[PATCH] D22594: AMDGPU: Make skip threshold an option

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: kzhuravl, arsenm.

https://reviews.llvm.org/D22594

Files:
  lib/Target/AMDGPU/SILowerControlFlow.cpp

Index: lib/Target/AMDGPU/SILowerControlFlow.cpp
===================================================================
--- lib/Target/AMDGPU/SILowerControlFlow.cpp
+++ lib/Target/AMDGPU/SILowerControlFlow.cpp
@@ -66,12 +66,16 @@
 
 namespace {
 
+static cl::opt<unsigned> SkipThresholdFlag(
+  "amdgpu-skip-threshold",
+  cl::desc("Number of instructions before jumping over divergent control flow"),
+  cl::init(12), cl::Hidden);
+
 class SILowerControlFlow : public MachineFunctionPass {
 private:
-  static const unsigned SkipThreshold = 12;
-
   const SIRegisterInfo *TRI;
   const SIInstrInfo *TII;
+  unsigned SkipThreshold;
 
   bool shouldSkip(MachineBasicBlock *From, MachineBasicBlock *To);
 
@@ -95,7 +99,7 @@
   static char ID;
 
   SILowerControlFlow() :
-    MachineFunctionPass(ID), TRI(nullptr), TII(nullptr) { }
+    MachineFunctionPass(ID), TRI(nullptr), TII(nullptr), SkipThreshold(0) { }
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 
@@ -405,6 +409,7 @@
   const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
   TII = ST.getInstrInfo();
   TRI = &TII->getRegisterInfo();
+  SkipThreshold = SkipThresholdFlag;
 
   SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
 


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