gcc inline assembly constraint
If you use the inline qualifier, then for inlining purposes the size of the asm ... Use the ' & ' constraint modifier (see Modifiers) on all output operands that must not ... ,In inline asm this constraint is only allowed if the operand is used exactly once in an instruction that can handle the side effects. Not using an operand with ' < ' in ...
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 gcc inline assembly constraint 相關參考資料
Using the GNU Compiler Collection (GCC): Constraints
Constraints can also require two operands to match. Side-effects aren't allowed in operands of inline asm , unless ' < ' or ' > ' constraints are used, because there is no gu... https://gcc.gnu.org Using the GNU Compiler Collection (GCC): Extended Asm
If you use the inline qualifier, then for inlining purposes the size of the asm ... Use the ' & ' constraint modifier (see Modifiers) on all output operands that must not ... https://gcc.gnu.org Simple Constraints - Using the GNU Compiler Collection (GCC)
In inline asm this constraint is only allowed if the operand is used exactly once in an instruction that can handle the side effects. Not using an operand with ' < ' in ... https://gcc.gnu.org Constraints - Using the GNU Compiler Collection (GCC)
Here 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 ... https://gcc.gnu.org Extended Asm - GCC, the GNU Compiler Collection
In an assembler instruction using asm , you can specify the operands of the ... Each has "f" as its operand constraint, saying that a floating point register is ... https://gcc.gnu.org Machine Constraints - Using the GNU Compiler Collection (GCC)
Each architecture defines additional constraints. These constraints are used by the compiler itself for instruction generation, as well as for asm statements; ... https://gcc.gnu.org 關於GNU Inline Assembly - My code works, I don't know why.
跳到 Constraints - <Constraints> ::= <Constraint Modifier> <Other Constraints> ... 器幫你挑一個最適合的方式處理對應於assembler template內的operand。 http://wen00072.github.io GCC inline assembly: constraints - Stack Overflow
1 Answer. So, the constraints used were: q , r , and g . For most two-operand instructions, at least one of the operands must be a register. So don't use m or g for both; use r for at least one of... https://stackoverflow.com |