Messages in this thread | | | Subject | Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc, mips, m68k, sh, cris to use it | From | Alan Cox <> | Date | 09 Aug 2002 01:11:11 +0100 |
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On Thu, 2002-08-08 at 23:40, Luca Barbieri wrote: > > The compiler can cache the value in a register > It shouldn't since it is volatile and the machine has instructions with > memory operands.
I'm curious what part of C99 guarantees that it must generate
add 1 to memory
not
load memory add 1 store memory
It certainly guarantees not to cache it for use next statement, but does it actually persuade the compiler to use direct operations on memory ?
I'm not a C99 language lawyer but genuinely curious
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