[llvm-bugs] [Bug 42040] New: PowerPC/AltiVec: does not use xxswapd/xxpermdi on -mcpu=power9

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42040

            Bug ID: 42040
           Summary: PowerPC/AltiVec: does not use xxswapd/xxpermdi on
                    -mcpu=power9
           Product: new-bugs
           Version: trunk
          Hardware: Macintosh
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: slandden at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

This code should use xxswapd

https://godbolt.org/z/QWkmnX

#include <altivec.h>

struct ret {
  unsigned long int xl;
  unsigned long int xh;
};

struct ret foo (vector double v)
{
  union float_t {
    unsigned long int x;
    double d;
  };

  return (struct ret) { (union float_t) { .d = v[1] }.x,
                        (union float_t) { .d = v[0] }.x };
}

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