[AArch64][SME]: Add precursory tests for D138281

Author: hassnaaHamdi

llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-fp-convert.ll

@@ -0,0 +1,23 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -force-streaming-compatible-sve < %s | FileCheck %s
+
+target triple = "aarch64-unknown-linux-gnu"
+
+; Ensure we don't crash when trying to combine fp<->int conversions
+define void @fp_convert_combine_crash(<8 x float> *%a, <8 x i32> *%b) #0 {
+; CHECK-LABEL: fp_convert_combine_crash:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    ldp q0, q1, [x0]
+; CHECK-NEXT:    fcvtzs v0.4s, v0.4s, #3
+; CHECK-NEXT:    fcvtzs v1.4s, v1.4s, #3
+; CHECK-NEXT:    stp q0, q1, [x1]
+; CHECK-NEXT:    ret
+  %f = load <8 x float>, <8 x float>* %a
+  %mul.i = fmul <8 x float> %f, <float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00,
+                                 float 8.000000e+00, float 8.000000e+00, float 8.000000e+00, float 8.000000e+00>
+  %vcvt.i = fptosi <8 x float> %mul.i to <8 x i32>
+  store <8 x i32> %vcvt.i, <8 x i32>* %b
+  ret void
+}
+
+attributes #0 = { "target-features"="+sve" }