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Compiler-specific Features 4.7.59 __sel intrinsic This intrinsic inserts a SEL instruction into the instruction stream generated by the compiler. It enables you to select bytes from the input parameters, whereby the bytes that are selected depend upon the results of previous SIMD instruction intrinsics. The results of previous SIMD instruction intrinsics are represented by the Greater than or Equal flags in the Application Program Status Register (APSR). The __sel intrinsic works equally well on both halfword and byte operand intrinsic results. This is because halfword operand operations set two (duplicate) GE bits per value. For example, the __sasx intrinsic. unsigned int __sel(unsigned int val1, unsigned int val2) Where: val1 val2 holds four selectable bytes holds four selectable bytes. The __sel intrinsic selects bytes from the input parameters and returns them in the return value, res, according to the following criteria: if APSR.GE[0] == 1 then res[7:0] = val1[7:0] else res[7:0] = val2[7:0] if APSR.GE[1] == 1 then res[15:8] = val1[15:8] else res[15:8] = val2[15:8] if APSR.GE[2] == 1 then res[23:16] = val1[23:16] else res[23:16] = val2[23:16] if APSR.GE[3] == 1 then res[31;24] = val1[31:24] else res = val2[31:24] Example: unsigned int ge_filter(unsigned int val1, unsigned int val2) { unsigned int res; } res = __sel(val1,val2); return res; unsigned int foo(unsigned int a, unsigned int b) { int res; int filtered_res; } res = __sasx(a,b); /* This intrinsic sets the GE flags */ filtered_res = ge_filter(res); /* Filter the results of the __sasx */ /* intrinsic. Some results are filtered */ /* out based on the GE flags. */ return filtered_res; 4-134 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler-specific Features See also • __sadd16 intrinsic on page 4-130 • __sasx intrinsic on page 4-133 • __ssax intrinsic on page 4-155 • __ssub8 intrinsic on page 4-157 • __ssub16 intrinsic on page 4-156 • ARMv6 SIMD intrinsics on page 4-109 • Instruction summary on page 4-2 in the Assembler Guide • SEL on page 4-63 in the Assembler Guide. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 4-135 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 Selec
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Compiler Command-line Options Usage
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Compiler Command-line Options A num
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Compiler Command-line Options vfpv3
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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 3.3 C99 languag
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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 3.6 Standard C
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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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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 Examples
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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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Compiler-specific Features 4.5 Vari
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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 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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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 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 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 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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Using NEON Support Bitwise Select N
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