[llvm] [CodeGen] Add generic INIT_UNDEF pseudo (PR #106744)

Nikita Popov via llvm-commits llvm-commits at lists.llvm.org
Mon Sep 2 08:08:47 PDT 2024


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@@ -1254,6 +1254,13 @@ def IMPLICIT_DEF : StandardPseudoInstruction {
   let isAsCheapAsAMove = true;
   let isMeta = true;
 }
+def INIT_UNDEF : StandardPseudoInstruction {
+  let OutOperandList = (outs unknown:$dst);
+  let InOperandList = (ins);
+  let AsmString = "";
+  let hasSideEffects = false;
+  let Size = 0;
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nikic wrote:

For the record, I tried reusing IMPLICIT_DEF but based on the resulting RISCV test diffs at least that doesn't work (I saw some `vrgather.vi` with equal registers with that change).

https://github.com/llvm/llvm-project/pull/106744


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