[InterleavedAccessPass] Get round the unsupported large scalarize vectors (#88643)

When build with option -msve-vector-bits=512, the return vaule of
Subtarget->getMinSVEVectorSizeInBits() is 512;
While the MinElts is still 4 for <vscale x 4 x double> in
getNumInterleavedAccesses, so it creates invalid
llvm.aarch64.sve.ld2.sret.nxv4f64, which need be splited.
Unlikely, the related custom spilting is not supported now.

Fix #88247

Author: vfdff

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -15888,7 +15888,7 @@ unsigned AArch64TargetLowering::getNumInterleavedAccesses(
   unsigned VecSize = 128;
   unsigned ElSize = DL.getTypeSizeInBits(VecTy->getElementType());
   unsigned MinElts = VecTy->getElementCount().getKnownMinValue();
-  if (UseScalable)
+  if (UseScalable && isa<FixedVectorType>(VecTy))
     VecSize = std::max(Subtarget->getMinSVEVectorSizeInBits(), 128u);
   return std::max<unsigned>(1, (MinElts * ElSize + 127) / VecSize);
 }

llvm/test/Transforms/InterleavedAccess/AArch64/sve-interleaved-accesses.ll

@@ -491,6 +491,30 @@ define void @store_bfloat_factor2(ptr %ptr, <16 x bfloat> %v0, <16 x bfloat> %v1
   ret void
 }
 
+; Ensure vscale_range property does not affect scalable vector types.
+define { <vscale x 4 x double>, <vscale x 4 x double> } @deinterleave_nxptr_factor2(ptr %ptr) #2 {
+; CHECK-LABEL: define { <vscale x 4 x double>, <vscale x 4 x double> } @deinterleave_nxptr_factor2(
+; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr <vscale x 2 x double>, ptr [[PTR]], i64 0
+; CHECK-NEXT:    [[LDN1:%.*]] = call { <vscale x 2 x double>, <vscale x 2 x double> } @llvm.aarch64.sve.ld2.sret.nxv2f64(<vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), ptr [[TMP1]])
+; CHECK-NEXT:    [[TMP2:%.*]] = extractvalue { <vscale x 2 x double>, <vscale x 2 x double> } [[LDN1]], 0
+; CHECK-NEXT:    [[TMP3:%.*]] = call <vscale x 4 x double> @llvm.vector.insert.nxv4f64.nxv2f64(<vscale x 4 x double> poison, <vscale x 2 x double> [[TMP2]], i64 0)
+; CHECK-NEXT:    [[TMP4:%.*]] = extractvalue { <vscale x 2 x double>, <vscale x 2 x double> } [[LDN1]], 1
+; CHECK-NEXT:    [[TMP5:%.*]] = call <vscale x 4 x double> @llvm.vector.insert.nxv4f64.nxv2f64(<vscale x 4 x double> poison, <vscale x 2 x double> [[TMP4]], i64 0)
+; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr <vscale x 2 x double>, ptr [[PTR]], i64 2
+; CHECK-NEXT:    [[LDN2:%.*]] = call { <vscale x 2 x double>, <vscale x 2 x double> } @llvm.aarch64.sve.ld2.sret.nxv2f64(<vscale x 2 x i1> shufflevector (<vscale x 2 x i1> insertelement (<vscale x 2 x i1> poison, i1 true, i64 0), <vscale x 2 x i1> poison, <vscale x 2 x i32> zeroinitializer), ptr [[TMP6]])
+; CHECK-NEXT:    [[TMP7:%.*]] = extractvalue { <vscale x 2 x double>, <vscale x 2 x double> } [[LDN2]], 0
+; CHECK-NEXT:    [[TMP8:%.*]] = call <vscale x 4 x double> @llvm.vector.insert.nxv4f64.nxv2f64(<vscale x 4 x double> [[TMP3]], <vscale x 2 x double> [[TMP7]], i64 2)
+; CHECK-NEXT:    [[TMP9:%.*]] = extractvalue { <vscale x 2 x double>, <vscale x 2 x double> } [[LDN2]], 1
+; CHECK-NEXT:    [[TMP10:%.*]] = call <vscale x 4 x double> @llvm.vector.insert.nxv4f64.nxv2f64(<vscale x 4 x double> [[TMP5]], <vscale x 2 x double> [[TMP9]], i64 2)
+; CHECK-NEXT:    [[TMP11:%.*]] = insertvalue { <vscale x 4 x double>, <vscale x 4 x double> } poison, <vscale x 4 x double> [[TMP8]], 0
+; CHECK-NEXT:    [[TMP12:%.*]] = insertvalue { <vscale x 4 x double>, <vscale x 4 x double> } [[TMP11]], <vscale x 4 x double> [[TMP10]], 1
+; CHECK-NEXT:    ret { <vscale x 4 x double>, <vscale x 4 x double> } [[TMP12]]
+;
+  %wide.vec = load <vscale x 8 x double>, ptr %ptr, align 8
+  %ldN = tail call { <vscale x 4 x double>, <vscale x 4 x double> } @llvm.experimental.vector.deinterleave2.nxv8f64(<vscale x 8 x double> %wide.vec)
+  ret { <vscale x 4 x double>, <vscale x 4 x double> } %ldN
+}
+
 attributes #0 = { vscale_range(2,2) "target-features"="+sve" }
 attributes #1 = { vscale_range(2,4) "target-features"="+sve" }
 attributes #2 = { vscale_range(4,4) "target-features"="+sve" }