I am attempting to use inline assembly to implement a tracing mechanism that results in code something like this (asm syntax not meant to be exact): "pre" C code... /* via inline asm */ j trace .pushsubsection 1000 trace: "trace" C code... /* via inline asm */ j post .popsubsection post: "post" C code... The idea is that the trace code can be nullified by changing the "j trace" instruction to a NOP or activated by putting the jump back. I have an implementation and it almost works. It malfunctions when applied on a large scale. I assume it is malfunctioning because gcc has placed essential side-effects in the trace block. How can I tell gcc not to move anything past the first asm? How can I tell it to not expect any computations in the trace block to get past the second asm? Both asm statements are currently volatile. I have experimented a little with "memory" clobbers without success. I need some help from an expert here. I am using gcc 4.1 and 4.3.3 if it matters. Joe Buehler
