[all-commits] [llvm/llvm-project] 59c3fe: [PowerPC] Exploit xxeval instruction for ternary p...

[Tony Varghese via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 59c3fe65054fd3fb9be62ef326d1540cc375e913
      https://github.com/llvm/llvm-project/commit/59c3fe65054fd3fb9be62ef326d1540cc375e913
  Author: Tony Varghese <tonypalampalliyil at gmail.com>
  Date:   2025-07-29 (Tue, 29 Jul 2025)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCInstrP10.td
    M llvm/test/CodeGen/PowerPC/xxeval-vselect-x-and.ll

  Log Message:
  -----------
  [PowerPC] Exploit xxeval instruction for ternary patterns - ternary(A, X, and(B,C)) (#141733)

## Description
<!--- Title/Description will be Subject/Body of commit message.      -->
<!--- Please be concise and limit the subject line to 50 characters, -->
<!--- and wrap the Description at 72 characters.                     -->
<!--- Describe why this is required, what problem it solves.         -->
Adds support for ternary equivalent operations of the form `ternary(A,
X, and(B,C))` where `X=[xor(B,C)| nor(B,C)| eqv(B,C)| not(B)| not(C)]`.

List of `xxeval` equivalent ternary operations added and the
corresponding `imm` value required:

Ternary Operator| Imm Value
--|--
ternary(A,  xor(B,C), and(B,C))	| 22
ternary(A,  nor(B,C), and(B,C))	| 24
ternary(A,  eqv(B,C), and(B,C))	| 25
ternary(A,  not(C), and(B,C))	| 26
ternary(A,  not(B), and(B,C))	| 28

eg.  `xxeval XT,XA,XB,XC,22` 
- performs `XA ? xor(XB, XC) : and(XB,XC)`and places the result in `XT`.

Co-authored-by: Tony Varghese <tony.varghese at ibm.com>



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications