[PATCH] D32814: [GISel]: Add support to translate ConstantVectors

[Aditya Nandakumar via Phabricator via llvm-commits]

aditya_nandakumar updated this revision to Diff 97682.
aditya_nandakumar edited the summary of this revision.
aditya_nandakumar added a comment.

Clang-format


Repository:
  rL LLVM

https://reviews.llvm.org/D32814

Files:
  lib/CodeGen/GlobalISel/IRTranslator.cpp
  test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll


Index: test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
===================================================================
--- test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
+++ test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
@@ -1541,3 +1541,12 @@
   %res = shufflevector <8 x i8> %arg1, <8 x i8> %arg2, <16 x i32> <i32 0, i32 8, i32 1, i32 9, i32 2, i32 10, i32 3, i32 11, i32 4, i32 12, i32 5, i32 13, i32 6, i32 14, i32 7, i32 15>
   ret <16 x i8> %res
 }
+
+; CHECK-LABEL: test_constant_vector
+; CHECK: [[UNDEF:%[0-9]+]](s16) = IMPLICIT_DEF
+; CHECK: [[F:%[0-9]+]](s16) = G_FCONSTANT half 0xH3C00
+; CHECK: [[M:%[0-9]+]](<4 x s16>) = G_MERGE_VALUES [[UNDEF]](s16), [[UNDEF]](s16), [[UNDEF]](s16), [[F]](s16)
+; CHECK: %d0 = COPY [[M]](<4 x s16>)
+define <4 x half> @test_constant_vector() {
+  ret <4 x half> <half undef, half undef, half undef, half 0xH3C00>
+}
Index: lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -1108,6 +1108,14 @@
     default:
       return false;
     }
+  } else if (auto CV = dyn_cast<ConstantVector>(&C)) {
+    if (CV->getNumOperands() == 1)
+      return translate(*CV->getOperand(0), Reg);
+    SmallVector<unsigned, 4> Ops;
+    for (unsigned i = 0; i < CV->getNumOperands(); ++i) {
+      Ops.push_back(getOrCreateVReg(*CV->getOperand(i)));
+    }
+    EntryBuilder.buildMerge(Reg, Ops);
   } else
     return false;
 


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