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Profile-guided optimization. Profile-guided optimization ( PGO, sometimes pronounced as pogo [1] ), also known as profile-directed feedback ( PDF ), [2] and feedback-directed optimization ( FDO) [3] is a compiler optimization technique in computer programming that uses profiling to improve program runtime performance .
An example is the NX bit hardware feature, supported by Intel, AMD and ARM processors. Implementations GNU Compiler Collection (GCC) Stack-smashing protection was first implemented by StackGuard in 1997, and published at the 1998 USENIX Security Symposium. StackGuard was introduced as a set of patches to the Intel x86 backend of GCC 2.7.
Backdoor (computing) A backdoor is a typically covert method of bypassing normal authentication or encryption in a computer, product, embedded device (e.g. a home router ), or its embodiment (e.g. part of a cryptosystem, algorithm, chipset, or even a "homunculus computer"—a tiny computer-within-a-computer such as that found in Intel's AMT ...
Peephole optimization is an optimization technique performed on a small set of compiler-generated instructions; the small set is known as the peephole or window. [1] Peephole optimization involves changing the small set of instructions to an equivalent set that has better performance. For example: instead of pushing register A onto the stack ...
The GNU Compiler Collection ( GCC) is an optimizing compiler produced by the GNU Project supporting various programming languages, hardware architectures and operating systems. The Free Software Foundation (FSF) distributes GCC as free software under the GNU General Public License (GNU GPL). GCC is a key component of the GNU toolchain and the ...
C ( pronounced / ˈsiː / – like the letter c) [6] is a general-purpose computer programming language. It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems, device drivers, and ...
Executable-space protection. In computer security, executable-space protection marks memory regions as non-executable, such that an attempt to execute machine code in these regions will cause an exception. It makes use of hardware features such as the NX bit (no-execute bit), or in some cases software emulation of those features.
Ninja (build system) Ninja is a small build system developed by Evan Martin, [4] a Google employee. Ninja has a focus on speed and it differs from other build systems in two major respects: it is designed to have its input files generated by a higher-level build system, and it is designed to run builds as fast as possible.