[llvm] [RISCV] Lower (select c, y, 0) -> (qc.muliadd c, y-1) (PR #190323)

[Craig Topper via llvm-commits]

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@@ -99,6 +105,8 @@ def uimm10 : RISCVUImmLeafOp<10>;
 
 def uimm11 : RISCVUImmLeafOp<11>;
 
+def timm12 : TImmLeaf<XLenVT, [{return isInt<12>(Imm);}]>;
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topperc wrote:

You should be able to use `timm`. Since the constant is already correct by construction we don't need to range check it in isel.

https://github.com/llvm/llvm-project/pull/190323