[llvm] [AArch64] Fix #94909: Optimize vector fmul(sitofp(x), 0.5) -> scvtf(x, 2) (PR #141480)
David Green via llvm-commits
llvm-commits at lists.llvm.org
Sun Jun 29 13:55:40 PDT 2025
================
@@ -3952,6 +3960,125 @@ static bool checkCVTFixedPointOperandWithFBits(SelectionDAG *CurDAG, SDValue N,
return true;
}
+static bool checkCVTFixedPointOperandWithFBitsForVectors(SelectionDAG *CurDAG,
+ SDValue N,
+ SDValue &FixedPos,
+ unsigned FloatWidth,
+ bool IsReciprocal) {
+
+ if (N->getNumOperands() < 1)
+ return false;
+
+ SDValue ImmediateNode = N.getOperand(0);
+ if (N.getOpcode() == ISD::BITCAST || N.getOpcode() == AArch64ISD::NVCAST) {
+ // This could have been a bitcast to a scalar
+ if (!ImmediateNode.getValueType().isVector())
+ return false;
+ }
+
+ if (ImmediateNode.getOpcode() == AArch64ISD::DUP ||
+ ImmediateNode.getOpcode() == AArch64ISD::MOVIshift ||
+ ImmediateNode.getOpcode() == AArch64ISD::FMOV ||
----------------
davemgreen wrote:
I don't think this can be FMOV now.
https://github.com/llvm/llvm-project/pull/141480
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