Jinsong Ji fee855b5bc [MachinePipeliner] Fix risky iterator usage R++, --R ...

When we calculate MII, we use two loops, one with iterator R++ to
check whether we can reserve the resource, then --R to move back
the iterator to do reservation.

This is risky, as R++, --R may not point to the same element at all.
The can cause wrong MII.

Differential Revision: https://reviews.llvm.org/D63536

llvm-svn: 364353

2019-06-25 21:50:56 +00:00

151 KiB

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