[PATCH] D93963: [GlobalISel][AMDGPU] Lower G_UMULO/G_SMULO

[Jay Foad via Phabricator via llvm-commits]

foad added inline comments.


================
Comment at: llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp:1891
+  unsigned SrcBitWidth = SrcTy.getScalarSizeInBits();
+  MachineInstrBuilder LeftOperand, RightOperand;
+
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foad wrote:
> Maybe assert that WideTy is at least twice as wide as SrcTy, otherwise the trick we use for calculating overflow below does not work.
Did you test with assertions enabled? I think this needs to be `>=`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D93963/new/

https://reviews.llvm.org/D93963