https://bugs.llvm.org/show_bug.cgi?id=45263
Bug ID: 45263
Summary: performance regression caused by
e6a7e3b5e3e779a3bfb617c8d9ed4302edab2cef
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: release blocker
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: w...@google.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
We found the commit below causing 10% performance regression in one of our
benchmark:
https://github.com/llvm/llvm-project/commit/e6a7e3b5e3e779a3bfb617c8d9ed4302edab2cef
I extracted a testcase 1.cc and attached it.
clang.1 -O3 -fexperimental-new-pass-manager -std=gnu++17 -msse4.1 1.cc -S -o
1.s
clang.2 -O3 -fexperimental-new-pass-manager -std=gnu++17 -msse4.1 1.cc -S -o
2.s
clang.1 was built at the version just before
e6a7e3b5e3e779a3bfb617c8d9ed4302edab2cef. clang.2 was built at
e6a7e3b5e3e779a3bfb617c8d9ed4302edab2cef. Searching the loop "This Inner Loop
Header: Depth=2". 1.s has 65 instructions in the loop. 2.s has 72 instructions.
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