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[llvm-exegesis] Do not try to assign random registers twice.

Authored by courbet on Oct 29 2020, 3:56 AM.



Doing a random assignment assigns both tested (forward) and back-to-back
(backward) instructions.

When none of the tested instruction and back-to-back instruction have
implicit aliasing, we're currently trying to do a random register
asignment twice.

Fix this (see PR26418).

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courbet created this revision.Oct 29 2020, 3:56 AM
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courbet requested review of this revision.Oct 29 2020, 3:56 AM
gchatelet accepted this revision.Oct 29 2020, 5:22 AM

Good catch! Thx a lot.

This revision is now accepted and ready to land.Oct 29 2020, 5:22 AM
This revision was landed with ongoing or failed builds.Oct 29 2020, 5:27 AM
This revision was automatically updated to reflect the committed changes.