[all-commits] [llvm/llvm-project] 310160: [PowerPC] Exploit vabsd on P9

[Esme via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 3101601b54fbb8062c179e804974b9fb4e2b7c19
      https://github.com/llvm/llvm-project/commit/3101601b54fbb8062c179e804974b9fb4e2b7c19
  Author: Li Rong Yi <esme.yi at ibm.com>
  Date:   2020-06-01 (Mon, 01 Jun 2020)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/test/CodeGen/PowerPC/vec_absd.ll

  Log Message:
  -----------
  [PowerPC] Exploit vabsd on P9

Summary: Exploit vabsd* for for absolute difference of vectors on P9,
for example:
void foo (char *restrict p, char *restrict q, char *restrict t)
{
  for (int i = 0; i < 16; i++)
     t[i] = abs (p[i] - q[i]);
}
this case should be matched to the HW instruction vabsdub.

Reviewed By: steven.zhang

Differential Revision: https://reviews.llvm.org/D80271