On Tue, Oct 17, 2017 at 4:12 AM, Andrew Haley <aph@xxxxxxxxxx> wrote: > On 17/10/17 09:01, Jeffrey Walton wrote: >> On Tue, Oct 17, 2017 at 3:58 AM, Andrew Haley <aph@xxxxxxxxxx> wrote: >>> On 17/10/17 08:32, Jeffrey Walton wrote: >>>> GCC guesses wrong on occasion. It will remove code that has value that >>>> but does not produce an output because the language does not allow us >>>> to express it. >>>> >>>> The C language lacks what we need to express what we need to do. Its a >>>> failure of the C (and C++) committees. Its not a GCC failure. >>> >>> I disagree. If you want a bunch of asms to execute in a particular >>> order, add a memory clobber or some dependencies. It's not difficult >>> once you have the understanding. In this particular case, fixing it >>> is trivial, and there are many ways to do it. >> >> Forgive my ignorance... How does one do it without ASM and in a >> cross-platform fashion? > > I don't understand what you are asking. Sorry about that Andrew. I had two or three other use cases in mind when I wrote that. The use case offered by Brown requires it. Sorry again. Jeff
