ON. -QA Enables all predefined macros and all assertions. Default ON. -Qfnsplit Enables function splitting. Default ON. -Qms1 Instructs the compiler to enable most Microsoft compatability bugs. Default ON. -Qmspp Enables Microsoft C++ 6.0 Processor Pack binary compatability. Default ON. -Qpc64 Enables floating-point significand precision control. The value is used to round the significand to the correct number of bits. The value must be either 32, 64, or 80. Default ON. -Qpchi Enables precompiled header files coexistence to reduce build time. Default ON. -Qsfalign8 May align stack for functions with 8 or 16 byte vars. Default ON. -Qvc7 Enables compatability with Visual C++ .NET. Default ON. -Qvec_report1 Indicate vectorized loops in diagnostic information. Default ON. -vmb Selects the smallest representation for pointers to members. Use this option if you define each class before you declare a pointer to a member of the class. Default ON. Description of compiler flags for Intel C++ Compiler 9.0 -------------------------------------------------------- -O2 Optimizes for speed. The -O2 option includes the following options: -Og, -Oi-, -Os, -Oy, -Ob1, and -Gs This options defaults to ON. This option also enables. * inlining of intrinsics * Intra-file interprocedural optimizations including: * inlining * constant propagation * forward substitution * routine attribute propagation * variable address-taken analysis * dead static function elimination * removal of unreferenced variables. * The following performance optimizations: * copy propogation. * dead-code elimination * global register allocation * global instruction scheduling and control speculation * loop unrolliing * optimized code selection * partial redundancy elimination * strength reduction/induction variable simplification * variable renaming * exception handling optimizations * tail recursions * peephole optimizations * structure assignment lowering and optimizations * dead store elimination -O3 Optimizes for speed. Enables high-level optimization. This level does not guarantee higher performance. Using this option may increase the compilation time. Impact on performance is application dependent, some applications may not see a performance improvement. The optimizations include: * All optimizations done with -O2 * loop unrolling, including instruction scheduling * code replication to eliminate branches * padding the size of certain power-of-two arrays to allow more efficient cache use. * When used with -Qax or -Qx, it causes the compiler to perform more aggressive data dependency analysis than for -O2. -Oa[-] Assume [not assume] no aliasing. Default Disabled. -Obn Controls the compiler's inline expansion. The amount of inline expansion performed varies with the value of n as follows: 0: Disables inlining. Statement functions are always inlined. 1: Enables (default) inlining of functions declared with the __inline keyword. Also enables inlining according to the C++ language. 2: Enables inlining of any function. However, the compiler decides which functions to inline. Enables interprocedural optimizations and has the same effect as -Qip. Default n=2. -Og Enables global optimizations. Default ON. -Ot Enables all speed optimizations. Overrides -Os -Oi[-] Enables/disables inline expansion of intrinsic functions. Default Enabled. -Ow[-] Assume[not assume] no cross function aliasing. -Oy[-] Enables [disables] the use of the EBP register in optimizations. When you disable with -Oy-, the EBP register is used as frame pointer. -Oy has the effect of reducing the number of general-purpose registers by 1, and can produce slightly less efficient code. Default Enabled. -Gf Enables string-pooling optimization. -Gs[n] Disables stack-checking for routines with n or more bytes of local variables and compiler temporaries. Default: n=4096 -Gy Packages functions to enable linker optimization. Default ON. -Qax{K|W|N} Generates specialized code for processor specific codes K, W, N while also generating generic IA-32 code. K = Intel Pentium III and compatible Intel processors W = Intel Pentium 4 and compatible Intel processors N = Intel Pentium 4 and compatible Intel processors. These options also enable advanced data layout and code restructuring optimizations to improve memory accesses for Intel processors. -Qx{K|W|N} Generate specialized code to run exclusively on processors supporting the extensions indicated by as described above. -Qip Enables single-file interprocedural optimizations within a file. -Qipo Enables multi-file ip optimizations which allows inline function expansion for calls to functions defined in separate files. The compiler decides whether to create one or more object files based on an estimate of the size of the application. It generates one object file for small applications and two for large ones. -Qprof_gen Instruments the program for profiling: to get the execution count of each basic block. -Qprof_use Enables the use of profiling dynamic feedback information during optimization. Turns on -Qfnsplit. Forces function grouping. -Qrcd Enables[disables] fast conversions of floating-point to integer conversions. This option does not guarantee that any particular rounding mode will be used. -Qansi_alias[-] -Qansi_alias directs the compiler to assume the following: - Arrays are not accessed out of bounds. - Pointers are not cast to non-pointer types, and vice-versa. - References to objects of two different scalar types cannot alias. For example, an object of type int cannot alias with an object of type float, or an object of type float cannot alias with an object of type double. If your program satisfies the above conditions, setting the -Qansi_alias flag will help the compiler better optimize the program. However, if your program does not satisfy one of the above conditions, the -Qansi_alias flag may lead the compiler to generate incorrect code. -GR[-] Enables[disables] C++ Run Time Type Information (RTTI). -GX[-] Enables[disables] C++ Exception Handling. Default Disabled. -fast Maximize speed across the entire program. Turns on -O3, -Qipo, -Qprec-div-, and -QxP. -Qfp_port round fp results at assignments & casts (some speed impact) -Qprefetch Enable prefetch insertion. Default ON. -Qunroll[n] Specifies the maximum number of times to unroll a loop. n=0 disables loop unrolling. Default: the compiler uses default heuristics when unrolling loops. -Qoption,tool,optlist -Qoption passes an option specified by optlist to a tool, where optlist is a comma-separated list of options. tool Description ------------------------------------ cpp Specifies the compiler front-end preprocessor c Specifies the C++ compiler asm Specifies the assembler link Specifies the linker oplist Indicates one or more valid argument strings for the designated program. If the argument is a command-line option, you must include the hyphen. If the argument contains a space or tab character, you must enclose the entire argument in quotation characters (""). You must separate multiple arguments with commas NOTE: If 'tool' is incorrectly specified, the compiler gives an warning and the option is ignored. For example, if -Qoption,f,... is used with the Intel C++ compiler, the option is ignored with an warning. -Qoption can be used with the -Qipo flag to refine IPO. The valid options that can be used for this purpose are: -ip_args_in_regs=0 Disables the passing of arguments in registers. -ip_ninl_max_stats=n Sets the valid max number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The number of intermediate language statements usually exceeds the actual number of source language statements. The default value for n is 230. The compiler uses a larger limit for user inline functions. -ip_ninl_min_stats=n Sets the valid min number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The default values for ip_ninl_min_stats are: IA-32 compiler: ip_ninl_min_stats = 7 -ip_ninl_max_total_stats=n Sets the maximum increase in size of a function, measured in intermediate language statements, due to inlining. n is a positive integer whose default value is 2000. shlW32M.lib: MicroQuill SmartHeap Library 7.0 available from http://www.microquill.com/ -Zp{1|2|4|8|16} Specifies the strictest alignment constraint for structure and union types as 1, 2. 4. 8 or 16 bytes. Default is 16. -arch:SSE Enables the compiler to use SSE instructions. -arch:SSE2 Enables the compiler to use SSE2 instructions. -Qprec-div[-] Enables[disables] improved precision of floating-point divides. Disabling may slightly improve speed. Default Enabled. -Qpc64 Enables floating-point significand precision control. The value is used to round the significand to the correct number of bits. The value must be either 32, 64, or 80. Default ON. Description of compiler flags for Intel Fortran Compiler 9.0 ------------------------------------------------------------ -O2 Optimizes for speed. The -O2 option includes the following options: -Og, Ot, -Oy, -Ob1, and -Gs This options defaults to ON. This option also enables. * inlining of intrinsics * Intra-file interprocedural optimizations including: * inlining * constant propagation * forward substitution * routine attribute propagation * variable address-taken analysis * dead static function elimination * removal of unreferenced variables. * The following performance optimizations: * copy propogation. * dead-code elimination * global register allocation * global instruction scheduling and control speculation * loop unrolliing * optimized code selection * partial redundancy elimination * strength reduction/induction variable simplification * variable renaming * exception handling optimizations * tail recursions * peephole optimizations * structure assignment lowering and optimizations * dead store elimination -O3 Optimizes for speed. Enables high-level optimization. This level does not guarantee higher performance. Using this option may increase the compilation time. Impact on performance is application dependent, some applications may not see a performance improvement. The optimizations include: * All optimizations done with -O2 * loop unrolling, including instruction scheduling * code replication to eliminate branches * padding the size of certain power-of-two arrays to allow more efficient cache use. * When used with -Qax or -Qx, it causes the compiler to perform more aggressive data dependency analysis than for -O2. -Oa[-] Assume [not assume] no aliasing -Ob{0|1|2} Controls the compiler's inline expansion. The amount of inline expansion performed varies as follows: -Ob0: Disable inlining. -Ob1: Disables (default) inlining unless -Qip or -Ob2 is specified. Enables inlining of functions. -Ob2: Enables inlining of any function. However, the compiler decides which functions to inline. Enables interprocedural optimizations and has the same effect as -Qip. -Og Enables global optimizations. -Ot Enables all speed optimizations. -Oi[-] Enables/disables inline expansion of intrinsic functions -Ow[-] Assume[not assume] no cross-function aliasing. -Ox Same as the -O2 option: enables -Gs, and -Ob1, -Og, -Oy, and -Ot. -Oy[-] Enables [disables] the use of the EBP register in optimizations. When you disable with -Oy-, the EBP register is used as frame pointer. -auto Determines whether local variables are put on the run-time stack. -Gf Enables string-pooling optimization. -Gs[n] Disables stack-checking for routines with n or more bytes of local variables and compiler temporaries. Default: n=4096 -Gy Packages functions to enable linker optimization. -fast Maximize speed across the entire program. Turns on -O3, -Qprec-div-, -QxP, and -Qipo. -Qax{K|W|N|P} Generates specialized code for processor specific codes K, W, N, P while also generating generic IA-32 code. K = Intel Pentium III and compatible Intel processors W = Intel Pentium 4 and compatible Intel processors N = Intel Pentium 4 and compatible Intel processors. These option also enable advanced data layout and code restructuring optimizations to improve memory accesses for Intel processors. P = Intel Pentium 4 processor with Streaming SIMD 3 (SSE3) support. These option also enable advanced data layout and code restructuring optimizations to improve memory accesses for Intel processors. -Qx{K|W|N|P} Generate specialized code to run exclusively on processors supporting the extensions indicated by as described above. -Qip Enables single-file interprocedural optimizations within a file. -Qipo multi-file ip optimizations that includes: - inline function expansion - interprocedural constant propagation - monitoring module-level static variables - dead code elimination - propagation of function characteristics - passing arguments in registers - loop-invariant code motion -Qprof_gen Instruments the program for profiling: to get the execution count of each basic block. -Qprof_use Enables the use of profiling dynamic feedback information during optimization. -Qrcd Enables[disables] fast conversions of floating-point to integer conversions. This option does not guarantee that any particular rounding mode will be used. -Qansi_alias Enables (default) or disables the compiler to assume that the program adheres to the ANSI Fortran type aliasablility rules. For example, an object of type real cannot be accessed as an integer. You should see the ANSI Standard for the complete set of rules. -Qscalar_rep[-] Enables[disables] scalar replacement performed during loop transformations. (requires /O3). -Qunroll[n] Specifies the maximum number of times to unroll a loop. n=0 disables loop unrolling. -Qprefetch[-] Enables[disables] prefetch insertion (requires -O3). -Qoption,tool,optlist -Qoption passes an option specified by optlist to a tool, where optlist is a comma-separated list of options. tool Description ------------------------------------ fpp Specifies the Fortran preprocessor f Specifies the Fortran compiler asm Specifies the assembler link Specifies the linker oplist Indicates one or more valid argument strings for the designated tool. You must separate multiple arguments with commas. -Qoption can be used with the -Qipo flag to refine IPO. The valid option list that can be used for this purpose are -ip_args_in_regs=0 Disables the passing of arguments in registers. -ip_ninl_max_stats=n Sets the valid max number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The number of intermediate language statements usually exceeds the actual number of source language statements. The default value for n is 230. The compiler uses a larger limit for user inline functions. -ip_ninl_min_stats=n Sets the valid min number of intermediate language statements for a function that is expanded in line. The number n is a positive integer. The default values for ip_ninl_min_stats are: IA-32 compiler: ip_ninl_min_stats = 7 -ip_ninl_max_total_stats=n Sets the maximum increase in size of a function, measured in intermediate language statements, due to inlining. n is a positive integer whose default value is 2000. shlW32M.lib: MicroQuill SmartHeap Library 7.0 available from http://www.microquill.com/ -Zp{1|2|4|8|16} Specifies the strictest alignment constraint for structure and union types as 1, 2. 4. 8 or 16 bytes. Default is 16. -Qprec-div[-] Enables[disables] improved precision of floating-point divides. Disabling may slightly improve speed. Default Enabled. Other Notes: ------------ "/" and "-" are both allowable starting tokens for flags passed to the compiler i.e. -QxK and /QxK are identical switches. Compiler options for PGI Fortran compiler 6.0 for Windows XP IA32 ----------------------------------------------------------------- The optimization levels and their meanings are as follows: -lacml Link with the AMD Core Math Library 2.5.3, packaged with the compiler. Also available at www.amd.com -O0 A basic block is generated for each Fortran statement. No scheduling is done between statements. No global optimizations are performed. -O1 Scheduling within extended basic blocks is performed. Some register allocation is performed. No global optimizations are performed. -O2 All level 1 optimizations are performed. In addition, scalar optimizations such as induction recognition and loop invariant motion are performed by the global optimizer. -O3 This level performs all level-one and level-two optimizations and enables more aggressive hoisting and scalar replacement optimizations. -fast Equivalent to "-O2 -Munroll=c:1 -Mnoframe -Mlre" -fastsse Equivalent to "-fast -Mscalarsse -Mvect=sse -Mcache_align -Mflushz" -Mpfi Generate profile feedback instrumentation; this includes extra code to collect run-time statistics to be used in a subsequent compile; -Mpfi must also appear when the program is linked. When the program is run, a profile feedback file pgfi.out will be generated; see -Mpfo. -Mpfo Enable profile feedback optimizations; there must be a profile feedback file pgfi.out in the current directory, which contains the result of an execution of the program compiled with -Mpfi. -Mcache_align Align unconstrained objects of length greater than or equal to 16 bytes on cache-line boundaries. An unconstrained object is a data object that is not a member of an aggregate structure or common block. This option does not affect the alignment of allocatable or automatic arrays. Note: To effect cache-line alignment of stack-based local variables, the main program or function must be compiled with -Mcache_align. -Mfixed Process source using Fortran90 freeform specifications. -Mflushz Set SSE MXCSR register to flush-to-zero mode. -Mipa=[option] Enables interprocedural analysis with the specified option. The valid options are: -Mipa=align Instructs the IPA to recognize when pointer targets are all cache-line aligned, allowing better SSE code generation. -Mipa=arg Instructs the IPA to remove arguments replaced by -Mipa=ptr,const -Mipa=const Enable propagation of constants across procedure calls. -Mipa=fast Equivalent to: -Mipa=align,arg,const,globals,f90ptr,shape,localarg,ptr,vestigial -Mipa=f90ptr Enable Fortran 90 pointer disambiguation across procdure calls. -Mipa=globals Instructs the IPA to optimize references to globals when not used in procedure calls. -Mipa=inline Automatically determine which functions to inline -Mipa=safe Assume unknown function references are safe -Mipa=localarg Externalizes local variables for use with -Mipa=arg -Mipa=ptr Instructs the IPA to perform pointer disambiguation across procedure calls. -Mipa=vestigial Instructs the IPA to eliminate functions that are not called. -Mlre Enables loop-carried redundancy elimination. -Mnoframe Eliminate operations that set up a true stack frame pointer for functions. -Mnovect Disables the vectorizer. -Mscalarsse Utilize the SSE (Streaming SIMD(Single Instruction Multiple Data) Extensions) and SSE2 instructions to perform the operations coded. This implies -Mflushz. -Munix Use UNIX calling conventions, no trailing underscores. -Munroll Invokes the loop unroller. This also sets the optimization level to 2 if the level is set to less than 2. :m Instructs the compiler to completely unroll loops with a constant loop count less than or equal to m, a supplied constant. If this value is not supplied, the m count is set to 4. n:u Instructs the compiler to unroll u times, a loop which is not completely unrolled, or has a non-constant loop count. If u is not supplied, the unroller computes the number of times a candidate loop is unrolled. -Mvect=sse Instructs the vectorizer to search for loops, and where possible, use the SSE or SSE2 and prefetch instructions (depending on which processor is targeted). Compiler options for PGI C compiler 6.0 for Windows XP ------------------------------------------------------ The optimization levels and their meanings are as follows: -lacml Link with the AMD Core Math Library 2.5.3. Available from www.amd.com -O0 A basic block is generated for each C statement. No scheduling is done between statements. No global optimizations are performed. -O1 Scheduling within extended basic blocks is performed. Some register allocation is performed. No global optimizations are performed. -O2 All level 1 optimizations are performed. In addition, scalar optimizations such as induction recognition and loop invariant motion are performed by the global optimizer. -O3 This level performs all level-one and level-two optimizations and enables more aggressive hoisting and scalar replacement optimizations. -fast Equivalent to "-O2 -Munroll=c:1 -Mnoframe -Mlre" -fastsse Equivalent to "-fast -Mscalarsse -Mvect=sse -Mcache_align -Mflushz" -Mpfi Generate profile feedback instrumentation; this includes extra code to collect run-time statistics to be used in a subsequent compile; -Mpfi must also appear when the program is linked. When the program is run, a profile feedback file pgfi.out will be generated; see -Mpfo. -Mpfo Enable profile feedback optimizations; there must be a profile feedback file pgfi.out in the current directory, which contains the result of an execution of the program compiled with -Mpfi. -Mcache_align Align unconstrained objects of length greater than or equal to 16 bytes on cache-line boundaries. An unconstrained object is a data object that is not a member of an aggregate structure or common block. This option does not affect the alignment of allocatable or automatic arrays. Note: To effect cache-line alignment of stack-based local variables, the main program or function must be compiled with -Mcache_align. -Mflushz Set SSE MXCSR register to flush-to-zero mode. -Mipa=[option] Enables interprocedural analysis with the specified option. The valid options are: -Mipa=align Instructs the IPA to recognize when pointer targets are all cache-line aligned, allowing better SSE code generation. -Mipa=arg Instructs the IPA to remove arguments replaced by -Mipa=ptr,const -Mipa=const Enable propagation of constants across procedure calls. -Mipa=fast Equivalent to: -Mipa=align,arg,const,globals,f90ptr,shape,localarg,ptr,vestigial -Mipa=f90ptr Enable Fortran 90 pointer disambiguation across procdure calls. -Mipa=globals Instructs the IPA to optimize references to globals when not used in procedure calls. -Mipa=inline Automatically determine which functions to inline -Mipa=safe Assume unknown function references are safe -Mipa=localarg Externalizes local variables for use with -Mipa=arg -Mipa=ptr Instructs the IPA to perform pointer disambiguation across procedure calls. -Mipa=vestigial Instructs the IPA to eliminate functions that are not called. -Mlre Enables loop-carried redundancy elimination. -Mnoframe Eliminate operations that set up a true stack frame pointer for functions. -Mnovect Disables the vectorizer. -Mscalarsse Utilize the SSE (Streaming SIMD(Single Instruction Multiple Data) Extensions) and SSE2 instructions to perform the operations coded. This implies -Mflushz. -Munix Use UNIX calling conventions, no trailing underscores. -Munroll Invokes the loop unroller. This also sets the optimization level to 2 if the level is set to less than 2. c:m Instructs the compiler to completely unroll loops with a constant loop count less than or equal to m, a supplied constant. If this value is not supplied, the m count is set to 4. n:u Instructs the compiler to unroll u times, a loop which is not completely unrolled, or has a non-constant loop count. If u is not supplied, the unroller computes the number of times a candidate loop is unrolled. -Mvect=sse Instructs the vectorizer to search for loops, and where possible, use the SSE or SSE2 and prefetch instructions (depending on which processor is targeted). Description of the 'start' command used for rate runs: ------------------------------------------------------ Starts a separate window to run a specified program or command. START ["title"] [/D path] [/I] [/MIN] [/MAX] [/SEPARATE | /SHARED] [/LOW | /NORMAL | /HIGH | /REALTIME | /ABOVENORMAL | /BELOWNORMAL] [/AFFINITY ] [/WAIT] [/B] [command/program] [parameters] "title" Title to display in window title bar. path Starting directory B Start application without creating a new window. The application has ^C handling ignored. Unless the application enables ^C processing, ^Break is the only way to interrupt the application I The new environment will be the original environment passed to the cmd.exe and not the current environment. MIN Start window minimized MAX Start window maximized SEPARATE Start 16-bit Windows program in separate memory space SHARED Start 16-bit Windows program in shared memory space LOW Start application in the IDLE priority class NORMAL Start application in the NORMAL priority class HIGH Start application in the HIGH priority class REALTIME Start application in the REALTIME priority class ABOVENORMAL Start application in the ABOVENORMAL priority class BELOWNORMAL Start application in the BELOWNORMAL priority class AFFINITY The new application will have the specified processor affinity mask, expressed as a hexadecimal number. WAIT Start application and wait for it to terminate command/program If it is an internal cmd command or a batch file then the command processor is run with the /K switch to cmd.exe. This means that the window will remain after the command has been run. If it is not an internal cmd command or batch file then it is a program and will run as either a windowed application or a console application. parameters These are the parameters passed to the command/program Portability options for CPU2000: ------------------------------- 176.gcc: -Dalloca=_alloca : so as to use the built-in optimized alloca /Fn : 176.gcc uses alloca and this options tells the linker to pre-allocate n bytes of stack. The default amount of stack allocated is not enough and 176.gcc crashes with a run-time error 178.galgel: -Mfixed : Assume free-format source 186.crafty: -DNT_i386 : Specifies that it is a Windows NT Intel processor-based system which makes the compiler use "long long" as the 64-bit variable that 186.crafty needs. 253.perlbmk: -DSPEC_CPU2000_NTOS : This enables the code changes for porting to Windows get included. -DPERLDLL : On Windows, we need a perl.exe instead of a perl.exe and perl.dll. This pre-define ensures that the changes necessary to get a single, UNIX-style executable without getting the indirect calls that can cause a 10% performance degradation. This allows the Windows-based executable to be as close as possible to the Unix-based one. /MT : Use the static multi-threaded library else it will not compile. 254.gap: -DSYS_HAS_CALLOC_PROTO : -DSYS_HAS_MALLOC_PROTO : These two pre-defines tell of the existence of malloc and calloc prototypes. Meaning of BIOS flags used in ASUS A8NSLI motherboard Tcl=2 CAS# Latency specifies the CAS#-to-read-data-valid Trc=12 Row cycle Time specifies the RAS#-active to RAS#-active or auto refresh of the same bank 1T/2T Memory Timings=1T specifies that DRAM commands and addresses will be driven for 1 clock cycle and qualified with an associated chip select on the second phase of the 1 clock command and address