[AMDGPU] Port of HSAIL inliner

[rampitec]

Added OptimizationRemarkEmitter as now in master.

[rampitec]

Ping

[alfred.j.huang]

Look fine. Cosmetic questions from me. Thanks!

lib/Target/AMDGPU/AMDGPUInline.cpp

118

Accumulation of all pointer args to private array, if total size exceeds ArgAllocaCutoff, then bail out. Look fine. I was just confused initially with the comment.

187

CS.getCaller() doesn't need to be called again? Caller set previously.

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

329

This mean if EnableAMDGPUFunctionCalls is set, we will not have early inline anymore?

test/CodeGen/AMDGPU/amdgpu-inline.ll

44

Is existence of "tail call @foo" considered @foo inlined? @foo should be inlined, right?

[rampitec]

Removed extra CS.getCaller() call.

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

329

We will not have early inline *all*. We always have selective early inline because we are running opt with the FE before linking, but w/o this new inlining pass it was a pristine llvm simple inliner which did not inline a lot of functions where we would like to see them inlined. Now the default inliner is replaced with our more aggressive version. If still runs twice with both invocations of opt, but it does not need a special pass to mark every function always_inline (which is in a nutshell what -amdgpu-early-inline-all does).

Moreover, w/o this change even if we enable calls we will get no calls, as all of the functions will be marked always_inline and then inlined. Then eventually the whole AMDGPUAlwaysInlinePass pass shall be removed when we enable calls.

test/CodeGen/AMDGPU/amdgpu-inline.ll

44

It is GCN-INL1 check, which constitutes to the call with -inline-threshold=1. I.e. for the test purposes I'm practically asking not to inline conventional functions, unless they have a really good reason to be inlined (like use of scratch).

The check GCN-INLDEF below represents default threshold under which foo supposed to be inlined.

[arsenm]

I don't like the idea of having a custom inlined, and thinking about this is very premature. We haven't attempted any benchmarking of calls or looked at current inlining behavior or if it could be improved. I would rather not commit this until it is clear it is absolutely necessary.

[rampitec]

In D36849#851079, @arsenm wrote:

I don't like the idea of having a custom inlined, and thinking about this is very premature. We haven't attempted any benchmarking of calls or looked at current inlining behavior or if it could be improved. I would rather not commit this until it is clear it is absolutely necessary.

We did a lot of benchmarking with HSAIL. LLVM general inliner did not change much since then and does not factor stuff important for us.

[arsenm]

In D36849#851091, @rampitec wrote:

In D36849#851079, @arsenm wrote:

I don't like the idea of having a custom inlined, and thinking about this is very premature. We haven't attempted any benchmarking of calls or looked at current inlining behavior or if it could be improved. I would rather not commit this until it is clear it is absolutely necessary.

We did a lot of benchmarking with HSAIL. LLVM general inliner did not change much since then and does not factor stuff important for us.

It's not really meaningful to compare inlining of HSAIL to AMDGPU. HSAIL never implemented any of the TTI cost model (and actually really completely broke it) plus other ABI differences. HSAIL was always using the default ABI using sret / byval among other differences.

[rampitec]

In D36849#853144, @arsenm wrote:

In D36849#851091, @rampitec wrote:

In D36849#851079, @arsenm wrote:

I don't like the idea of having a custom inlined, and thinking about this is very premature. We haven't attempted any benchmarking of calls or looked at current inlining behavior or if it could be improved. I would rather not commit this until it is clear it is absolutely necessary.

We did a lot of benchmarking with HSAIL. LLVM general inliner did not change much since then and does not factor stuff important for us.

It's not really meaningful to compare inlining of HSAIL to AMDGPU. HSAIL never implemented any of the TTI cost model (and actually really completely broke it) plus other ABI differences. HSAIL was always using the default ABI using sret / byval among other differences.

What in the default inliner will bump threshold if private pointer is passed?

[rampitec]

In D36849#853144, @arsenm wrote:

HSAIL never implemented any of the TTI cost model

And this is also completely false statement.

[arsenm]

lib/Target/AMDGPU/AMDGPUInline.cpp

31–33

We should avoid having a custom version of the exact same flag that the regular inliner uses. This would result in some surprises.

54

Hardcoded threshold. We should rely on the default opt-level based thresholds and override getInliningThresholdMultiplier to get the larger target default. That way the standard flags will work as expected.

113

Early return if no callee rather than wrapping the rest of the function in if

121

Skip potentially costly GetUnderlyingObject call if the address space isn't private

124–125

I'm pretty sure you aren't allowed to alloca an unsized type, so this check isn't needed.

However you do need to check / skip dynamically sized allocas.

167–175

Call the base implementation and see if it says always or never first rather than reproducing the logic?

177–178

Wrapper calls will (ignoring no inline) always be inlined by the stock inline heuristics, so †his shouldn't be necessary

181–183

This heuristic doesn't make any sense to me. Why does the block count matter? Just use the default cost.

test/CodeGen/AMDGPU/amdgpu-inline.ll

76

Needs tests with multiple private pointers and with the alloca size threshold exceeded

[rampitec]

Addressed review comments.
Rebased to master.
Added detection of the case when a subscript of the same alloca passed multiple times - count it as just a single alloca (found while forging new test).

lib/Target/AMDGPU/AMDGPUInline.cpp

31–33

Stock inline hint threshold is only 44% higher than regular threshold. Here I have it 6 times higher. The exact number may and will change, but when I return 9 from getInliningThresholdMultiplier() and multiply hint by the very same number it still will be a very low number, far less than we would really like to have.

124–125

That was for opaque types which we do not use now, and we had allocas on them.

167–175

Base implementation is pure virtual. I could call llvm::getInlineCost() instead directly (it is called from SimpleInliner::getInlineCost() anyway) two times, but I want to avoid expensive CallAnalyzer.

177–178

That is unless we hit MaxBB, in which case we still want to inline it.

181–183

That is to prevent huge compilation time of some programs. Not an ideal heuristic, but better than nothing.

[arsenm]

lib/Target/AMDGPU/AMDGPUInline.cpp

31–33

If that is really a problem we should find a different solution. I really don't want to have the set of flags for debugging this changing.

[rampitec]

lib/Target/AMDGPU/AMDGPUInline.cpp

31–33

OK, when we hit it next time I guess we could expose something from TTI.

[rampitec]

Removed custom inline hint threshold.

[arsenm]

lib/Target/AMDGPU/AMDGPUInline.cpp

177–178

By doing this you could possibly be allowing inlining with incompatible function attributes. llvm:::getInlineCost has the additional functionsHaveCompatibleAttributes check, which is more than the above areInlineCompatible

181–183

Compilation time from what? That it requires this custom wrapper function checking sounds like additional motivation to drop it.

lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h

165–166 ↗

(On Diff #113563)

How did you decide 9 for this?

[rampitec]

lib/Target/AMDGPU/AMDGPUInline.cpp

181–183

The actual testcase which required that was VRay AFAIR. When we increase inline threshold (or inline everything like now) we a vulnerable to extremely high compilation times for huge codes. In case of VRay it was hours, and this has decreased it to minutes.

lib/Target/AMDGPU/AMDGPUTargetTransformInfo.h

165–166 ↗

(On Diff #113563)

This is the rounded ratio of standard inline threshold and that tuned for HSAIL. Later we will need to retune.

[rampitec]

lib/Target/AMDGPU/AMDGPUInline.cpp

177–178

areInlineCompatible() is called earlier at line 167. If they do not we will not get to this point.

[tstellar]

There should be an explanation of what this pass does and why it is better than LLVM's default inliner and some benchmark data showing which applications / games this helps.

[rampitec]

Added file brief and more comments for thresholds.

[rampitec]

In D36849#866812, @tstellar wrote:

There should be an explanation of what this pass does and why it is better than LLVM's default inliner and some benchmark data showing which applications / games this helps.

Explanation added. For the benchmarks, the one I used was Luxmark, where it gave ~12% better result comparing to standard inliner. For the others it does not look like it makes a lot of sense to try to recollect old HSAIL numbers.
This pass is ported because we know in advance there is an issue like this. As said before cost model is different and some tuning will be also required later when we turn call support on.

[arsenm]

lib/Target/AMDGPU/AMDGPUInline.cpp

181–183

I meant where was the compile time spent? I doubt it was the inliner itself

[rampitec]

lib/Target/AMDGPU/AMDGPUInline.cpp

181–183

As usual, optimizing inflated code, scheduling and RA.

[arsenm]

lib/Target/AMDGPU/AMDGPUInline.cpp

181–183

I'd rather drop this workaround for now at least.

[rampitec]

Removed MaxBB limit.

lib/Target/AMDGPU/AMDGPUInline.cpp

177–178

AFAIR I've seen cases when our library call wrappers were not inlined even with relatively small programs.

181–183

OK

[arsenm]

LGTM. It does look like the default inline heuristic does consider the SROAability of the passed arguments to some degree

[rampitec]

Rebase to master.

lib/Target/AMDGPU/AMDGPU.h

 void initializeAMDGPUUnifyDivergentExitNodesPass(PassRegistry&);
 extern char &AMDGPUUnifyDivergentExitNodesID;
 
 ImmutablePass *createAMDGPUAAWrapperPass();
 void initializeAMDGPUAAWrapperPassPass(PassRegistry&);
 
 void initializeAMDGPUArgumentUsageInfoPass(PassRegistry &);
 
+Pass *createAMDGPUFunctionInliningPass();
+void initializeAMDGPUInlinerPass(PassRegistry&);
+
 Target &getTheAMDGPUTarget();
 Target &getTheGCNTarget();
 
 namespace AMDGPU {
 enum TargetIndex {
   TI_CONSTDATA_START,
   TI_SCRATCH_RSRC_DWORD0,
   TI_SCRATCH_RSRC_DWORD1,

lib/Target/AMDGPU/AMDGPUInline.cpp

+//===- AMDGPUInline.cpp - Code to perform simple function inlining --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPU.h"
+#include "llvm/Transforms/IPO.h"
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/Analysis/InlineCost.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/IR/CallSite.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Type.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Transforms/IPO/Inliner.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "inline"
+
+static cl::opt<int>
+HintThreshold("amdgpu-inlinehint-threshold", cl::Hidden, cl::init(12000),
+              cl::desc("Threshold for inlining functions with inline hint"));
+
+static cl::opt<int>
+ArgAllocaCost("amdgpu-inline-arg-alloca-cost", cl::Hidden, cl::init(20000),
+              cl::desc("Cost of alloca argument"));
+
+static cl::opt<unsigned>
+ArgAllocaCutoff("amdgpu-inline-arg-alloca-cutoff", cl::Hidden, cl::init(256),
+                cl::desc("Maximum alloca size to use for inline cost"));
+
+static cl::opt<size_t>
+MaxBB("amdgpu-inline-max-bb", cl::Hidden, cl::init(300),
+      cl::desc("Maximum BB number allowed in a function after inlining"));
+
+namespace {
+
+class AMDGPUInliner : public LegacyInlinerBase {
+
+public:
+  AMDGPUInliner() : LegacyInlinerBase(ID) {
+    initializeAMDGPUInlinerPass(*PassRegistry::getPassRegistry());
+    Params = getInlineParams(2000);
+    Params.HintThreshold = HintThreshold;
+  }
+
+  static char ID; // Pass identification, replacement for typeid
+
+  unsigned getInlineThreshold(CallSite CS) const;
+
+  InlineCost getInlineCost(CallSite CS) override;
+
+  bool runOnSCC(CallGraphSCC &SCC) override;
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+private:
+  TargetTransformInfoWrapperPass *TTIWP;
+
+  InlineParams Params;
+};
+
+} // end anonymous namespace
+
+char AMDGPUInliner::ID = 0;
+INITIALIZE_PASS_BEGIN(AMDGPUInliner, "amdgpu-inline",
+                "AMDGPU Function Integration/Inlining", false, false)
+INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
+INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
+INITIALIZE_PASS_END(AMDGPUInliner, "amdgpu-inline",
+                "AMDGPU Function Integration/Inlining", false, false)
+
+Pass *llvm::createAMDGPUFunctionInliningPass() { return new AMDGPUInliner(); }
+
+bool AMDGPUInliner::runOnSCC(CallGraphSCC &SCC) {
+  TTIWP = &getAnalysis<TargetTransformInfoWrapperPass>();
+  return LegacyInlinerBase::runOnSCC(SCC);
+}
+
+void AMDGPUInliner::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.addRequired<TargetTransformInfoWrapperPass>();
+  LegacyInlinerBase::getAnalysisUsage(AU);
+}
+
+unsigned AMDGPUInliner::getInlineThreshold(CallSite CS) const {
+  int Thres = Params.DefaultThreshold;
+
+  Function *Caller = CS.getCaller();
+  // Listen to the inlinehint attribute when it would increase the threshold
+  // and the caller does not need to minimize its size.
+  Function *Callee = CS.getCalledFunction();
+  bool InlineHint = Callee && !Callee->isDeclaration() &&
+    Callee->hasFnAttribute(Attribute::InlineHint);
+  if (InlineHint && HintThreshold > Thres
+      && !Caller->hasFnAttribute(Attribute::MinSize))
+    Thres = HintThreshold;
+
+  const DataLayout &DL = Caller->getParent()->getDataLayout();
+  if (Callee) {
+    // If we have a pointer to private array passed into a function
+    // it will not be optimized out, leaving scratch usage.
+    // Increase the inline threshold to allow inliniting in this case.
+    uint64_t AllocaSize = 0;
+    for (Value *PtrArg : CS.args()) {
+      if (!PtrArg->getType()->isPointerTy())
+        continue;
+      PtrArg = GetUnderlyingObject(PtrArg, DL);
+      if (const AllocaInst *AI = dyn_cast<AllocaInst>(PtrArg)) {
+        Type *Ty = AI->getAllocatedType();
+        if (!Ty->isSized())
+          continue;
+        AllocaSize += DL.getTypeAllocSize(Ty);
+        // If the amount of stack memory is excessive we will not be able
+        // to get rid of the scratch anyway, bail out.
+        if (AllocaSize > ArgAllocaCutoff) {
+          AllocaSize = 0;
+          break;
+        }
+      }
+    }
+    if (AllocaSize)
+      Thres += ArgAllocaCost;
+  }
+
+  return (unsigned)Thres;
+}
+
+// Check if call is just a wrapper around another call.
+// In this case we only have call and ret instructions.
+static bool isWrapperOnlyCall(CallSite CS) {
+  Function *Callee = CS.getCalledFunction();
+  if (!Callee || Callee->size() != 1)
+    return false;
+  const BasicBlock &BB = Callee->getEntryBlock();
+  if (const Instruction *I = BB.getFirstNonPHI()) {
+    if (!isa<CallInst>(I)) {
+      return false;
+    }
+    if (isa<ReturnInst>(*std::next(I->getIterator()))) {
+      DEBUG(dbgs() << "    Wrapper only call detected: "
+                   << Callee->getName() << '\n');
+      return true;
+    }
+  }
+  return false;
+}
+
+InlineCost AMDGPUInliner::getInlineCost(CallSite CS) {
+  Function *Callee = CS.getCalledFunction();
+  Function *Caller = CS.getCaller();
+  TargetTransformInfo &TTI = TTIWP->getTTI(*Callee);
+
+  if (!Callee || Callee->isDeclaration() || CS.isNoInline() ||
+      !TTI.areInlineCompatible(Caller, Callee))
+    return llvm::InlineCost::getNever();
+
+  if (CS.hasFnAttr(Attribute::AlwaysInline)) {
+    if (isInlineViable(*Callee))
+      return llvm::InlineCost::getAlways();
+    return llvm::InlineCost::getNever();
+  }
+
+  if (isWrapperOnlyCall(CS))
+    return llvm::InlineCost::getAlways();
+
+  // Single BB does not increase total BB amount, thus subtract 1
+  size_t Size = Caller->size() + Callee->size() - 1;
+  if (MaxBB && Size > MaxBB)
+    return InlineCost::getNever();
+
+  InlineParams LocalParams = Params;
+  LocalParams.DefaultThreshold = (int)getInlineThreshold(CS);
+  std::function<AssumptionCache &(Function &)> GetAssumptionCache =
+      [this](Function &F) -> AssumptionCache & {
+    return ACT->getAssumptionCache(F);
+  };
+
+  return llvm::getInlineCost(CS, Callee, LocalParams, TTI, GetAssumptionCache,
+                             None, PSI);
+}

lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

extern "C" void LLVMInitializeAMDGPUTarget() {
   initializeSIMemoryLegalizerPass(*PR);
   initializeSIDebuggerInsertNopsPass(*PR);
   initializeSIOptimizeExecMaskingPass(*PR);
   initializeSIFixWWMLivenessPass(*PR);
   initializeAMDGPUUnifyDivergentExitNodesPass(*PR);
   initializeAMDGPUAAWrapperPassPass(*PR);
   initializeAMDGPUUseNativeCallsPass(*PR);
   initializeAMDGPUSimplifyLibCallsPass(*PR);
+  initializeAMDGPUInlinerPass(*PR);
 }
 
 static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
   return llvm::make_unique<AMDGPUTargetObjectFile>();
 }
 
 static ScheduleDAGInstrs *createR600MachineScheduler(MachineSchedContext *C) {
   return new ScheduleDAGMILive(C, llvm::make_unique<R600SchedStrategy>());

 }
 
 void AMDGPUTargetMachine::adjustPassManager(PassManagerBuilder &Builder) {
   Builder.DivergentTarget = true;
 
   bool EnableOpt = getOptLevel() > CodeGenOpt::None;
   bool Internalize = InternalizeSymbols && EnableOpt &&
                      (getTargetTriple().getArch() == Triple::amdgcn);
-  bool EarlyInline = EarlyInlineAll && EnableOpt;
+  bool EarlyInline = EarlyInlineAll && EnableOpt && !EnableAMDGPUFunctionCalls;
   bool AMDGPUAA = EnableAMDGPUAliasAnalysis && EnableOpt;
   bool LibCallSimplify = EnableLibCallSimplify && EnableOpt;
 
+  Builder.Inliner = createAMDGPUFunctionInliningPass();
+
   Builder.addExtension(
     PassManagerBuilder::EP_ModuleOptimizerEarly,
     [Internalize, EarlyInline, AMDGPUAA](const PassManagerBuilder &,
                                          legacy::PassManagerBase &PM) {
       if (AMDGPUAA) {
         PM.add(createAMDGPUAAWrapperPass());
         PM.add(createAMDGPUExternalAAWrapperPass());
       }

lib/Target/AMDGPU/CMakeLists.txt

add_llvm_target(AMDGPUCodeGen
   AMDGPURegisterInfo.cpp
   AMDGPURewriteOutArguments.cpp
   AMDGPUSubtarget.cpp
   AMDGPUTargetMachine.cpp
   AMDGPUTargetObjectFile.cpp
   AMDGPUTargetTransformInfo.cpp
   AMDGPUUnifyDivergentExitNodes.cpp
   AMDGPUUnifyMetadata.cpp
+  AMDGPUInline.cpp
   AMDILCFGStructurizer.cpp
   GCNHazardRecognizer.cpp
   GCNIterativeScheduler.cpp
   GCNMinRegStrategy.cpp
   GCNRegPressure.cpp
   GCNSchedStrategy.cpp
   R600ClauseMergePass.cpp
   R600ControlFlowFinalizer.cpp

test/CodeGen/AMDGPU/amdgpu-inline.ll

+; RUN: opt -mtriple=amdgcn--amdhsa -O3 -S -amdgpu-function-calls -inline-threshold=1 < %s | FileCheck -check-prefix=GCN -check-prefix=GCN-INL1 %s
+; RUN: opt -mtriple=amdgcn--amdhsa -O3 -S -amdgpu-function-calls < %s | FileCheck -check-prefix=GCN -check-prefix=GCN-INLDEF %s
+
+define coldcc float @foo(float %x, float %y) {
+entry:
+  %cmp = fcmp ogt float %x, 0.000000e+00
+  %div = fdiv float %y, %x
+  %mul = fmul float %x, %y
+  %cond = select i1 %cmp, float %div, float %mul
+  ret float %cond
+}
+
+define coldcc void @foo_private_ptr(float* nocapture %p) {
+entry:
+  %tmp1 = load float, float* %p, align 4
+  %cmp = fcmp ogt float %tmp1, 1.000000e+00
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %div = fdiv float 1.000000e+00, %tmp1
+  store float %div, float* %p, align 4
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+define coldcc float @sin_wrapper(float %x) {
+bb:
+  %call = tail call float @_Z3sinf(float %x)
+  ret float %call
+}
+
+define void @foo_noinline(float* nocapture %p) #0 {
+entry:
+  %tmp1 = load float, float* %p, align 4
+  %mul = fmul float %tmp1, 2.000000e+00
+  store float %mul, float* %p, align 4
+  ret void
+}
+
+; GCN: define amdgpu_kernel void @test_inliner
+; GCN-INL1:   %c1 = tail call coldcc float @foo(
+; GCN-INLDEF: %cmp.i = fcmp ogt float %tmp2, 0.000000e+00
+; GCN:        %div.i{{[0-9]*}} = fdiv float 1.000000e+00, %c
+; GCN:        call void @foo_noinline(
+; GCN:        tail call float @_Z3sinf(
+define amdgpu_kernel void @test_inliner(float addrspace(1)* nocapture %a, i32 %n) {
+entry:
+  %pvt_arr = alloca [64 x float], align 4
+  %tid = tail call i32 @llvm.amdgcn.workitem.id.x()
+  %arrayidx = getelementptr inbounds float, float addrspace(1)* %a, i32 %tid
+  %tmp2 = load float, float addrspace(1)* %arrayidx, align 4
+  %add = add i32 %tid, 1
+  %arrayidx2 = getelementptr inbounds float, float addrspace(1)* %a, i32 %add
+  %tmp5 = load float, float addrspace(1)* %arrayidx2, align 4
+  %c1 = tail call coldcc float @foo(float %tmp2, float %tmp5)
+  %or = or i32 %tid, %n
+  %arrayidx5 = getelementptr inbounds [64 x float], [64 x float]* %pvt_arr, i32 0, i32 %or
+  store float %c1, float* %arrayidx5, align 4
+  %arrayidx7 = getelementptr inbounds [64 x float], [64 x float]* %pvt_arr, i32 0, i32 %or
+  call coldcc void @foo_private_ptr(float* %arrayidx7)
+  call void @foo_noinline(float* %arrayidx7)
+  %and = and i32 %tid, %n
+  %arrayidx11 = getelementptr inbounds [64 x float], [64 x float]* %pvt_arr, i32 0, i32 %and
+  %tmp12 = load float, float* %arrayidx11, align 4
+  %c2 = call coldcc float @sin_wrapper(float %tmp12)
+  store float %c2, float* %arrayidx7, align 4
+  %xor = xor i32 %tid, %n
+  %arrayidx16 = getelementptr inbounds [64 x float], [64 x float]* %pvt_arr, i32 0, i32 %xor
+  %tmp16 = load float, float* %arrayidx16, align 4
+  store float %tmp16, float addrspace(1)* %arrayidx, align 4
+  ret void
+}
+
+declare i32 @llvm.amdgcn.workitem.id.x() #1
+declare float @_Z3sinf(float) #1
+
+attributes #0 = { noinline }
+attributes #1 = { nounwind readnone }