[llvm-bugs] [Bug 27203] New: [ppc] hoist repeated constant for better code size and speed

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27203

            Bug ID: 27203
           Summary: [ppc] hoist repeated constant for better code size and
                    speed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: spatel+llvm at rotateright.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Filing a sentimental PPC sibling report for bug 27202:

define i1 @foo(i32 %i) {
  %and = and i32 %i, 305419896
  %cmp = icmp eq i32 %and, 305419896
  ret i1 %cmp
}

$ ./llc maskcmp.ll -mtriple=powerpc64 -o - 
...
    lis 4, 4660
    ori 4, 4, 22136
    and 3, 3, 4
    xoris 3, 3, 4660     <--- why bother?
    cmplwi     3, 22136    <--- use cmplw instead
    li 3, 1
    bclr 12, 2, 0
# BB#1:
    li 3, 0
    blr

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