[llvm] r235718 - [mips][FastISel] Specify which types we handle for integer extension.

[Vasileios Kalintiris]

Author: vkalintiris
Date: Fri Apr 24 08:48:19 2015
New Revision: 235718

URL: http://llvm.org/viewvc/llvm-project?rev=235718&view=rev
Log:
[mips][FastISel] Specify which types we handle for integer extension.

Summary:
Perform integer extension only when the destination type is one of
i8, i16 & i32 and when the source type is i1, i8 or i16. For other
combinations we fall back to SelectionDAG.

This fixes the test MultiSource/Benchmarks/7zip that was failing in our
out-of-tree MIPS buildbots.

Reviewers: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9243

Modified:
    llvm/trunk/lib/Target/Mips/MipsFastISel.cpp

Modified: llvm/trunk/lib/Target/Mips/MipsFastISel.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsFastISel.cpp?rev=235718&r1=235717&r2=235718&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Mips/MipsFastISel.cpp (original)
+++ llvm/trunk/lib/Target/Mips/MipsFastISel.cpp Fri Apr 24 08:48:19 2015
@@ -1394,6 +1394,13 @@ bool MipsFastISel::emitIntZExt(MVT SrcVT
 
 bool MipsFastISel::emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
                               unsigned DestReg, bool IsZExt) {
+  // FastISel does not have plumbing to deal with extensions where the SrcVT or
+  // DestVT are odd things, so test to make sure that they are both types we can
+  // handle (i1/i8/i16/i32 for SrcVT and i8/i16/i32/i64 for DestVT), otherwise
+  // bail out to SelectionDAG.
+  if (((DestVT != MVT::i8) && (DestVT != MVT::i16) && (DestVT != MVT::i32)) ||
+      ((SrcVT != MVT::i1) && (SrcVT != MVT::i8) && (SrcVT != MVT::i16)))
+    return false;
   if (IsZExt)
     return emitIntZExt(SrcVT, SrcReg, DestVT, DestReg);
   return emitIntSExt(SrcVT, SrcReg, DestVT, DestReg);