diff options
| author | Arthur Eubanks <aeubanks@google.com> | 2020-10-27 15:47:59 -0700 |
|---|---|---|
| committer | Arthur Eubanks <aeubanks@google.com> | 2020-10-28 12:56:23 -0700 |
| commit | 3b2256a41b062ff5e9dcf52a99b945cadf2388d1 (patch) | |
| tree | 739c014478303f7beb289223232bb21004b33ca4 /llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | |
| parent | 0661328d7efb81a8ac7f2ca0734a65f9be105f29 (diff) | |
| download | llvm-3b2256a41b062ff5e9dcf52a99b945cadf2388d1.zip llvm-3b2256a41b062ff5e9dcf52a99b945cadf2388d1.tar.gz llvm-3b2256a41b062ff5e9dcf52a99b945cadf2388d1.tar.bz2 | |
[test] Make bt_order_by_weight in switch.ll more robust
Branch weights are not represented internally linearly with the value in
the IR. In its current state the test happened to pass, but the branch
weights for 0,3,6 and 2,5,8,9 were not actually equal.
$ opt -passes='print<branch-prob>'
shows that the sum of the branch probabilities going to bb0 and bb2 were not the same.
Printing analysis results of BPI for function 'bt_order_by_weight':
---- Branch Probabilities ----
edge entry -> bb0 probability is 0x00000003 / 0x80000000 = 0.00%
edge entry -> bb2 probability is 0x00000004 / 0x80000000 = 0.00%
with this change:
Printing analysis results of BPI for function 'bt_order_by_weight':
---- Branch Probabilities ----
edge entry -> bb0 probability is 0x00000004 / 0x80000000 = 0.00%
edge entry -> bb2 probability is 0x00000004 / 0x80000000 = 0.00%
Reviewed By: hans
Differential Revision: https://reviews.llvm.org/D90273
Diffstat (limited to 'llvm/lib/Bitcode/Writer/BitcodeWriter.cpp')
0 files changed, 0 insertions, 0 deletions