Failing plan after PR #15 when axis are swapped

[DStrelak]

When XY axes are swapped, plan estimation fails.
Original code (before PR #15) :

$ ./cuFFTAdvisor -find 10 -x 2400 -y 1000 -n 1000
rank|placeness|type|data|X|Y|Z|batch|plan size estimate (MB)|plan size estimate 2 (MB)|plan size actual (MB)|data size (MB)|plan time (ms)|exec time (ms/signal)|exec time of batch (ms)|elements|performance (1k elem of signal/ms)|error message
many|out-of-place|R2R forward|float|2400|1024|1|128|1200.0000000000|1200.0000000000|1200.0000000000|2401.0000000000|1.0390000343|0.2964499891|37.9455986023|314572800|8290.1005859375|
many|out-of-place|R2R inverse|float|2400|1024|1|128|1200.0000000000|1200.0000000000|1200.0000000000|2401.0000000000|2.0309998989|0.2966570258|37.9720993042|314572800|8284.3144531250|
many|out-of-place|R2R inverse|float|2430|1024|1|128|1215.0000000000|1215.0000000000|1215.0000000000|2431.0000000000|1.4470000267|0.2992343903|38.3020019531|318504960|8315.6220703125|
many|out-of-place|R2R forward|float|2430|1024|1|128|1215.0000000000|1215.0000000000|1215.0000000000|2431.0000000000|3.6159999371|0.2992382646|38.3024978638|318504960|8315.5146484375|
many|out-of-place|R2R forward|float|2430|1008|1|128|1196.0156250000|1196.0156250000|1196.0156250000|2393.0156250000|1.7450000048|0.3164905906|40.5107955933|313528320|7739.3769531250|
many|out-of-place|R2R inverse|float|2430|1008|1|128|1196.0156250000|1196.0156250000|1196.0156250000|2393.0156250000|0.9300000072|0.3170226514|40.5788993835|313528320|7726.3876953125|
many|out-of-place|R2R inverse|float|2400|1008|1|128|1181.2500000000|1181.2500000000|1181.2500000000|2363.4843750000|1.1160000563|0.3199921846|40.9589996338|309657600|7560.1845703125|
many|out-of-place|R2R inverse|float|2450|1008|1|128|1205.8593750000|1205.8593750000|1205.8593750000|2412.7031250000|4.0050001144|0.3233343959|41.3868026733|316108800|7637.9135742188|
many|out-of-place|R2R forward|float|2450|1008|1|128|1205.8593750000|1205.8593750000|1205.8593750000|2412.7031250000|1.5579999685|0.3250047266|41.6006050110|316108800|7598.6591796875|
many|out-of-place|R2R forward|float|2400|1008|1|128|1181.2500000000|1181.2500000000|1181.2500000000|2363.4843750000|1.0190000534|0.3264836073|41.7899017334|309657600|7409.8666992188|

Current code:

$ ./cuFFTAdvisor -find 10 -x 2400 -y 1000 -n 1000
rank|placeness|type|data|X|Y|Z|batch|plan size estimate (MB)|plan size estimate 2 (MB)|plan size actual (MB)|data size (MB)|plan time (ms)|exec time (ms/signal)|exec time of batch (ms)|elements|performance (1k elem of signal/ms)|error message
many|out-of-place|R2R forward|float|2400|1000|1|128|1171.8750000000|1171.8750000000|1171.8750000000|2344.7265625000|1.1849999428|0.2890476584|36.9981002808|307200000|8303.1289062500|
many|out-of-place|R2R inverse|float|2400|1000|1|128|1171.8750000000|1171.8750000000|1171.8750000000|2344.7265625000|1.6330000162|0.2893500030|37.0368003845|307200000|8294.4531250000|
many|out-of-place|R2R forward|float|1000|2401|1|256|0.0000000000|0.0000000000|0.0000000000|4694.1425781250|nan|nan|nan|614656000|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R inverse|float|1000|2401|1|256|0.0000000000|0.0000000000|0.0000000000|4694.1425781250|nan|nan|nan|614656000|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R inverse|float|1008|2401|1|256|0.0000000000|0.0000000000|0.0000000000|4731.6582031250|nan|nan|nan|619573248|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R forward|float|1008|2401|1|256|0.0000000000|0.0000000000|0.0000000000|4731.6582031250|nan|nan|nan|619573248|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R inverse|float|1024|2401|1|256|0.0000000000|0.0000000000|0.0000000000|4806.6894531250|nan|nan|nan|629407744|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R forward|float|1024|2401|1|256|0.0000000000|0.0000000000|0.0000000000|4806.6894531250|nan|nan|nan|629407744|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R forward|float|1000|2401|1|128|0.0000000000|0.0000000000|0.0000000000|2347.0712890625|nan|nan|nan|307328000|nan|Plan estimation probably failed, as the estimated size is 0(zero)
many|out-of-place|R2R inverse|float|1000|2401|1|128|0.0000000000|0.0000000000|0.0000000000|2347.0712890625|nan|nan|nan|307328000|nan|Plan estimation probably failed, as the estimated size is 0(zero)