On Monday 24 December 2012 17:26:47 Leif Ekblad wrote: > In the case of cpuid, the code is hardly performance sensitive, and > probably runs only at startup. An alternative solution for the broken code > here is to move the result from rbx to another register, and to > save/restore rbx. Currently, this is the only place in libgcc and newlib > affected by this problem.
it's not a question of performance. i can't remember how many various projects i've had to tweak the inline asm code to work with __PIC__ (either because it's going into shared library code or it's being built as a PIE). Andi's point is now we have to redo all of that work a 2nd time and handle two different cases depending on gcc version ? it'd be a _lot_ better if gcc were intelligent and end users didn't have to code crap like stuffing %ebx somewhere temporarily. -mike
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