[llvm-bugs] [Bug 49189] New: update_llc_test_checks.py doesn't report when a common prefix has been lost

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49189

            Bug ID: 49189
           Summary: update_llc_test_checks.py doesn't report when a common
                    prefix has been lost
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: support scripts
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: greg.bedwell at sony.com, i at maskray.me,
                    llvm-bugs at lists.llvm.org

https://reviews.llvm.org/rGf32dc6bb42fd24517289fd1e3418994daa4fec20

; RUN: llc < %s -mtriple=x86_64-- -mattr=+avx2 | FileCheck %s
--check-prefixes=AVX,AVX2
; RUN: llc < %s -mtriple=x86_64-- -mattr=+avx2,+fast-variable-shuffle |
FileCheck %s --check-prefixes=AVX,AVX2

update_llc_test_checks.py didn't report that two AVX2 runs had conflicting
checks for all their common prefixes, which meant we lost ALL test coverage.

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