[GlobalISel][AArch64] Select llvm.bswap* for non-vector types

This teaches the IRTranslator to emit G_BSWAP when it runs into
Intrinsic::bswap. This allows us to select G_BSWAP for non-vector types in
AArch64.

Add a select-bswap.mir test, and add global isel checks to a couple existing
tests in test/CodeGen/AArch64.

This doesn't handle every bswap case, since some of these rely on known bits
stuff. This just lets us handle the naive case.

Differential Revision: https://reviews.llvm.org/D58081

llvm-svn: 353861

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
index 9b94a9923f0..dd4e0df3188 100644
--- a/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -794,6 +794,8 @@ IRTranslator::getSimpleUnaryIntrinsicOpcode(Intrinsic::ID ID) {
   switch (ID) {
     default:
       break;
+    case Intrinsic::bswap:
+      return TargetOpcode::G_BSWAP;
     case Intrinsic::ceil:
       return TargetOpcode::G_FCEIL;
     case Intrinsic::cos: