[GISel]: Fix generation of illegal COPYs during CallLowering

We end up creating COPY's that are either truncating/extending and this
should be illegal.

https://reviews.llvm.org/D37640

Patch for X86 and ARM by igorb, rovka

llvm-svn: 315240

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
index be0c5c2bb70..93db334f454 100644
--- a/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
@@ -160,10 +160,11 @@ unsigned CallLowering::ValueHandler::extendRegister(unsigned ValReg,
     // FIXME: bitconverting between vector types may or may not be a
     // nop in big-endian situations.
     return ValReg;
-  case CCValAssign::AExt:
+  case CCValAssign::AExt: {
     assert(!VA.getLocVT().isVector() && "unexpected vector extend");
-    // Otherwise, it's a nop.
-    return ValReg;
+    auto MIB = MIRBuilder.buildAnyExt(LocTy, ValReg);
+    return MIB->getOperand(0).getReg();
+  }
   case CCValAssign::SExt: {
     unsigned NewReg = MRI.createGenericVirtualRegister(LocTy);
     MIRBuilder.buildSExt(NewReg, ValReg);