[PATCH] D120462: [AArch64InstrInfo.td] - Lowering fix for cttz intrinsic

[Shubham Narlawar via Phabricator via llvm-commits]

gsocshubham created this revision.
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This patch is a separate patch for lowering fix as mentioned in - https://reviews.llvm.org/D119010

TODO - Create this patch on top of https://reviews.llvm.org/D113291 (as a child of the D113291 <https://reviews.llvm.org/D113291>).

TODO - Add unit test


https://reviews.llvm.org/D120462

Files:
  llvm/lib/Target/AArch64/AArch64InstrInfo.td


Index: llvm/lib/Target/AArch64/AArch64InstrInfo.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64InstrInfo.td
+++ llvm/lib/Target/AArch64/AArch64InstrInfo.td
@@ -2050,9 +2050,9 @@
 def  REV16Xr : OneXRegData<0b001, "rev16", null_frag>;

 def : Pat<(cttz GPR32:$Rn),
-          (CLZWr (RBITWr GPR32:$Rn))>;
+          (ANDWri (CLZWr (RBITWr GPR32:$Rn)), (i32 4))>;
 def : Pat<(cttz GPR64:$Rn),
-          (CLZXr (RBITXr GPR64:$Rn))>;
+          (ANDXri (CLZXr (RBITXr GPR64:$Rn)), (i64 5))>;
 def : Pat<(ctlz (or (shl (xor (sra GPR32:$Rn, (i64 31)), GPR32:$Rn), (i64 1)),
                 (i32 1))),
           (CLSWr GPR32:$Rn)>;


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