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T783 regresses severely in allocations with new pattern match checker

The new pattern match checker (Phab:D1535) allocates 115% more than the previous checker on the T783 testcase,

bytes allocated value is too high:
    Expected    T783(normal) bytes allocated:  526230456 +/-10%
    Lower bound T783(normal) bytes allocated:  473607410 
    Upper bound T783(normal) bytes allocated:  578853502 
    Actual      T783(normal) bytes allocated: 1134085384 
    Deviation   T783(normal) bytes allocated:      115.5 %
*** unexpected stat test failure for T783(normal)

I suspect this isn't avoidable as this testcase consists of nothing more than 500 guarded equations, so exercises the checker quite thoroughly. That being said, perhaps it's worth a closer look.

Trac metadata
Trac field Value
Version 7.10.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC gkaracha
Operating system
Architecture
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