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6.43.2 Extended Asm - Assembler Instructions with C Expression Operands Extended asm syntax uses colons (' : ') to delimit the operand parameters after .. are several rules on the usage of stack-like registers in the operands of an asm . You can specify the name to be used in the assembler code for a C function or variable by writing the asm (or __asm__ ) keyword after the declarator. It is up toHere are specific details on what constraint letters you can use with asm operands. Constraints can say whether an operand may be in a register, and which 5.35 Assembler Instructions with C Expression Operands A colon separates the assembler template from the first output operand and another separates the .. There are several rules on the usage of stack-like regs in asm_operands insns. The typical use of extended asm statements is to manipulate input values to .. At a minimum, aliasing rules allow GCC to know what memory doesn't need to