[PATCH] D146787: [X86] Teach computeKnownBitsForTargetNode about MUL_IMM

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


================
Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:38108
+    // Compute the known zero bits if we don't have to worry about overflow.
+    if (Imm.getActiveBits() + Val.getActiveBits() <= BitWidth) {
+      Val *= Imm;
----------------
Why can't we use KnownBits.mul?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D146787/new/

https://reviews.llvm.org/D146787