[llvm] [RISCV] Implement RISCVISD::SHL_ADD and move patterns into combine (PR #89263)

[Philip Reames via llvm-commits]

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@@ -581,30 +583,6 @@ def : Pat<(mul (XLenVT GPR:$r), C9LeftShift:$i),
           (SLLI (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)),
                 (TrailingZeros C9LeftShift:$i))>;
 
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 11)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 2)), 1)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 19)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), 1)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 13)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 1)), 2)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 21)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 2)), 2)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 37)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), 2)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 25)),
-          (TH_ADDSL (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 2)),
-                    (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 2)), 2)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 41)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 2)), 3)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 73)),
-          (TH_ADDSL GPR:$r, (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), 3)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 27)),
-          (TH_ADDSL (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), 1)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 45)),
-          (TH_ADDSL (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), (XLenVT (TH_ADDSL GPR:$r, GPR:$r, 3)), 2)>;
-def : Pat<(mul_const_oneuse GPR:$r, (XLenVT 81)),
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preames wrote:

No.  The switch has "case 91:" which appears to have been a typo.  

https://github.com/llvm/llvm-project/pull/89263