[AArch64][GlobalISel] Implement selection for G_SHL of <2 x i64>

Simple continuation of existing selection support.

llvm-svn: 372467

Author: aemerson

llvm/lib/Target/AArch64/AArch64InstructionSelector.cpp

@@ -1018,7 +1018,9 @@ bool AArch64InstructionSelector::selectVectorSHL(
     return false;
 
   unsigned Opc = 0;
-  if (Ty == LLT::vector(4, 32)) {
+  if (Ty == LLT::vector(2, 64)) {
+    Opc = AArch64::USHLv2i64;
+  } else if (Ty == LLT::vector(4, 32)) {
     Opc = AArch64::USHLv4i32;
   } else if (Ty == LLT::vector(2, 32)) {
     Opc = AArch64::USHLv2i32;

llvm/test/CodeGen/AArch64/GlobalISel/select-vector-shift.mir

@@ -57,6 +57,35 @@ body:             |
     $q0 = COPY %2(<4 x s32>)
     RET_ReallyLR implicit $q0
 
+...
+---
+name:            shl_v2i64
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: fpr }
+  - { id: 1, class: fpr }
+  - { id: 2, class: fpr }
+machineFunctionInfo: {}
+body:             |
+  bb.1:
+    liveins: $q0, $q1
+
+    ; CHECK-LABEL: name: shl_v2i64
+    ; CHECK: liveins: $q0, $q1
+    ; CHECK: [[COPY:%[0-9]+]]:fpr128 = COPY $q0
+    ; CHECK: [[COPY1:%[0-9]+]]:fpr128 = COPY $q1
+    ; CHECK: [[USHLv2i64_:%[0-9]+]]:fpr128 = USHLv2i64 [[COPY]], [[COPY1]]
+    ; CHECK: $q0 = COPY [[USHLv2i64_]]
+    ; CHECK: RET_ReallyLR implicit $q0
+    %0:fpr(<2 x s64>) = COPY $q0
+    %1:fpr(<2 x s64>) = COPY $q1
+    %2:fpr(<2 x s64>) = G_SHL %0, %1(<2 x s64>)
+    $q0 = COPY %2(<2 x s64>)
+    RET_ReallyLR implicit $q0
+
 ...
 ---
 name:            ashr_v2i32