[X86] Add ANY_EXTEND to switch in ReplaceNodeResults, but just fall back to default handling.

ANY_EXTEND of v8i8 is marked Custom on AVX512 for handling extends
from v8i8. But the type legalization infrastructure will call
ReplaceNodeResults for v8i8 results. We should just defer it the
default handling instead of asserting in the default of the switch.

Fixes PR43509.

llvm-svn: 373234

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 089c7ebb19a..18a998dba38 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -27887,6 +27887,12 @@ void X86TargetLowering::ReplaceNodeResults(SDNode *N,
     }
     return;
   }
+  case ISD::ANY_EXTEND:
+    // Right now, only MVT::v8i8 has Custom action for an illegal type.
+    // It's intended to custom handle the input type.
+    assert(N->getValueType(0) == MVT::v8i8 &&
+           "Do not know how to legalize this Node");
+    return;
   case ISD::SIGN_EXTEND:
   case ISD::ZERO_EXTEND: {
     EVT VT = N->getValueType(0);