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GPGPU: Pass context parameters to GPU kernel

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llvm-svn: 276963
This commit is contained in:
Tobias Grosser 2016-07-28 06:47:59 +00:00
parent a490147c90
commit d8b94bcac1
2 changed files with 78 additions and 0 deletions
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18
polly/lib/CodeGen/PPCGCodeGeneration.cpp
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@ -929,6 +929,24 @@ Value *GPUNodeBuilder::createLaunchParameters(ppcg_kernel *Kernel,
Index++; Index++;
} }
int NumVars = isl_space_dim(Kernel->space, isl_dim_param);
for (long i = 0; i < NumVars; i++) {
isl_id *Id = isl_space_get_dim_id(Kernel->space, isl_dim_param, i);
Value *Val = IDToValue[Id];
isl_id_free(Id);
Instruction *Param = new AllocaInst(
Val->getType(), Launch + "_param_" + std::to_string(Index),
EntryBlock->getTerminator());
Builder.CreateStore(Val, Param);
Value *Slot = Builder.CreateGEP(
Parameters, {Builder.getInt64(0), Builder.getInt64(Index)});
Value *ParamTyped =
Builder.CreatePointerCast(Param, Builder.getInt8PtrTy());
Builder.CreateStore(ParamTyped, Slot);
Index++;
}
auto Location = EntryBlock->getTerminator(); auto Location = EntryBlock->getTerminator();
return new BitCastInst(Parameters, Builder.getInt8PtrTy(), return new BitCastInst(Parameters, Builder.getInt8PtrTy(),
Launch + "_params_i8ptr", Location); Launch + "_params_i8ptr", Location);

60
polly/test/GPGPU/parametric-loop-bound.ll Normal file
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@ -0,0 +1,60 @@
; RUN: opt %loadPolly -polly-codegen-ppcg -polly-acc-dump-code \
; RUN: -disable-output < %s | \
; RUN: FileCheck -check-prefix=CODE %s
; RUN: opt %loadPolly -polly-codegen-ppcg \
; RUN: -S < %s | \
; RUN: FileCheck -check-prefix=IR %s
;
; void foo(long A[], long n) {
; for (long i = 0; i < n; i++)
; A[i] += 100;
; }
; CODE: if (n >= 1) {
; CODE-NEXT: cudaCheckReturn(cudaMemcpy(dev_MemRef_A, MemRef_A, (n) * sizeof(i64), cudaMemcpyHostToDevice));
; CODE-NEXT: {
; CODE-NEXT: dim3 k0_dimBlock(32);
; CODE-NEXT: dim3 k0_dimGrid(n >= 1048546 ? 32768 : floord(n + 31, 32));
; CODE-NEXT: kernel0 <<<k0_dimGrid, k0_dimBlock>>> (dev_MemRef_A, n);
; CODE-NEXT: cudaCheckKernel();
; CODE-NEXT: }
; CODE: cudaCheckReturn(cudaMemcpy(MemRef_A, dev_MemRef_A, (n) * sizeof(i64), cudaMemcpyDeviceToHost));
; CODE-NEXT: }
; CODE: # kernel0
; CODE-NEXT: for (int c0 = 0; c0 <= (n - 32 * b0 - 1) / 1048576; c0 += 1)
; CODE-NEXT: if (n >= 32 * b0 + t0 + 1048576 * c0 + 1)
; CODE-NEXT: Stmt_bb2(32 * b0 + t0 + 1048576 * c0);
; IR: store i64 %n, i64* %polly_launch_0_param_1
; IR-NEXT: %8 = getelementptr [2 x i8*], [2 x i8*]* %polly_launch_0_params, i64 0, i64 1
; IR-NEXT: %9 = bitcast i64* %polly_launch_0_param_1 to i8*
; IR-NEXT: store i8* %9, i8** %8
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @foo(i64* %A, i64 %n) {
bb:
br label %bb1
bb1: ; preds = %bb6, %bb
%i.0 = phi i64 [ 0, %bb ], [ %tmp7, %bb6 ]
%tmp = icmp slt i64 %i.0, %n
br i1 %tmp, label %bb2, label %bb8
bb2: ; preds = %bb1
%tmp3 = getelementptr inbounds i64, i64* %A, i64 %i.0
%tmp4 = load i64, i64* %tmp3, align 8
%tmp5 = add nsw i64 %tmp4, 100
store i64 %tmp5, i64* %tmp3, align 8
br label %bb6
bb6: ; preds = %bb2
%tmp7 = add nuw nsw i64 %i.0, 1
br label %bb1
bb8: ; preds = %bb1
ret void
}