[PATCH] D137547: [AArch64][SVE] Use PTRUE instruction for get_active_lane_mask intrinsic if the range is appropriate for predicator constant

[Dinar Temirbulatov via Phabricator via llvm-commits]

dtemirbulatov updated this revision to Diff 475805.
dtemirbulatov added a comment.

Add support for any range not just from 0.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137547/new/

https://reviews.llvm.org/D137547

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/active_lane_mask.ll


Index: llvm/test/CodeGen/AArch64/active_lane_mask.ll
===================================================================
--- llvm/test/CodeGen/AArch64/active_lane_mask.ll
+++ llvm/test/CodeGen/AArch64/active_lane_mask.ll
@@ -475,6 +475,38 @@
   ret <2 x i1> %active.lane.mask
 }
 
+define <vscale x 4 x i1> @lane_mask_nxv4i1_imm3() {
+; CHECK-LABEL: lane_mask_nxv4i1_imm3:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    ptrue p0.s, vl3
+; CHECK-NEXT:    ret
+entry:
+  %active.lane.mask = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 0, i64 3)
+  ret <vscale x 4 x i1> %active.lane.mask
+}
+
+define <vscale x 4 x i1> @lane_mask_nxv4i1_imm4() {
+; CHECK-LABEL: lane_mask_nxv4i1_imm4:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    mov w8, #4
+; CHECK-NEXT:    whilelo p0.s, xzr, x8
+; CHECK-NEXT:    ret
+entry:
+  %active.lane.mask = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 0, i64 4)
+  ret <vscale x 4 x i1> %active.lane.mask
+}
+
+define <vscale x 16 x i1> @lane_mask_nxv16i1_imm10() {
+; CHECK-LABEL: lane_mask_nxv16i1_imm10:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    mov w8, #10
+; CHECK-NEXT:    whilelo p0.b, xzr, x8
+; CHECK-NEXT:    ret
+entry:
+  %active.lane.mask = call <vscale x 16 x i1> @llvm.get.active.lane.mask.nxv16i1.i64(i64 0, i64 10)
+  ret <vscale x 16 x i1> %active.lane.mask
+}
+
 
 declare <vscale x 32 x i1> @llvm.get.active.lane.mask.nxv32i1.i32(i32, i32)
 declare <vscale x 16 x i1> @llvm.get.active.lane.mask.nxv16i1.i32(i32, i32)
Index: llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
===================================================================
--- llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -4748,6 +4748,21 @@
                                                  Op.getOperand(1))));
     return SDValue();
   }
+  case Intrinsic::aarch64_sve_whilelo: {
+    if (isa<ConstantSDNode>(Op.getOperand(1)) &&
+        isa<ConstantSDNode>(Op.getOperand(2))) {
+      int64_t MinSVEVectorSize = Subtarget->getMinSVEVectorSizeInBits()
+                                     ? Subtarget->getMinSVEVectorSizeInBits()
+                                     : 128;
+      unsigned ElementSize = 128 / Op.getValueType().getVectorMinNumElements();
+      unsigned Dist = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue() -
+                      cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
+      if (getSVEPredPatternFromNumElements(Dist) != None &&
+          Dist < (MinSVEVectorSize / ElementSize))
+        return getPTrue(DAG, dl, Op.getValueType(), Dist);
+    }
+    return SDValue();
+  }
   case Intrinsic::aarch64_sve_sunpkhi:
     return DAG.getNode(AArch64ISD::SUNPKHI, dl, Op.getValueType(),
                        Op.getOperand(1));


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