ARM Compiler toolchain v4.1 for ÂµVision Using the Compiler

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Using the Inline and Embedded Assemblers of the ARM Compiler 7.6 Inline assembler rules for compiler keywords __asm and asm The following rules apply to the __asm and asm keywords: • Multiple instructions on the same line must be separated with a semicolon (;). • If an instruction requires more than one line, line continuation must be specified with the backslash character (\). • For the multiple line format, C and C++ comments are permitted anywhere in the inline assembly language block. However, comments cannot be embedded in a line that contains multiple instructions. • The comma (,) is used as a separator in assembly language, so C expressions with the comma operator must be enclosed in parentheses to distinguish them: __asm { ADD x, y, (f(), z) } • Labels must be followed by a colon, :, like C and C++ labels. • An asm statement must be inside a C++ function. An asm statement can be used anywhere a C++ statement is expected. • Register names in the inline assembler are treated as C or C++ variables. They do not necessarily relate to the physical register of the same name. If the register is not declared as a C or C++ variable, the compiler generates a warning. • Registers must not be saved and restored in inline assembler. The compiler does this for you. Also, the inline assembler does not provide direct access to the physical registers. However, indirect access is provided through variables that act as virtual registers. If registers other than CPSR and SPSR are read without being written to, an error message is issued. For example: int f(int x) { __asm { STMFD sp!, {r0} // save r0 - illegal: read before write ADD r0, x, 1 EOR x, r0, x LDMFD sp!, {r0} // restore r0 - not needed. } return x; } The function must be written as: int f(int x) { int r0; __asm { ADD r0, x, 1 EOR x, r0, x } return x; } ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 7-9 ID061811 Non-Confidential
Using the Inline and Embedded Assemblers of the ARM Compiler 7.6.1 See also Concepts • Inline assembler support in the compiler on page 7-5 • Restrictions on inline assembler support in the compiler on page 7-6 • Restrictions on inline assembly operations in C and C++ code on page 7-11. ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 7-10 ID061811 Non-Confidential
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® ARM Compiler toolchain v4.1 for
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Contents ARM Compiler toolchain v4.
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Contents 5.19 Inline functions ....
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Contents 7.41 __mcall_is_virtual(D,
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Conventions and Feedback • the se
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Overview of the compiler 2.1 The co
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Overview of the compiler 2.3 The C
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Getting started with the Compiler
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Getting started with the Compiler 3
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Getting started with the Compiler
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Getting started with the Compiler R
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Chapter 4 Compiler Features The fol
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Compiler Features 4.1 Compiler intr
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Compiler Features 4.2 Performance b
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Compiler Features 4.4 Generic intri
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Compiler Features 4.10 Compiler sup
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Compiler Features 4.12 Texas Instru
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Compiler Features /* Declare PSR as
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Compiler Features 4.13.1 See also R
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Compiler Features 4.15 Compiler and
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Compiler Features Using the Linker:
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Compiler Features Reference Compile
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Compiler Features 4.19 Compiler sup
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Compiler Features 4.21 PreCompiled
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Compiler Features 4.23 PreCompiled
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Compiler Features Reference Compile
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Compiler Features 4.26 Obsolete Pre
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Compiler Features 4.28 Selectively
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Compiler Features 4.30 Message outp
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Compiler Features 4.32 Default comp
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Compiler Coding Practices • Guard
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Compiler Coding Practices • Exten
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Compiler Coding Practices 5.2 Compi
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Compiler Coding Practices 5.4 Selec
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Compiler Coding Practices In additi
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Compiler Coding Practices Table 5-4
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Compiler Coding Practices Table 5-6
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Compiler Coding Practices 5.9 Code
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Compiler Coding Practices 4. After
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Compiler Coding Practices 5.12 Meth
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Compiler Coding Practices 5.14 Meth
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Compiler Coding Practices 5.16 Func
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Compiler Coding Practices Reference
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Compiler Coding Practices • __val
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Compiler Coding Practices 5.20 Comp
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Compiler Coding Practices 5.21 Auto
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Compiler Coding Practices 5.23 Auto
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Compiler Coding Practices 5.25 Comp
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Compiler Coding Practices 5.27 Inli
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Compiler Coding Practices 5.28 Inli
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Compiler Coding Practices 5.30 Adva
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Compiler Coding Practices 5.32 Rele
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Compiler Coding Practices 5.34 The
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Compiler Coding Practices 5.36 Perf
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Compiler Coding Practices 5.38 Unal
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Compiler Coding Practices (LDR/STR/
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Compiler Coding Practices • Hexad
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Compiler Coding Practices 5.42 Exam
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Compiler Coding Practices 5.43 Vect
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Compiler Coding Practices 5.45 Impl
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Compiler Coding Practices 5.47 Half
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Compiler Coding Practices 5.49 Type
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ARM Compiler toolchain v4.1 for ÂµVision Using the Compiler

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