Inline Assembly queries

[kernel mailz]

Hello All the gurus,

I've been fiddling my luck with gcc 4.3.2 inline assembly on powerpc
There are a few queries

1. asm volatile or simply asm produce the same assembly code.
Tried with a few examples but didnt find any difference by adding
volatile with asm

2. Use of "memory" and clobbered registers.

"memory" -
a. announce to the compiler that the memory has been modified
b. this instruction writes to some memory (other than a listed output)
and GCC shouldn’t cache memory values in registers across this asm.

I tried with stw and stwcx instruction, adding "memory" has no effect.

Is there any example scenerio where gcc would generate different
assembly by adding / removing "memory" ?


-TZ