From 721ebe8d5e2588fca5c051eb5acf6feb2bf536d7 Mon Sep 17 00:00:00 2001
From: Justin Lebar <jlebar@google.com>
Date: Wed, 27 Jul 2016 22:36:21 +0000
Subject: [PATCH] [CUDA] Align kernel launch args correctly when the LLVM
type's alignment is different from the clang type's alignment.
Summary:
Before this patch, we computed the offsets in memory of args passed to
GPU kernel functions by throwing all of the args into an LLVM struct.
clang emits packed llvm structs basically whenever it feels like it, and
packed structs have alignment 1. So we cannot rely on the llvm type's
alignment matching the C++ type's alignment.
This patch fixes our codegen so we always respect the clang types'
alignments.
Reviewers: rnk
Subscribers: cfe-commits, tra
Differential Revision: https://reviews.llvm.org/D22879
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@276927 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/CodeGen/CGCUDABuiltin.cpp | 6 ++++
lib/CodeGen/CGCUDANV.cpp | 41 +++++++++--------------
test/CodeGenCUDA/kernel-args-alignment.cu | 36 ++++++++++++++++++++
3 files changed, 58 insertions(+), 25 deletions(-)
create mode 100644 test/CodeGenCUDA/kernel-args-alignment.cu
diff --git a/lib/CodeGen/CGCUDABuiltin.cpp b/lib/CodeGen/CGCUDABuiltin.cpp
index ea3b888635c..44dd003757a 100644
--- a/lib/CodeGen/CGCUDABuiltin.cpp
+++ b/lib/CodeGen/CGCUDABuiltin.cpp
@@ -99,6 +99,12 @@ CodeGenFunction::EmitCUDADevicePrintfCallExpr(const CallExpr *E,
llvm::SmallVector<llvm::Type *, 8> ArgTypes;
for (unsigned I = 1, NumArgs = Args.size(); I < NumArgs; ++I)
ArgTypes.push_back(Args[I].RV.getScalarVal()->getType());
+
+ // Using llvm::StructType is correct only because printf doesn't accept
+ // aggregates. If we had to handle aggregates here, we'd have to manually
+ // compute the offsets within the alloca -- we wouldn't be able to assume
+ // that the alignment of the llvm type was the same as the alignment of the
+ // clang type.
llvm::Type *AllocaTy = llvm::StructType::create(ArgTypes, "printf_args");
llvm::Value *Alloca = CreateTempAlloca(AllocaTy);
diff --git a/lib/CodeGen/CGCUDANV.cpp b/lib/CodeGen/CGCUDANV.cpp
index 6a04d4eea78..3e1f2b5d1d1 100644
--- a/lib/CodeGen/CGCUDANV.cpp
+++ b/lib/CodeGen/CGCUDANV.cpp
@@ -118,37 +118,28 @@ void CGNVCUDARuntime::emitDeviceStub(CodeGenFunction &CGF,
void CGNVCUDARuntime::emitDeviceStubBody(CodeGenFunction &CGF,
FunctionArgList &Args) {
- // Build the argument value list and the argument stack struct type.
- SmallVector<llvm::Value *, 16> ArgValues;
- std::vector<llvm::Type *> ArgTypes;
- for (FunctionArgList::const_iterator I = Args.begin(), E = Args.end();
- I != E; ++I) {
- llvm::Value *V = CGF.GetAddrOfLocalVar(*I).getPointer();
- ArgValues.push_back(V);
- assert(isa<llvm::PointerType>(V->getType()) && "Arg type not PointerType");
- ArgTypes.push_back(cast<llvm::PointerType>(V->getType())->getElementType());
- }
- llvm::StructType *ArgStackTy = llvm::StructType::get(Context, ArgTypes);
-
- llvm::BasicBlock *EndBlock = CGF.createBasicBlock("setup.end");
-
- // Emit the calls to cudaSetupArgument
+ // Emit a call to cudaSetupArgument for each arg in Args.
llvm::Constant *cudaSetupArgFn = getSetupArgumentFn();
- for (unsigned I = 0, E = Args.size(); I != E; ++I) {
- llvm::Value *Args[3];
- llvm::BasicBlock *NextBlock = CGF.createBasicBlock("setup.next");
- Args[0] = CGF.Builder.CreatePointerCast(ArgValues[I], VoidPtrTy);
- Args[1] = CGF.Builder.CreateIntCast(
- llvm::ConstantExpr::getSizeOf(ArgTypes[I]),
- SizeTy, false);
- Args[2] = CGF.Builder.CreateIntCast(
- llvm::ConstantExpr::getOffsetOf(ArgStackTy, I),
- SizeTy, false);
+ llvm::BasicBlock *EndBlock = CGF.createBasicBlock("setup.end");
+ CharUnits Offset = CharUnits::Zero();
+ for (const VarDecl *A : Args) {
+ CharUnits TyWidth, TyAlign;
+ std::tie(TyWidth, TyAlign) =
+ CGM.getContext().getTypeInfoInChars(A->getType());
+ Offset = Offset.alignTo(TyAlign);
+ llvm::Value *Args[] = {
+ CGF.Builder.CreatePointerCast(CGF.GetAddrOfLocalVar(A).getPointer(),
+ VoidPtrTy),
+ llvm::ConstantInt::get(SizeTy, TyWidth.getQuantity()),
+ llvm::ConstantInt::get(SizeTy, Offset.getQuantity()),
+ };
llvm::CallSite CS = CGF.EmitRuntimeCallOrInvoke(cudaSetupArgFn, Args);
llvm::Constant *Zero = llvm::ConstantInt::get(IntTy, 0);
llvm::Value *CSZero = CGF.Builder.CreateICmpEQ(CS.getInstruction(), Zero);
+ llvm::BasicBlock *NextBlock = CGF.createBasicBlock("setup.next");
CGF.Builder.CreateCondBr(CSZero, NextBlock, EndBlock);
CGF.EmitBlock(NextBlock);
+ Offset += TyWidth;
}
// Emit the call to cudaLaunch
diff --git a/test/CodeGenCUDA/kernel-args-alignment.cu b/test/CodeGenCUDA/kernel-args-alignment.cu
new file mode 100644
index 00000000000..4bd5eb1bb1f
--- /dev/null
+++ b/test/CodeGenCUDA/kernel-args-alignment.cu
@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 --std=c++11 -triple x86_64-unknown-linux-gnu -emit-llvm -o - %s | \
+// RUN: FileCheck -check-prefix HOST -check-prefix CHECK %s
+
+// RUN: %clang_cc1 --std=c++11 -fcuda-is-device -triple nvptx64-nvidia-cuda \
+// RUN: -emit-llvm -o - %s | FileCheck -check-prefix DEVICE -check-prefix CHECK %s
+
+#include "Inputs/cuda.h"
+
+struct U {
+ short x;
+} __attribute__((packed));
+
+struct S {
+ int *ptr;
+ char a;
+ U u;
+};
+
+// Clang should generate a packed LLVM struct for S (denoted by the <>s),
+// otherwise this test isn't interesting.
+// CHECK: %struct.S = type <{ i32*, i8, %struct.U, [5 x i8] }>
+
+static_assert(alignof(S) == 8, "Unexpected alignment.");
+
+// HOST-LABEL: @_Z6kernelc1SPi
+// Marshalled kernel args should be:
+// 1. offset 0, width 1
+// 2. offset 8 (because alignof(S) == 8), width 16
+// 3. offset 24, width 8
+// HOST: call i32 @cudaSetupArgument({{[^,]*}}, i64 1, i64 0)
+// HOST: call i32 @cudaSetupArgument({{[^,]*}}, i64 16, i64 8)
+// HOST: call i32 @cudaSetupArgument({{[^,]*}}, i64 8, i64 24)
+
+// DEVICE-LABEL: @_Z6kernelc1SPi
+// DEVICE-SAME: i8{{[^,]*}}, %struct.S* byval align 8{{[^,]*}}, i32*
+__global__ void kernel(char a, S s, int *b) {}
--
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