Intel c compiler vectorization option code#
Intel (icc, icpc, ifort) usually gives fastest code on Intel architecture). pc 64 sets internal FPU precision to 53-bit significand. To see compiler warnings and diagnostic options: icc -help diag man gcc. For example, iterative operations like division and finding the square root can run faster if you lower the precision with the -pc option. Some floating-point algorithms are sensitive to the accuracy of the significand, or fractional part of the floating-point value. Options for Handling Floating-Point Exceptions -fpe For Intel EM64 only. warn interfaces Tells the compiler to generate an interface block for each routine in a source file the interface block is then checked with -warn interfaces. This option instructs the compiler to analyze and transform the program so that 64-bit pointers are shrunk to 32-bit pointers wherever it is legal and safe to do so. To use this option, you must also specify the -g option. A month ago was talk of GCC developers enabling the vectorizer at the common '-O2' optimization level and now that change has landed into the GCC 12 development code-base. Phoronix: GCC 12 Enables Auto-Vectorization For -O2 Optimization Level. debug all Enables debug information and control output of enhanced debug information. GCC 12 Enables Auto-Vectorization For -O2 Optimization Level. References to these variables are then likely to cause run-time errors that can help you detect coding errors. ftrapuv Traps uninitialized variables by setting any uninitialized local variables that are allocated on the stack to a value that is typically interpreted as a very large integer or an invalid address.
SPECfpratebase2006 compiler switches: Intel C/C++ compiler 18.0: -m64 -xCORE-AVX512 -ipo -O3. It is not implemented on structs, classes, unions or arrays. funroll-loops C++ code adds option -fno-fast-math. It is not implemented on dynamically allocated variables, extern variables or static variables. Runtime checking of undefined variables is only implemented on local, scalar variables. If a variable is read before it is written, a runtime error routine will be called. check-uninit Enables runtime checking for uninitialized variables. check uninit Checks for uninitialized scalar variables without the SAVE attribute. Once the program is debugged, omit this option to reduce executable program size and slightly improve runtime performance. Generates code to perform runtime checks on array subscript and character substring expressions. check all Checks for all runtime failures. Specifying -traceback will increase the size of the executable program, but has no impact on runtime execution speeds. Default is -O 2 -g Produces symbolic debug information in object file (implies -O 0 when another optimization option is not explicitly set) -traceback Tells the compiler to generate extra information in the object file to provide source file traceback information when a severe error occurs at runtime. Commonly Used Options for Debugging -O 0 Disables optimizations.
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