[LLVMbugs] [Bug 20035] New: Recognize horizontal add patterns.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20035

            Bug ID: 20035
           Summary: Recognize horizontal add patterns.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: grosbach at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

#include <arm_neon.h>
unsigned hadd(uint32x4_t a) {
  return a[0] + a[1] + a[2] + a[3];
}

Should generate ADDV.4S. Instead we get scalarized code.

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