[llvm-bugs] [Bug 45418] New: Regression(https://reviews.llvm.org/D74976): up to 11% slower pdf rendering due to codegen changes

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45418

            Bug ID: 45418
           Summary: Regression(https://reviews.llvm.org/D74976): up to 11%
                    slower pdf rendering due to codegen changes
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

We got a report that this slows down PDF rendering in pdfium rendering of one
pdf by 11%, and it slowed down rendering of 6% of pdfs of a test corpus by 2+%.

We bisected it down to https://reviews.llvm.org/D74976

https://bugs.chromium.org/p/chromium/issues/detail?id=1067111#c9 has
before/after assembly of a hot function.

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