https://bugs.llvm.org/show_bug.cgi?id=51149
Bug ID: 51149
Summary: Performance regression saw after
https://reviews.llvm.org/rG9c4c2f24725e9f98b96fb360894
276d342c3ba50
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 25039
--> https://bugs.llvm.org/attachment.cgi?id=25039&action=edit
compare.png
We have an internal micro-benchmark seeing 11% performance regression after
https://reviews.llvm.org/rG9c4c2f24725e9f98b96fb360894276d342c3ba50.
We extract a testcase to show the problem:
clang-without-the-patch -fexperimental-new-pass-manager -O3 1.ll -S -o /tmp/1.s
clang-with-the-patch -fexperimental-new-pass-manager -O3 1.ll -S -o /tmp/2.s
1.ll, 1.s and 2.s are attached.
In the compare.png attached, for the same code region, we show there are 13
instructions in the 2.s while there are 10 instructions in the 1.s.
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