Error: Abc_CommandAbc9If(): Mapping of GIA has failed.

[spth]

Version

0.47 (also 0.40)

On which OS did this happen?

Linux

Reproduction Steps

Compile and install yosys 0.40 or yosys 0.47 (I did not try other versions) from the release tarball on Debian GNU/Linux testing on aarch64. I was not able to reproduce the issue using yosys 0.47 (I did not try other versions) on
Debian GNU/Linux testing on amd64.

Try to compile the attached Verilog source via yosys -l icesynth2.yosyslog -p "read_verilog -sv cpu2_nosv.v; synth_ice40 -top cpu -json icesynth2.json"

cpu2_nosv.v.gz

Expected Behavior

The source gets compiled.

Actual Behavior

I get an error message:

[…]
2.41.16.5. Executing ABC9.
Running ABC command: "<yosys-exe-dir>/yosys-abc" -s -f <abc-temp-dir>/abc.script 2>&1
ABC: ABC command line: "source <abc-temp-dir>/abc.script".
ABC: 
ABC: + read_lut <abc-temp-dir>/input.lut 
ABC: + read_box <abc-temp-dir>/input.box 
ABC: + &read <abc-temp-dir>/input.xaig 
ABC: + &ps 
ABC: <abc-temp-dir>/input : i/o =    134/    238  and =   13939  lev =  214 (10.84)  mem = 0.28 MB  box = 1129  bb = 145
ABC: + &scorr 
ABC: Warning: The network is combinational.
ABC: + &sweep 
ABC: + &dc2 
ABC: + &dch -f 
ABC: + &ps 
ABC: <abc-temp-dir>/input : i/o =    134/    238  and =   14626  lev =   60 (4.57)  mem = 0.27 MB  ch = 2028  box = 971  bb = 145
ABC: + &if -W 250 -v 
ABC: ** cmd error: aborting 'source <abc-temp-dir>/abc.script'
ABC: The command has to terminate. Boxes are not in a topological order.
ABC: The following information may help debugging (numbers are 0-based):
ABC: Input 0 of BoxA 379 (1stCI = 872; 1stCO = 1815) has TFI with CI 1005,
ABC: which corresponds to output 0 of BoxB 452 (1stCI = 1005; 1stCO = 2128).
ABC: In a correct topological order, BoxB should precede BoxA.
ABC: Error: Abc_CommandAbc9If(): Mapping of GIA has failed.

2.41.16.6. Executing AIGER frontend.
ERROR: Can't open input file `/tmp/yosys-abc-CVKznF/output.aig' for reading: No such file or directory

[povik]

Given the below this is probably a Yosys bug (not an ABC bug) in that we have prepared the XAIGER input wrong.

ABC: The command has to terminate. Boxes are not in a topological order.
ABC: The following information may help debugging (numbers are 0-based):
ABC: Input 0 of BoxA 379 (1stCI = 872; 1stCO = 1815) has TFI with CI 1005,
ABC: which corresponds to output 0 of BoxB 452 (1stCI = 1005; 1stCO = 2128).
ABC: In a correct topological order, BoxB should precede BoxA.