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Compiler-specific Features See also • ARMv6 SIMD intrinsics on page 4-109 • __sel intrinsic on page 4-134 • Instruction summary on page 4-2 in the Assembler Guide • Parallel add and subtract on page 4-99 in the Assembler Guide. 4-158 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features 4.7.82 __sxtab16 intrinsic This intrinsic inserts an SXTAB16 instruction into the instruction stream generated by the compiler. It enables you to extract two 8-bit values from the second operand (at bit positions [7:0] and [23:16]), sign-extend them to 16-bits each, and add the results to the first operand. unsigned int __sxtab16(unsigned int val1, unsigned int val2) Where: val1 val2 holds the values that the extracted and sign-extended values are added to holds the two 8-bit values to be extracted and sign-extended. The __sxtab16 intrinsic returns the addition of val1 and val2, where the 8-bit values in val2[7:0] and val2[23:16] have been extracted and sign-extended prior to the addition. Example: unsigned int extract_sign_extend_and_add(unsigned int val1, unsigned int val2) { unsigned int res; res = __sxtab16(val1,val2); /* res[15:0] = val1[15:0] + SignExtended(val2[7:0]) } return res; res[31:16] = val1[31:16] + SignExtended(val2[23:16]) */ See also • ARMv6 SIMD intrinsics on page 4-109 • Instruction summary on page 4-2 in the Assembler Guide • SXT, SXTA, UXT, and UXTA on page 4-109 in the Assembler Guide. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-159 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 Restr
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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 3.6.12 Structur
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Chapter 4 Compiler-specific Feature
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Compiler-specific Features Usage __
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Compiler-specific Features 4.3 Func
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C and C++ Implementation Details No
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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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Appendix D C and C++ Compiler Imple
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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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