[PATCH] D49483: [AMDGPU] Optimize _L image intrinsic to _LZ when lod is zero

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


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Comment at: lib/Target/AMDGPU/SIISelLowering.cpp:4588
+    if (auto ConstantLod = dyn_cast<ConstantFPSDNode>(VAddrs[NumVAddrs-1].getNode())) {
+      if (ConstantLod->isZero()) {
+        IntrOpcode = LZMappingInfo->LZ;  // set new opcode to _lz variant of _l
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Does this need to check that it is positive zero?


Repository:
  rL LLVM

https://reviews.llvm.org/D49483