From: Aditya Nandakumar <aditya_nandakumar@apple.com>
Date: Fri, 12 May 2017 22:54:52 +0000 (+0000)
Subject: [GISel]: Add a getConstantFPVRegVal utility
X-Git-Tag: llvmorg-5.0.0-rc1~5171
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2a735421d1aace9d64c4ee7adc1f905974311db3;p=platform%2Fupstream%2Fllvm.git

[GISel]: Add a getConstantFPVRegVal utility

This might be useful across various GISel Passes

https://reviews.llvm.org/D33051

llvm-svn: 302964
---

diff --git a/llvm/include/llvm/CodeGen/GlobalISel/Utils.h b/llvm/include/llvm/CodeGen/GlobalISel/Utils.h
index 92bc973..69d5070 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/Utils.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/Utils.h
@@ -30,6 +30,7 @@ class TargetInstrInfo;
 class TargetPassConfig;
 class TargetRegisterInfo;
 class Twine;
+class ConstantFP;
 
 /// Try to constrain Reg so that it is usable by argument OpIdx of the
 /// provided MCInstrDesc \p II. If this fails, create a new virtual
@@ -62,6 +63,8 @@ void reportGISelFailure(MachineFunction &MF, const TargetPassConfig &TPC,
 
 Optional<int64_t> getConstantVRegVal(unsigned VReg,
                                      const MachineRegisterInfo &MRI);
+const ConstantFP* getConstantFPVRegVal(unsigned VReg,
+                                       const MachineRegisterInfo &MRI);
 
 } // End namespace llvm.
 #endif
diff --git a/llvm/lib/CodeGen/GlobalISel/Utils.cpp b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
index 3c93f81..254bdf1 100644
--- a/llvm/lib/CodeGen/GlobalISel/Utils.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
@@ -110,3 +110,11 @@ Optional<int64_t> llvm::getConstantVRegVal(unsigned VReg,
 
   return None;
 }
+
+const llvm::ConstantFP* llvm::getConstantFPVRegVal(unsigned VReg,
+                                       const MachineRegisterInfo &MRI) {
+  MachineInstr *MI = MRI.getVRegDef(VReg);
+  if (TargetOpcode::G_FCONSTANT != MI->getOpcode())
+    return nullptr;
+  return MI->getOperand(1).getFPImm();
+}