[llvm-bugs] [Bug 41601] New: load+zext from a known size source should be wider load+mask

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41601

            Bug ID: 41601
           Summary: load+zext from a known size source should be wider
                    load+mask
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Keywords: code-quality
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: nok.raven at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

The information about load source should be used to produce load+mask where
currently concatenated loads produced, for example a known size array:

#include <cstring>
#include <cstdint>
#include <cstddef>

std::uint32_t loadu24(std::byte const(&src)[10])
{
  std::uint32_t result = 0;
  std::memcpy(&result, src, 3);
  return result;
}

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