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Regd GCC Compiler optimization flags


Hi all,

 The Gcc Compiler online
document(http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html)
specifies that 
"Not all optimizations are controlled directly by a
flag. Only optimizations that have a flag are listed.
"

Does this mean that for O1/O2/O3/Os optimization
levels, the compiler does some optimizations of which
only some of them  
have flags listed  ??? For example O1 consists of not
just these optimizations 
          -fdefer-pop 
          -fmerge-constants 
          -fthread-jumps 
          -floop-optimize 
          -fif-conversion 
          -fif-conversion2 
          -fdelayed-branch 
          


	
		
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