RTL creation

[Danish Samad]

hello,

After reading the machine description manual I deduce
that named insruction patterns(in the .md file)  are
used to create unoptimized RTL instructions. Further
the manual also states that the RTL generation pass
only looks for names that are hard coded in the
compiler, other names will be ignored. After examinig
the source code I did not find any named patterns in
any file, except an enum in insn-output.c containing
named patterns. So how does gcc generate RTL
instructions from the tree? and exactly how are the
named patterns in the md file used to generate RTL?  

regards,
danish


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