[AArch64] Fix assert AArch64TargetLowering::ReplaceNodeResults

Don't know how to custom expand this
UNREACHABLE executed at llvm-project/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp:16788

The fix is to provide missing expansions for:
  case ISD::STRICT_FP_TO_UINT:
  case ISD::STRICT_FP_TO_SINT:

A test case is provided.

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D107452

Author: simonwallis2

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -17320,6 +17320,8 @@ void AArch64TargetLowering::ReplaceNodeResults(
     return;
   case ISD::FP_TO_UINT:
   case ISD::FP_TO_SINT:
+  case ISD::STRICT_FP_TO_SINT:
+  case ISD::STRICT_FP_TO_UINT:
     assert(N->getValueType(0) == MVT::i128 && "unexpected illegal conversion");
     // Let normal code take care of it by not adding anything to Results.
     return;

llvm/test/CodeGen/AArch64/fptosi-strictfp.ll

@@ -0,0 +1,23 @@
+; RUN: llc < %s | FileCheck %s
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-arm-none-eabi"
+
+define i128 @test_fixtfti(fp128 %ld) {
+; CHECK-LABEL: test_fixtfti:
+; CHECK: bl	__fixtfti
+entry:
+  %conv = call i128 @llvm.experimental.constrained.fptosi.i128.f128(fp128 %ld, metadata !"fpexcept.strict")
+  ret i128 %conv
+}
+
+declare i128 @llvm.experimental.constrained.fptosi.i128.f128(fp128, metadata)
+
+define i128 @test_fixtftu(fp128 %ld) {
+; CHECK-LABEL: test_fixtftu:
+; CHECK: bl	__fixunstfti
+entry:
+  %conv = call i128 @llvm.experimental.constrained.fptoui.i128.f128(fp128 %ld, metadata !"fpexcept.strict")
+  ret i128 %conv
+}
+
+declare i128 @llvm.experimental.constrained.fptoui.i128.f128(fp128, metadata)