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Compiler Command-line Options Note If you specify softvfp+vfpv2 with the --arm or --thumb option for C code, it ensures that your interworking floating-point code is compiled to use software floating-point linkage. softvfp+vfpv3 Selects a floating-point library with software floating-point linkage that targets the VFPv3 architecture. Select this option if you are interworking Thumb code with ARM code on a system that implements a VFPv3 unit. softvfp+vfpv3 is is available in RealView Development Suite 3.0 and later only. softvfp+vfpv3_fp16 Selects a floating-point library with software floating-point linkage that targets the VFPv3 architecture with half-precision floating-point extension support. softvfp+vfpv3_fp16 is available in RealView Development Suite 4.0 and later only. softvfp+vfpv3_d16 Selects a floating-point library with software floating-point linkage that targets the VFPv3-D16 architecture. softvfp+vfpv3_d16 is available in RealView Development Suite 4.0 and later only. softvfp+vfpv3_d16_fp16 Selects a floating-point library with software floating-point linkage that targets the VFPv3-D16 architecture, with half-precision floating-point extension support. softvfp+vfpv3_d16_fp16 is available in RealView Development Suite 4.0 and later only. Usage Any FPU explicitly selected using the --fpu option always overrides any FPU implicitly selected using the --cpu option. For example, the option cpu=ARM1136JF-S --fpu=softvfp generates code that uses the software floating-point library fplib, even though the choice of CPU implies the use of architecture VFPv2. 2-64 Copyright © 2007-2010 ARM. All rights reserved. ARM DUI 0348C Non-Confidential, ID101213
Compiler Command-line Options Restrictions For every CPU that can be specified with --cpu=name, the compiler permits any hardware VFP architecture to be specified using --fpu=name, providing that the target architecture inside the processor core is 5TE or later. Beyond the scope of the compiler, additional architectural constraints apply. For example, VFPv3 is not supported with architectures prior to ARMv7. The combination of --fpu and --cpu options permitted by the compiler does not necessarily translate to the actual device in use. If you specify an FPU implicitly using the --cpu option, that is incompatible with an FPU chosen explicitly using --fpu, the compiler generates an error. The compiler only generates scalar floating-point operations. If you want to use VFP vector operations, you must do this using assembly code. NEON support is disabled for softvfp. Default If a VFP coprocessor is present, VFP instructions are generated. If there is no VFP corprocessor, the compiler generates code that makes calls to the software floating-point library fplib to carry out floating-point operations. Note By default, some choices of processor or architecture imply the selection of a particular floating-point unit. For example, the option --cpu ARM1136JF-S implies the option --fpu vfpv2. See also • --arm on page 2-8 • --cpu=name on page 2-30 • --thumb on page 2-122 • __softfp on page 4-15 • Using floating-point arithmetic on page 5-31 in the Compiler User Guide • Floating-point build options on page 2-5 in the Developer Guide. ARM DUI 0348C Copyright © 2007-2010 ARM. All rights reserved. 2-65 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 Restr
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Compiler Command-line Options Defau
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Compiler Command-line Options Error
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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 3.2 C99 languag
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Language Extensions 3.3 C99 languag
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Language Extensions Restrictions Th
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Language Extensions static int y =
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Language Extensions 3.4.4 Dollar si
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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 GNU languag
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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 The func
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Compiler-specific Features Note The
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Compiler-specific Features Syntax _
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Compiler-specific Features See also
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Compiler-specific Features __weak v
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Compiler-specific Features When a c
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Compiler-specific Features Examples
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Compiler-specific Features Usage If
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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 Note Thi
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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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Compiler-specific Features In parti
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Compiler-specific Features 4.5.5 __
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Compiler-specific Features Note You
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Compiler-specific Features Default
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Compiler-specific Features This pra
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Compiler-specific Features Note Bot
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Compiler-specific Features 4.7 Inst
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Compiler-specific Features opcode2
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Compiler-specific Features Syntax v
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Compiler-specific Features Where: p
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Compiler-specific Features Syntax v
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Compiler-specific Features Restrict
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Compiler-specific Features 4.7.44 A
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Compiler-specific Features Table 4-
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Compiler-specific Features 4.7.47 A
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Compiler-specific Features • __uh
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Compiler-specific Features 4.8 VFP
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Compiler-specific Features 4.10 GNU
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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 Se
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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 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 // VLD4.16 {d0[0
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Using NEON Support // VST3.32 {d0,
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Using NEON Support // VST3.32 {d0[0
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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 uint32x2_t vcvt_
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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 Vector widening
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Using NEON Support int8x16_t vqabsq
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Using NEON Support Bitwise and int8
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Using NEON Support Bitwise Select N
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Using NEON Support E.3.31 Vector re
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