Messages in this thread | | | From | MANIK RAINA <> | Date | Wed, 16 Dec 1998 20:44:55 +0530 (IST) | Subject | Re: [PATCH] 2.1.131: i386 tweak to switch_to() |
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> > "cc" is condition flags; "memory" is clobbered each time you write to > something that is not in the arguments. Clobbering "memory" is used to > singal gcc that it can't assume that memory is unchanged (i.e., reuse a > value in memory that just happens to be in a register), and also has the > side effect that it acts as a barrier: No reordering of instructions will > move stuff over the asm() because of the above.
further , memory as the cloberred operand means all registers are assumed cloberred and their contents are assumed to be unreliable .
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