From cfca06d7963fa0909f90483b42a6d7d194d01e08 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sun, 26 Jul 2020 19:36:28 +0000
Subject: Vendor import of llvm-project master 2e10b7a39b9, the last commit
 before the llvmorg-12-init tag, from which release/11.x was branched.

---
 llvm/lib/Target/AMDGPU/AMDGPUGlobalISelUtils.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'llvm/lib/Target/AMDGPU/AMDGPUGlobalISelUtils.cpp')

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUGlobalISelUtils.cpp b/llvm/lib/Target/AMDGPU/AMDGPUGlobalISelUtils.cpp
index 16d7f2c4f9e59..989937a597fb2 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUGlobalISelUtils.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUGlobalISelUtils.cpp
@@ -43,3 +43,12 @@ AMDGPU::getBaseWithConstantOffset(MachineRegisterInfo &MRI, Register Reg) {
 
   return std::make_tuple(Reg, 0, Def);
 }
+
+bool AMDGPU::isLegalVOP3PShuffleMask(ArrayRef<int> Mask) {
+  assert(Mask.size() == 2);
+
+  // If one half is undef, the other is trivially in the same reg.
+  if (Mask[0] == -1 || Mask[1] == -1)
+    return true;
+  return (Mask[0] & 2) == (Mask[1] & 2);
+}
-- 
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