From ac8ec29c42d4e4c8cc82e9f71ffa16e53197fc84 Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Thu, 5 Oct 2017 00:13:20 +0000
Subject: [PATCH] AMDGPU: Add comment about clamps

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314952 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/AMDGPU/SIFoldOperands.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Target/AMDGPU/SIFoldOperands.cpp b/lib/Target/AMDGPU/SIFoldOperands.cpp
index a527afb25da..a7a12cd1015 100644
--- a/lib/Target/AMDGPU/SIFoldOperands.cpp
+++ b/lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -723,6 +723,8 @@ void SIFoldOperands::foldInstOperand(MachineInstr &MI,
   }
 }
 
+// Clamp patterns are canonically selected to v_max_* instructions, so only
+// handle them.
 const MachineOperand *SIFoldOperands::isClamp(const MachineInstr &MI) const {
   unsigned Op = MI.getOpcode();
   switch (Op) {
-- 
2.40.0