[llvm] [RISCV] Pass sign-extended value to isInt check in expandMul (PR #150211)

[Craig Topper via llvm-commits]

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@@ -463,3 +463,27 @@ entry:
   %add = add nsw i32 %shlc1, %shlc2
   ret i32 %add
 }
+
+define i32 @testmuliaddnegimm(i32 %a, i32 %b) {
+; RV32IM-LABEL: testmuliaddnegimm:
+; RV32IM:       # %bb.0:
+; RV32IM-NEXT:    slli a1, a0, 1
+; RV32IM-NEXT:    add a0, a1, a0
+; RV32IM-NEXT:    li a1, 3
+; RV32IM-NEXT:    sub a0, a1, a0
+; RV32IM-NEXT:    ret
+;
+; RV32IMXQCIAC-LABEL: testmuliaddnegimm:
+; RV32IMXQCIAC:       # %bb.0:
+; RV32IMXQCIAC-NEXT:    li a1, 3
+; RV32IMXQCIAC-NEXT:    qc.muliadd a1, a0, -3
+; RV32IMXQCIAC-NEXT:    mv a0, a1
+; RV32IMXQCIAC-NEXT:    ret
+;
+; RV32IZBAMXQCIAC-LABEL: testmuliaddnegimm:
+; RV32IZBAMXQCIAC:       # %bb.0:
+; RV32IZBAMXQCIAC-NEXT:    ret
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topperc wrote:

I'm concerned that this generated no code. That looks like a bug elsewhere.

https://github.com/llvm/llvm-project/pull/150211