[llvm] [RISCV][GISel] Lower G_ABDS and G_ABDU (PR #155888)

[Craig Topper via llvm-commits]

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@@ -488,6 +488,11 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST)
       .minScalar(ST.hasStdExtZbb(), 0, sXLen)
       .lower();
 
+  getActionDefinitionsBuilder({G_ABDS, G_ABDU})
+      .legalFor(ST.hasStdExtZbb(), {sXLen})
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topperc wrote:

How can it be legal for Zbb? We don't have an instruction for it.

https://github.com/llvm/llvm-project/pull/155888