Merge pull request #339 from hdl/autoname_fix

Fixes out of memory error with larger RTL blocks

synthesis/synth.tcl

@@ -61,7 +61,6 @@ yosys delete {*/t:$print}
 # useful names. At this stage it is mainly flipflops created by the `proc`
 # pass.
 yosys opt_clean -purge
-yosys autoname
 
 yosys synth -top $top
 
@@ -70,7 +69,6 @@ yosys synth -top $top
 # This should be done before techmapping where things can be converted
 # dramatically and having useful names is helpful for debugging.
 yosys opt_clean -purge
-yosys autoname
 
 # Technology mapping of adders
 if {[info exists ::env(ADDER_MAPPING)] && [file isfile $::env(ADDER_MAPPING)]} {
@@ -115,7 +113,6 @@ if {[info exists ::env(TIEHI_CELL_AND_PORT)] && [info exists ::env(TIELO_CELL_AN
 # useful names. At this stage it is anything generated by the techmapping
 # passes.
 yosys opt_clean -purge
-yosys autoname
 
 # write synthesized design
 set output $::env(OUTPUT)