Not really, the other reply is right. Most registers are clobbered. FreeBASIC only passes the asm code inside the asm block directly to GAS (using the .intel_sy

Not really, the other reply is right. Most registers are clobbered. FreeBASIC only passes the asm code inside the asm block directly to GAS (using the .intel_syntax noprefix directive). As I said, the compiler is too dumb to figure out what registers are being used so as a safety measure it clobbers almost all of them (see Register Preservation here[1]). [1] https://documentation.help/FreeBASIC/KeyPgAsm.html https://documentation.help/FreeBASIC/KeyPgAsm.html