TASKING VX-toolset for ARM User Guide

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TASKING VX-toolset for ARM User GuideConstraintcharacterRrnumberTypegeneral purpose register(64 bits)Operandr0 .. r11general purpose register r0 .. r11, lrtype of operand it isassociated withsame as%numberRemarkThumb mode r0 .. r7Based on the specified register, a register pairis formed (64-bit). For example r0r1.Thumb mode r0 .. r7Input constraint only. The number must refer toan output parameter. Indicates that %numberand number are the same register.Use %number.0 and %number.1 to indicate thefirst and second half of a register pair when usedin combination with R.Loops and conditional jumpsThe compiler does not detect loops with multiple __asm() statements or (conditional) jumps across__asm() statements and will generate incorrect code for the registers involved.If you want to create a loop with __asm(), the whole loop must be contained in a single __asm()statement. The same counts for (conditional) jumps. As a rule of thumb, all references to a label in an__asm() statement must be in that same statement. You can use numeric labels for these purposes.Example 1: no input or outputA simple example without input or output parameters. You can use any instruction or label. When it isrequired that a sequence of __asm() statements generates a contiguous sequence of instructions, thenthey can be best combined to a single __asm() statement. Compiler optimizations can insert instruction(s)in between __asm() statements. Note that you can use standard C escape sequences. Use newlinecharacters ‘\n’ to continue on a new line in a __asm() statement. For multi-line output, use tab characters'\t' to indent instructions.__asm( "nop\n""\tnop" );Example 2: using output parametersAssign the result of inline assembly to a variable. With the constraint r a general purpose register ischosen for the parameter; the compiler decides which register it uses. The %0 in the instruction templateis replaced with the name of this register. The compiler generates code to assign the result to the outputvariable.int out;void main( void ){__asm( "mov %0,#0xff": "=r" (out) );}Generated assembly code:6
C Language.L2:mov r0,#0xffldr r1,.L2str r0,[r1,#0]bx lr.size main,$-main.align 4.dwoutExample 3: using input parametersAssign a variable to a register. A register is chosen for the parameter because of the constraint r; thecompiler decides which register is best to use. The %0 in the instruction template is replaced with thename of this register.The compiler generates code to move the input variable to the input register. Becausethere are no output parameters, the output parameter list is empty. Only the colon has to be present.int in;void initreg( void ){__asm( "MOV R0,%0":: "r" (in) );}Generated assembly code:.L2:ldr r0,.L2ldr r0,[r0,#0]MOV R0,r0bx lr.size initreg,$-initreg.align 4.dwinExample 4: using input and output parametersAdd two C variables and assign the result to a third C variable. Registers are used for the input and outputparameters (constraint r, %0 for out, %1 for in1, %2 for in2 in the instruction template). The compilergenerates code to move the input expressions into the input registers and to assign the result to the outputvariable.int in1, in2, out;void add32( void ){__asm( "add %0, %1, %2": "=r" (out): "r" (in1), "r" (in2) );}7
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