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- How to solve the error: asm operand has impossib . . .
You're probably using an "r" parameter and the compiler has run out of registers to give you Perhaps could use "g" instead Try with WOLFSSL_SP_SMALL *not* defined
- Constraints (Using the GNU Compiler Collection (GCC))
Side-effects aren’t allowed in operands of inline asm, unless ‘<’ or ‘>’ constraints are used, because there is no guarantee that the side effects will happen exactly once in an instruction that can update the addressing register
- ‘asm’ operand has impossible constraints - CSDN博客
本文探讨了在Ubuntu 14 04 2环境下使用gcc-4 8 2进行C内联汇编时遇到的错误。 主要分析了两种情况导致的错误：一是同一变量同时用于输出寄存器列表；二是指定了寄存器的变量又用于输出寄存器列表。 通过调整代码可以解决这些问题。 摘要生成于 C知道 ，由 DeepSeek-R1 满血版支持， 前往体验 > 当在c中内联汇编时，出现如题错误。 将同一变量同时用于输出寄存器列表可返回值，会导致此错误，只要将其中之一去除就好。 : "=a" (__res) 输出寄存器列表 : "D" (cs), "S" (ct), "c" (count) : "si", "di", "cx"); 将一个指定了寄存器的变量用于输出寄存器列表，会导致此错误，只要将其中之一去除就好。
- Assembly: Impossible constraint, why and how to fix?
When resolving the arguments to the inline assembly, the arguments don't match the constraints for the sbi instruction, which are I,I (two positive, 6-bit constants), because they are not constant but a registers content
- error: ‘asm’ operand has impossible constraints - CSDN博客
本文介绍了解决Linux内嵌汇编中出现的“error: ‘asm’ operand has impossible constraints”错误的方法。该错误通常是因为汇编指令中使用的寄存器在修改列表中重复声明所导致。文章通过具体示例解释了如何避免此类错误。
- build failure using mingw32: `error: asm operand has impossible . . .
Hm, constraint errors happen when compiling the SSSE3 asm implementation on a 32-bit CPU, because 32-bit CPUs with SSE support do not have the same number of SIMD registers as 64-bit CPUs (Such crazy hardware exists in the wild, for example the Atom N270 )
- 错误:使用gcc 32位时，‘asm’操作数有不可能的约束-腾讯云开发者社区-腾讯云
asm语句有5个具有寄存器约束的操作数，这意味着它需要5个单独的寄存器，但编译器只有4个可用。 因此，这些约束是不可能满足的。 一个简单的解决方案是通过在asm语句中删除EAX来释放寄存器。
- 72873 – error: ‘asm’ operand has impossible constraints
GCC Bugzilla – Bug 72873 error: ‘asm’ operand has impossible constraints Last modified: 2021-09-13 21:33:41 UTC
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