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Compiler-specific Features • USAD8 and USADA8 on page 4-102 in the Assembler Guide. 4-178 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features 4.7.100 __usada8 intrinsic This intrinsic inserts a USADA8 instruction into the instruction stream generated by the compiler. It enables you to perform four unsigned 8-bit subtractions, and add the absolute values of the differences to a 32-bit accumulate operand. unsigned int __usada8(unsigned int val1, unsigned int val2, unsigned int val3) Where: val1 val2 val3 holds the first four 8-bit operands for the subtractions holds the second four 8-bit operands for the subtractions holds the accumulation value. The __usada8 intrinsic returns the sum of the absolute differences of the following bytes, added to the accumulation value: • the subtraction of the first byte in the second operand from the first byte in the first operand • the subtraction of the second byte in the second operand from the second byte in the first operand • the subtraction of the third byte in the second operand from the third byte in the first operand • the subtraction of the fourth byte in the second operand from the fourth byte in the first operand. Example: unsigned int subtract_add_diff_accumulate(unsigned int val1, unsigned int val2, unsigned int val3) { unsigned int res; } res = __usada8(val1,val2,val3); /* absdiff1 = val1[7:0] - val2[7:0] absdiff2 = val1[15:8] - val2[15:8] absdiff3 = val1[23:16] - val2[23:16] absdiff4 = val1[31:24] - val2[31:24] sum = absdiff1 + absdiff2 + absdiff3 + absdiff4 res[31:0] = sum[31:0] + val3[31:0] */ return res; See also • ARMv6 SIMD intrinsics on page 4-109 ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-179 ID101213 Non-Confidential,
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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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Using NEON Support E.2 Vector data
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