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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 • Saturating instructions on page 4-93 in the Assembler Guide • Parallel add and subtract on page 4-99 in the Assembler Guide. 4-132 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features 4.7.58 __sasx intrinsic This intrinsic inserts an SASX instruction into the instruction stream generated by the compiler. It enables you to exchange the halfwords of the second operand, add the high halfwords and subtract the low halfwords. The GE bits in the APRS are set according to the results. unsigned int __sasx(unsigned int val1, unsigned int val2) Where: val1 val2 holds the first operand for the subtraction in the low halfword, and the first operand for the addition in the high halfword holds the second operand for the subtraction in the high halfword, and the second operand for the addition in the low halfword. The __sasx intrinsic returns: • the subtraction of the high halfword in the second operand from the low halfword in the first operand, in the low halfword of the return value • the addition of the high halfword in the first operand and the low halfword in the second operand, in the high halfword of the return value. Each bit in APSR.GE is set or cleared for each byte in the return value, depending on the results of the operation. If res is the return value, then: • if res[15:0] ≥ 0 then APSR.GE[1:0] = 11 else 00 • if res[31:16] ≥ 0 then APSR.GE[3:2] = 11 else 00. Example: unsigned int exchange_subtract_add(unsigned int val1, unsigned int val2) { unsigned int res; } res = __sasx(val1,val2); /* res[15:0] = val1[15:0] - val2[31:16] res[31:16] = val1[31:16] + val2[15:0] */ return res; 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. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-133 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 static int y =
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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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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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Chapter 5 C and C++ Implementation
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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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Appendix D C and C++ Compiler Imple
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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 int64x1_t vqsub_
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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 // VST1.8 {d0},
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Using NEON Support uint64x1x2_t vld
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Using NEON Support // VMLA.I16 d0,
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