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Compiler User Guide

Conventions and Feedback Overview of the Compiler Getting Started with the Compiler Compiler Features Compiler intrinsics Performance benefits of compiler intrinsics ARM assembler instruction intrinsics supported by Generic intrinsics supported by the compiler Compiler intrinsics for controlling IRQ and FIQ in Compiler intrinsics for inserting optimization bar Compiler intrinsics for inserting native instructi Compiler intrinsics for Digital Signal Processing European Telecommunications Standards Institute (E Compiler support for European Telecommunications S Overflow and carry status flags for C and C++ code Texas Instruments (TI) C55x intrinsics for optimiz Compiler support for accessing registers using nam Pragmas recognized by the compiler Compiler and processor support for bit-banding Compiler type attribute, __attribute__((bitband)) --bitband compiler command-line option How the compiler handles bit-band objects placed o Compiler support for thread-local storage Compiler eight-byte alignment features Using compiler and linker support for symbol versi PreCompiled Header (PCH) files Automatic PreCompiled Header (PCH) file processing PreCompiled Header (PCH) file processing and the h PreCompiled Header (PCH) file creation requirement Compilation with multiple PreCompiled Header (PCH) Obsolete PreCompiled Header (PCH) files Manually specifying the filename and location of a Selectively applying PreCompiled Header (PCH) file Suppressing PreCompiled Header (PCH) file processi Message output during PreCompiled Header (PCH) pro Performance issues with PreCompiled Header (PCH) f Default compiler options that are affected by opti Compiler Coding Practices Compiler Diagnostic Messages Using the Inline and Embedded Assemblers of the AR

Compiler User Guide

Compiler intrinsics for Digital Signal Processing (DSP)

Compiler intrinsics for Digital Signal Processing (DSP)

The compiler provides intrinsics that assist in the implementation of DSP algorithms. These intrinsics introduce the appropriate target instructions for:

  • ARM, on architectures from ARMv5TE onwards

  • Thumb, on architectures with Thumb-2 technology.

Not every instruction has its own intrinsic. The compiler can combine several intrinsics, or combinations of intrinsics and C operators to generate more powerful instructions. For example, the ARMv5TE QDADD instruction is generated by a combination of __qadd and __qdbl.

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