[Mlir-commits] [mlir] [math] lower rsqrt to sqrt + fdiv (PR #91344)

[Prashant Kumar]

================
@@ -615,6 +615,24 @@ static LogicalResult convertRoundEvenOp(math::RoundEvenOp op,
   return success();
 }
 
+// Convert `math.rsqrt` into `arith.divf` + `math.sqrt`
+static LogicalResult convertRsqrtOp(math::RsqrtOp op,
+                                    PatternRewriter &rewriter) {
+
+  auto operand = op.getOperand();
+  auto operandTy = operand.getType();
+  auto eTy = getElementTypeOrSelf(operandTy);
+  if (!isa<FloatType>(eTy))
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pashu123 wrote:

I think the expansion will work fine for f16, f32, f64. You can enable them.

https://github.com/llvm/llvm-project/pull/91344