Abt an RTL expression

[Andrew Haley]

This should not be posted to the gcc list.  You want gcc-help.

Mohamed Shafi writes:
 > Hello all,
 > 
 > Can anyone tell me what the below expression means ?

It's a memory clobber.  It doesn't actually do anything itself, but it
prevents expressions that touch memory from being moved over it.


 > (insn 38 37 40 4 (parallel [
 >             (asm_operands/v ("") ("") 0 [                          //line 2
 >                     (reg:SI 32 [ s5.1 ])
 >       //line 3
 >                 ]
 >                  [
 >                     (asm_input:SI ("r"))
 >      //line 6
 >                 ] ("test55.c") 42)
 >           //line 7
 >             (clobber (mem:BLK (scratch) [0 A8]))
 >   //line 8
 >         ]) -1 (nil)
 >     (nil))
 > 
 > in line 2,  what is the 0 for?
 > 
 > what does line 3 mean?what is it purpose ?
 > 
 > In line 7 test55.c is the file name . why is it needed and what is 42?
 > In line 8 what does [0 A8] mean?

Why is the filename needed?  For debugging.

As for the rest: I can't remember.  Read the source.

Andrew.