[PATCH] D157416: [RISCV][GlobalISel] Legalize multiplication

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


================
Comment at: llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp:112
+
+    getActionDefinitionsBuilder({G_SMULH, G_UMULH}).legalFor({XLenLLT}).lower();
+  } else {
----------------
craig.topper wrote:
> Why do we need .lower() on this? We have instructions for G_SMULH and G_UMULH.
I would assume you want some clamping before going direct to lower (although I wouldn't be surprised if there wasn't complete support for mulh lowering)


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  https://reviews.llvm.org/D157416/new/

https://reviews.llvm.org/D157416