[AArch64][RegisterBankInfo] Add mapping support for G_BITCAST of s128

Anything bigger than 64-bit just map to FPR.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315946 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 27 insertions, 0 deletions

diff --git a/test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir b/test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir
index 296f65c041a..1d4781a9d98 100644
--- a/test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir
+++ b/test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir
@@ -66,6 +66,7 @@
   define void @bitcast_s64_fpr() { ret void }
   define void @bitcast_s64_gpr_fpr() { ret void }
   define void @bitcast_s64_fpr_gpr() { ret void }
+  define void @bitcast_s128() { ret void }
 
   define i64 @greedyWithChainOfComputation(i64 %arg1, <2 x i32>* %addr) {
     %varg1 = bitcast i64 %arg1 to <2 x i32>
@@ -616,6 +617,32 @@ body:             |
 ...
 
 ---
+# CHECK-LABEL: name: bitcast_s128
+name:            bitcast_s128
+legalized: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _}
+  - { id: 1, class: _}
+  - { id: 2, class: _}
+  - { id: 3, class: _}
+# CHECK: registers:
+# CHECK:  - { id: 2, class: fpr, preferred-register: '' }
+# CHECK:  - { id: 3, class: fpr, preferred-register: '' }
+# CHECK: %2(<2 x s64>) = G_BITCAST %3(s128)
+body:             |
+  bb.1:
+    liveins: %x0, %x1
+    %0(s64) = COPY %x0
+    %1(s64) = COPY %x1
+    %3(s128) = G_MERGE_VALUES %0(s64), %1(s64)
+    %2(<2 x s64>) = G_BITCAST %3(s128)
+    %q0 = COPY %2(<2 x s64>)
+    RET_ReallyLR implicit %q0
+
+...
+
+---
 # Make sure the greedy mode is able to take advantage of the
 # alternative mappings of G_LOAD to coalesce the whole chain
 # of computation on GPR.