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Compiler-specific Features See also • __sqrtf • VABS, VNEG, and VSQRT on page 5-95 in the Assembler Guide. 4.7.34 __sqrtf This intrinsic is a single-precision version of the __sqrtf intrinsic. It is functionally equivalent to __sqrt, except that: • it takes an argument of type float instead of an argument of type double • it returns a float value instead of a double value. See also • __sqrt on page 4-99 • VABS, VNEG, and VSQRT on page 5-95 in the Assembler Guide. 4.7.35 __ssat This intrinsic inserts an SSAT instruction into the instruction stream generated by the compiler. It enables you to saturate a signed value from within your C or C++ code. Syntax int __ssat(int val, unsigned int sat) Where: val sat Is the value to be saturated. Is the bit position to saturate to. sat must be in the range 1 to 32. Return value The __ssat intrinsic returns val saturated to the signed range –2 sat–1 ≤ x ≤ 2 sat–1 –1. Errors The compiler does not recognize the __ssat intrinsic when compiling for a target that does not support the SSAT instruction. The compiler generates either a warning or an error in this case. 4-100 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features See also • __usat on page 4-106 • SSAT and USAT on page 4-96 in the Assembler Guide. 4.7.36 __strex This intrinsic inserts an instruction of the form STREX[size] into the instruction stream generated by the compiler. It enables you to use an STREX instruction in your C or C++ code to store data to memory. Syntax int __strex(unsigned int val, volatile void *ptr) Where: val ptr is the value to be written to memory. points to the address of the data to be written to in memory. To specify the size of the data to be written, cast the parameter to an appropriate integral type. Table 4-11 Access widths supported by the __strex intrinsic Instruction Size of data stored C cast STREXB unsigned byte (char *) STREXH unsigned halfword (short *) STREX word (int *) Return value The __strex intrinsic returns: 0 if the STREX instruction succeeds 1 if the STREX instruction is locked out. Errors The compiler does not recognize the __strex intrinsic when compiling for a target that does not support the STREX instruction. The compiler generates either a warning or an error in this case. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-101 ID101213 Non-Confidential,
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® RealView Compilation Tools Versi
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Product Status The information in t
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Contents RealView Compilation Tools
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Preface This preface introduces the
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Preface Appendix A Via File Syntax
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Preface Other publications The foll
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Chapter 1 Introduction This chapter
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Introduction 1.2 Source language mo
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Introduction 1.3 Language extension
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Introduction • Compiling a C sour
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Chapter 2 Compiler Command-line Opt
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Compiler Command-line Options 2.1.2
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Compiler Command-line Options Each
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Compiler Command-line Options Note
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Compiler Command-line Options • -
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Compiler Command-line Options Defau
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Compiler Command-line Options Usage
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Chapter 3 Language Extensions This
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Language Extensions 3.1.2 #include_
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Language Extensions 3.5 Standard C+
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Language Extensions Example 3-2 Lin
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Language Extensions int counter __a
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Language Extensions 3.7.5 Character
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Language Extensions • You can use
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Language Extensions Errors The comp
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Chapter 4 Compiler-specific Feature
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Compiler-specific Features Usage __
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Compiler-specific Features Return v
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Compiler-specific Features Example
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Compiler-specific Features __weak v
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Compiler-specific Features 4.3 Func
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Compiler-specific Features 4.3.2 __
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Compiler-specific Features 4.3.11 _
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Compiler-specific Features 4.4 Type
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Compiler-specific Features • Bit-
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Chapter 5 C and C++ Implementation
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C and C++ Implementation Details th
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C and C++ Implementation Details
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C and C++ Implementation Details 5.
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C and C++ Implementation Details No
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C and C++ Implementation Details na
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C and C++ Implementation Details 5.
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Appendix A Via File Syntax This app
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Via File Syntax A.2 Syntax Via file
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Appendix B Standard C Implementatio
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Standard C Implementation Definitio
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Appendix C Standard C++ Implementat
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Standard C++ Implementation Definit
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Standard C++ Implementation Definit
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Appendix D C and C++ Compiler Imple
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C and C++ Compiler Implementation L
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C and C++ Compiler Implementation L
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Appendix E Using NEON Support This
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Using NEON Support E.2 Vector data
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Using NEON Support • Vector long
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Using NEON Support uint64x1_t vqadd
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Using NEON Support Vector multiply
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Using NEON Support uint32x2_t vcle_
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Using NEON Support uint16x4_t vabd_
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Using NEON Support Long pairwise ad
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Using NEON Support int16x8_t vqshlq
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Using NEON Support uint8x8_t vrshr_
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Using NEON Support Vector signed->u
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Using NEON Support uint8x16_t vld1q
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Using NEON Support int16x4_t lane);
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Using NEON Support // VST1.8 {d0},
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Using NEON Support uint64x1x2_t vld
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Using NEON Support float32x2x4_t vl
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Using NEON Support lane); // VLD2.8
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Using NEON Support // VLD4.16 {d0[0
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Using NEON Support // VST3.32 {d0,
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Using NEON Support uint8x8_t vset_l
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Using NEON Support float32x2_t vmov
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Using NEON Support // VMLA.I16 d0,
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Using NEON Support Vector long mult
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Using NEON Support Bitwise and int8
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