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3 Commits

Author SHA1 Message Date
Jinsong Ji
84a2c78082 [PowerPC][NFC] Update testcase to avoid dead code 
The original testcase might be optimized out due to dead code,
update the testcase to avoid it.

llvm-svn: 365810
 2019-07-11 19:16:33 +00:00
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
Jinsong Ji
bc7fc3ecb6 [PowerPC][NFC]Add a test for MachinePipeliner bug 
llvm-svn: 364350
 2019-06-25 20:56:17 +00:00