[Driver][clang-linker-wrapper] Add initial support for OpenMP offloading to generic SPIR-V #120145

sarnex · 2024-12-16T21:00:30Z

This is the first of a series of patches to add support for OpenMP offloading to SPIR-V through liboffload with the first intended target being Intel GPUs. This patch implements the basic driver and clang-linker-wrapper work for JIT mode. There are still many missing pieces, so this is not yet usable.

We introduce spirv64-intel-unknown as the only currently supported triple. The user-facing argument to enable offloading will be -fopenmp -fopenmp-targets=spirv64-intel

Add a new SPIRVOpenMPToolChain toolchain based on the existing general SPIR-V toolchain which will call all the required SPIR-V tools (and eventually the SPIR-V backend) as well as add the corresponding device RTL as an argument to the linker.

We can't get through the front end consistently yet, so it's difficult to add any LIT tests that execute any tools, but front end changes are planned very shortly, and then we can add those tests.

…ing to generic SPIR-V This is the first of a series of patches to add support for OpenMP offloading to SPIR-V through liboffload with the first intended target being Intel GPUs. This patch implements the basic driver and `clang-linker-wrapper` work for JIT mode. There are still many missing pieces, so this is not yet usable. We introduce `spirv64-intel-unknown` as the only currently supported triple. The user-facing argument to enable offloading will be `-fopenmp -fopenmp-targets=spirv64-intel` Add a new `SPIRVOpenMPToolChain` toolchain based on the existing general SPIR-V toolchain which will call all the required SPIR-V tools as well as add the device RTL as an argument to the linker. As there is no production quality SPIR-V linker available, manually create an ELF binary containing the offloading image in a way that fits into the existing `liboffload` infrastructure. This ELF will eventually be passed to a runtime plugin that interacts with the Intel GPU runtime. There is also a small fix to an issue I found when trying to assemble SPIR-V when in text format. Signed-off-by: Sarnie, Nick <[email protected]>

github-actions · 2024-12-16T21:03:47Z

✅ With the latest revision this PR passed the C/C++ code formatter.

Signed-off-by: Sarnie, Nick <[email protected]>

llvmbot · 2024-12-17T14:49:04Z

@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-backend-spir-v

Author: Nick Sarnie (sarnex)

Changes

This is the first of a series of patches to add support for OpenMP offloading to SPIR-V through liboffload with the first intended target being Intel GPUs. This patch implements the basic driver and clang-linker-wrapper work for JIT mode. There are still many missing pieces, so this is not yet usable.

We introduce spirv64-intel-unknown as the only currently supported triple. The user-facing argument to enable offloading will be -fopenmp -fopenmp-targets=spirv64-intel

Add a new SPIRVOpenMPToolChain toolchain based on the existing general SPIR-V toolchain which will call all the required SPIR-V tools (and eventually the SPIR-V backend) as well as add the corresponding device RTL as an argument to the linker.

As there is no production quality SPIR-V linker available, manually create an ELF binary containing the offloading image in a way that fits into the existing liboffload plugin infrastructure. This ELF will eventually be passed to a runtime plugin that interacts with the Intel GPU runtime.

We can't get through the front end consistently yet, so it's difficult to add any LIT tests that execute any tools, but front end changes are planned very shortly, and then we can add those tests.

There is also a small fix to an issue I found when trying to assemble SPIR-V when in text format.

Patch is 53.61 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/120145.diff

18 Files Affected:

(modified) clang/include/clang/Driver/Options.td (+2)
(modified) clang/lib/Driver/CMakeLists.txt (+1)
(modified) clang/lib/Driver/Driver.cpp (+35-5)
(modified) clang/lib/Driver/ToolChains/CommonArgs.cpp (+6-3)
(modified) clang/lib/Driver/ToolChains/SPIRV.cpp (+4-1)
(modified) clang/lib/Driver/ToolChains/SPIRV.h (+1-1)
(added) clang/lib/Driver/ToolChains/SPIRVOpenMP.cpp (+38)
(added) clang/lib/Driver/ToolChains/SPIRVOpenMP.h (+29)
(modified) clang/lib/Frontend/CompilerInvocation.cpp (+1)
(added) clang/test/Driver/Inputs/spirv-openmp/lib/libomptarget-spirv64-spirv64-intel.bc ()
(added) clang/test/Driver/spirv-openmp-toolchain.c (+71)
(modified) clang/test/Driver/spirv-toolchain.cl (+3-3)
(modified) clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp (+11-6)
(modified) llvm/include/llvm/Frontend/Offloading/Utility.h (+5)
(modified) llvm/include/llvm/TargetParser/Triple.h (+2-1)
(modified) llvm/lib/Frontend/Offloading/CMakeLists.txt (+1)
(modified) llvm/lib/Frontend/Offloading/Utility.cpp (+86)
(modified) llvm/lib/TargetParser/Triple.cpp (+18-15)

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[truncated]

llvmbot · 2024-12-17T14:49:05Z

@llvm/pr-subscribers-clang

Author: Nick Sarnie (sarnex)

Changes

This is the first of a series of patches to add support for OpenMP offloading to SPIR-V through liboffload with the first intended target being Intel GPUs. This patch implements the basic driver and clang-linker-wrapper work for JIT mode. There are still many missing pieces, so this is not yet usable.

We introduce spirv64-intel-unknown as the only currently supported triple. The user-facing argument to enable offloading will be -fopenmp -fopenmp-targets=spirv64-intel

Add a new SPIRVOpenMPToolChain toolchain based on the existing general SPIR-V toolchain which will call all the required SPIR-V tools (and eventually the SPIR-V backend) as well as add the corresponding device RTL as an argument to the linker.

As there is no production quality SPIR-V linker available, manually create an ELF binary containing the offloading image in a way that fits into the existing liboffload plugin infrastructure. This ELF will eventually be passed to a runtime plugin that interacts with the Intel GPU runtime.

We can't get through the front end consistently yet, so it's difficult to add any LIT tests that execute any tools, but front end changes are planned very shortly, and then we can add those tests.

There is also a small fix to an issue I found when trying to assemble SPIR-V when in text format.

Patch is 53.61 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/120145.diff

18 Files Affected:

(modified) clang/include/clang/Driver/Options.td (+2)
(modified) clang/lib/Driver/CMakeLists.txt (+1)
(modified) clang/lib/Driver/Driver.cpp (+35-5)
(modified) clang/lib/Driver/ToolChains/CommonArgs.cpp (+6-3)
(modified) clang/lib/Driver/ToolChains/SPIRV.cpp (+4-1)
(modified) clang/lib/Driver/ToolChains/SPIRV.h (+1-1)
(added) clang/lib/Driver/ToolChains/SPIRVOpenMP.cpp (+38)
(added) clang/lib/Driver/ToolChains/SPIRVOpenMP.h (+29)
(modified) clang/lib/Frontend/CompilerInvocation.cpp (+1)
(added) clang/test/Driver/Inputs/spirv-openmp/lib/libomptarget-spirv64-spirv64-intel.bc ()
(added) clang/test/Driver/spirv-openmp-toolchain.c (+71)
(modified) clang/test/Driver/spirv-toolchain.cl (+3-3)
(modified) clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp (+11-6)
(modified) llvm/include/llvm/Frontend/Offloading/Utility.h (+5)
(modified) llvm/include/llvm/TargetParser/Triple.h (+2-1)
(modified) llvm/lib/Frontend/Offloading/CMakeLists.txt (+1)
(modified) llvm/lib/Frontend/Offloading/Utility.cpp (+86)
(modified) llvm/lib/TargetParser/Triple.cpp (+18-15)

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...
[truncated]

sarnex · 2024-12-17T14:51:51Z

Would also appreciate a review from @jhuber6!

jhuber6 · 2024-12-17T14:55:14Z

clang/lib/Driver/ToolChains/CommonArgs.cpp

@@ -2829,10 +2829,13 @@ void tools::addOpenMPDeviceRTL(const Driver &D,
    LibraryPaths.emplace_back(LibPath);

  OptSpecifier LibomptargetBCPathOpt =
-      Triple.isAMDGCN() ? options::OPT_libomptarget_amdgpu_bc_path_EQ
-                        : options::OPT_libomptarget_nvptx_bc_path_EQ;
+      Triple.isAMDGCN()  ? options::OPT_libomptarget_amdgpu_bc_path_EQ


Does SPIR-V still rely on the mlink-builtin-bitcode hack instead of LTO? The SPIR-V backend should be usable soon from what I hear, so that's the ideal going forward.

Yes, we're linking the DeviceRTL using mlink-builtin-bitcode today, but we definitely want to use LTO in the future, both for OpenMP and SYCL.

Is there a patch for the DeviceRTL build? I've been meaning to gut a lot of that starting with #119091 and soon removing the whole bundling thing so it's more like libc.a. ideally we'd have lib/spirv64-intel-unknown/libomp.a and the driver just passes -Xoffload-linker -lomp.

Not yet, we hit some issues in the front end generating OpenMP device code with the SPIR-V target, so we can't build it yet because it doesn't make it through the compiler. Any change should be with fine with us, we should be able to adapt to whatever infrastructure there is to build the DeviceRTL. thanks.

jhuber6 · 2024-12-17T14:55:36Z

clang/lib/Driver/Driver.cpp

@@ -922,6 +947,8 @@ void Driver::CreateOffloadingDeviceToolChains(Compilation &C,
                   IsAMDOffloadArch(StringToOffloadArch(
                       getProcessorFromTargetID(*AMDTriple, Arch)))) {
          DerivedArchs[AMDTriple->getTriple()].insert(Arch);
+        } else if (SPIRVTriple && Arch == (*SPIRVTriple).str()) {


What is Arch here exactly? My understanding is that SPIR-V has no concept of -mcpu arguments.

Yeah so here this is a case where SPIR-V is an outlier so stuff gets weird. This code gets hit when -fopenmp is passed, -fopenmp-targets is not passed, and --offload-arch is passed and we need to deduce the toolchain based on the offload arch. I implemented it such that you can pass spirv64-intel to --offload-arch and it will use the SPIR-V OpenMP toolchain. Arch will be spirv64-intel so we go inside the if and everything works.

Another option is that we could not allow the spirv64-intel option to --offload-arch to deduce to the SPIR-V OpenMP toolchain in this case, so basically you can't use --offload-arch with this toolchain. Maybe that's philosophically better.

Let me know what you think.

This is related to discussions I've had with @AlexVlx who is working on SPIR-V for HIP, but I strongly believe that we should deprecate -fopenmp-targets= and --offload-arch= should not be used for SPIR-V. We should fix-up the --offload= option to take the list of toolchains directly, and --offload-arch= should be used as a shorthand infereence. Then have -Xoffload-<triple> -arg to control specific arguments to toolchains.

Sure, if that's is the direction we're going I can just remove this code so --offload-arch errors and you need -fopenmp-targets=spirv64-intel for now until the --offload option is updated.

jhuber6 · 2024-12-17T14:56:03Z

clang/lib/Driver/ToolChains/SPIRV.cpp

  if (Output.getType() == types::TY_PP_Asm)
-    CmdArgs.push_back("--spirv-tools-dis");
+    CmdArgs.push_back("--spirv-text");


This should be a separate fix most likely.

Sure, will drop this, thanks.

#120266

jhuber6 · 2024-12-17T14:56:36Z

clang/lib/Frontend/CompilerInvocation.cpp

@@ -4256,6 +4256,7 @@ bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,

      if (TT.getArch() == llvm::Triple::UnknownArch ||
          !(TT.getArch() == llvm::Triple::aarch64 || TT.isPPC() ||
+            TT.getArch() == llvm::Triple::spirv64 ||


Honestly the more I see added to this big if statement the more I'm convinced it doesn't need to exist.

Right now it's at least throwing an error if the triple doesn't match the list, so there might be some case where removing the error will break something, so I'd prefer to not potentially introduce a bug in a possibly untested area.

jhuber6 · 2024-12-17T14:57:00Z

clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp

@@ -595,6 +595,7 @@ Expected<StringRef> linkDevice(ArrayRef<StringRef> InputFiles,
  case Triple::aarch64_be:
  case Triple::ppc64:
  case Triple::ppc64le:
+  case Triple::spirv64:


Some recent changes here for looongarch might need to rebase.

Will do, thanks

jhuber6 · 2024-12-17T14:57:40Z

clang/tools/clang-linker-wrapper/ClangLinkerWrapper.cpp

@@ -735,11 +736,15 @@ wrapDeviceImages(ArrayRef<std::unique_ptr<MemoryBuffer>> Buffers,
 }

 Expected<SmallVector<std::unique_ptr<MemoryBuffer>>>
-bundleOpenMP(ArrayRef<OffloadingImage> Images) {
+bundleOpenMP(SmallVectorImpl<OffloadingImage> &Images) {


Why does the container need to be mutable now?

It's mutable because we modify it inside bundleOpenMP if the vendor is Intel, where we call containerizeOpenMPSPIRVImage to put the device image into an ELF (which we can't do using clang because there's no SPIR-V linker). I agree it's not ideal to have to modify the image here, if you have a better spot to do that ELF packaging, let me know. Thanks

But this function's job is to return a new list of binary files after serializing the input, can't it just be put in the output?

Somehow I convinced myself it might be more performant to do it this way, but I'm not so sure that's true after all, let me try to just modify the serialized input, thanks for the suggestion.

jhuber6 · 2024-12-17T14:58:52Z

llvm/include/llvm/Frontend/Offloading/Utility.h

+namespace intel {
+/// Containerizes an offloading image into the ELF binary format expected by
+/// the Intel runtime offload plugin.
+void containerizeOpenMPSPIRVImage(object::OffloadBinary::OffloadingImage &Img);


This should probably be a separate patch with a unit test.

Sure, will drop this for now and address your other feedback in a separate patch, thanks.

jhuber6 · 2024-12-17T14:59:05Z

llvm/include/llvm/TargetParser/Triple.h

@@ -193,7 +193,8 @@ class Triple {
    Mesa,
    SUSE,
    OpenEmbedded,
-    LastVendorType = OpenEmbedded
+    Intel,


This really needs to be a separate patch.

Will do in #120250, also my bad I noticed I didn't even add a unit test for this here, fixed in new PR.

jhuber6 · 2024-12-17T15:00:14Z

clang/lib/Driver/ToolChains/SPIRVOpenMP.cpp

+using namespace llvm::opt;
+
+namespace clang::driver::toolchains {
+SPIRVOpenMPToolChain::SPIRVOpenMPToolChain(const Driver &D,


Do we truly need a separate OpenMP version of the toolchain? I don't know the details of SPIR-V or Intel's stack. It's relevant if we want OpenMP pulling in different libraries or something, like with AMDGPU's OpenMP skipping some of the HIP libraries.

Right now the only thing we are doing here is pulling in the OpenMP device RTL, but in the future I expect the final version of Intel's OpenMP support to have somewhat complicated logic here pulling in various things, and other vendors could also have some custom stuff, so I think it makes sense to have a new toolchain for now to not bog down the generic SPIR-V toolchain.

jhuber6 · 2024-12-17T15:01:07Z

As there is no production quality SPIR-V linker available, manually create an ELF binary containing the offloading image in a way that fits into the existing liboffload plugin infrastructure. This ELF will eventually be passed to a runtime plugin that interacts with the Intel GPU runtime.

I really wish someone would write one, it would allow me to some day port my libc stuff to SPIR-V.

Signed-off-by: Sarnie, Nick <[email protected]>

sarnex · 2024-12-17T19:24:23Z

Sorry for spam, I hope all feedback so far is addressed in the latest commits.

Signed-off-by: Sarnie, Nick <[email protected]>

sarnex · 2025-01-02T19:26:19Z

@jhuber6 Thanks, if you don't think we need any more reviews do you mind merging? I still don't have push (working on it).
If not, could you please ping other reviewers? Thx

jhuber6 · 2025-01-02T19:31:32Z

@jhuber6 Thanks, if you don't think we need any more reviews do you mind merging? I still don't have push (working on it). If not, could you please ping other reviewers? Thx

Sure, what's left for this to work? I'm probably going to be messing around with the OpenMP 'DeviceRTL' more, likely killing off the 'fatbinary' and just using the per-target runtime dir stuff. I'm going to assume this wouldn't work well with SPIR-V since they don't have a consistent toolchain set up yet. What's we'd need is something like this.

# <install>/lib/spirv64-unknown-intel/libomp.a
$ clang --target=spirv64-unknown-intel -lomp -v
spirv-linker-wrapper -lomp

sarnex · 2025-01-02T20:17:43Z

Sure, what's left for this to work? I'm probably going to be messing around with the OpenMP 'DeviceRTL' more, likely killing off the 'fatbinary' and just using the per-target runtime dir stuff. I'm going to assume this wouldn't work well with SPIR-V since they don't have a consistent toolchain set up yet. What's we'd need is something like this.

If you mean the entire flow, first we need some work in the OMP FE to generate valid OMP SPIR-V (some of the stuff we do in DeviceRTL with specifying the addressspaces explicitly on globals make the OMP FE generate bad IR because it never had to deal with SPIR-V's weird global var addressspace /addrspacecast rules before)

But assuming that works, then yeah we will have to figure out how we want to generate DeviceRTL. I'm not too familiar with the per-target dir stuff, but if the problem is we will have a single RTL for all SPIR-V arches but there will be multiple vendors so the triple won't lead us to the right directory since we only generated one RTL archive for all SPIR-V, then yeah we'll need something special but it should be doable. If I completely whiffed what you were talking about let me know.

After that we need the actual runtime plugin (at least for Intel devices), which we are working on but it's big.

jhuber6 · 2025-01-02T21:21:52Z

Sure, what's left for this to work? I'm probably going to be messing around with the OpenMP 'DeviceRTL' more, likely killing off the 'fatbinary' and just using the per-target runtime dir stuff. I'm going to assume this wouldn't work well with SPIR-V since they don't have a consistent toolchain set up yet. What's we'd need is something like this.

If you mean the entire flow, first we need some work in the OMP FE to generate valid OMP SPIR-V (some of the stuff we do in DeviceRTL with specifying the addressspaces explicitly on globals make the OMP FE generate bad IR because it never had to deal with SPIR-V's weird global var addressspace /addrspacecast rules before)

But assuming that works, then yeah we will have to figure out how we want to generate DeviceRTL. I'm not too familiar with the per-target dir stuff, but if the problem is we will have a single RTL for all SPIR-V arches but there will be multiple vendors so the triple won't lead us to the right directory since we only generated one RTL archive for all SPIR-V, then yeah we'll need something special but it should be doable. If I completely whiffed what you were talking about let me know.

After that we need the actual runtime plugin (at least for Intel devices), which we are working on but it's big.

The vendor should be part of the triple, so realistically we'd have spirv64-unknown-amd or spirv64-unknown-intel.

sarnex · 2025-01-02T21:24:20Z

Sure, what's left for this to work? I'm probably going to be messing around with the OpenMP 'DeviceRTL' more, likely killing off the 'fatbinary' and just using the per-target runtime dir stuff. I'm going to assume this wouldn't work well with SPIR-V since they don't have a consistent toolchain set up yet. What's we'd need is something like this.

If you mean the entire flow, first we need some work in the OMP FE to generate valid OMP SPIR-V (some of the stuff we do in DeviceRTL with specifying the addressspaces explicitly on globals make the OMP FE generate bad IR because it never had to deal with SPIR-V's weird global var addressspace /addrspacecast rules before)
But assuming that works, then yeah we will have to figure out how we want to generate DeviceRTL. I'm not too familiar with the per-target dir stuff, but if the problem is we will have a single RTL for all SPIR-V arches but there will be multiple vendors so the triple won't lead us to the right directory since we only generated one RTL archive for all SPIR-V, then yeah we'll need something special but it should be doable. If I completely whiffed what you were talking about let me know.
After that we need the actual runtime plugin (at least for Intel devices), which we are working on but it's big.

The vendor should be part of the triple, so realistically we'd have spirv64-unknown-amd or spirv64-unknown-intel.

Cool, I don't see any major issues then, just minor stuff I'll have to adapt to.

sarnex added 2 commits December 16, 2024 13:06

clang format

5a93fdf

Signed-off-by: Sarnie, Nick <[email protected]>

fix lit test

9a0a9f3

Signed-off-by: Sarnie, Nick <[email protected]>

sarnex marked this pull request as ready for review December 17, 2024 14:48

llvmbot added clang Clang issues not falling into any other category clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl' backend:SPIR-V labels Dec 17, 2024

jhuber6 reviewed Dec 17, 2024

View reviewed changes

sarnex added 7 commits December 17, 2024 07:52

remove spir-v fix

0557f89

Signed-off-by: Sarnie, Nick <[email protected]>

remove containerization

64228dc

Signed-off-by: Sarnie, Nick <[email protected]>

Merge remote-tracking branch 'upstream/main'

a5b980b

remove --offload-arch changes

1c53aaa

Signed-off-by: Sarnie, Nick <[email protected]>

Merge remote-tracking branch upstream/main

0eb76b4

Signed-off-by: Sarnie, Nick <[email protected]>

missed stuff

ee7ba68

Signed-off-by: Sarnie, Nick <[email protected]>

dead code

261547c

Signed-off-by: Sarnie, Nick <[email protected]>

sarnex added 4 commits December 17, 2024 13:40

remove invalid tests

9c97a92

Signed-off-by: Sarnie, Nick <[email protected]>

Merge remote-tracking branch 'upstream/main'

1d927ee

Signed-off-by: Sarnie, Nick <[email protected]>

fix test after libomptarget change

eb408e9

Signed-off-by: Sarnie, Nick <[email protected]>

format

4764148

Signed-off-by: Sarnie, Nick <[email protected]>

sarnex requested a review from jhuber6 January 2, 2025 15:39

jhuber6 approved these changes Jan 2, 2025

View reviewed changes

jhuber6 merged commit cd19f3f into llvm:main Jan 2, 2025
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[Driver][clang-linker-wrapper] Add initial support for OpenMP offloading to generic SPIR-V #120145

[Driver][clang-linker-wrapper] Add initial support for OpenMP offloading to generic SPIR-V #120145

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