[SYCL][ESIMD] Rework -O0 behavior #12612
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sarnex
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✅ With the latest revision this PR passed the C/C++ code formatter. |
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
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Linux Gen12 failure is not related, failing everywhere: |
| @@ -955,6 +955,8 @@ void EmitAssemblyHelper::RunOptimizationPipeline( | |||
| PB.registerPipelineStartEPCallback([&](ModulePassManager &MPM, | |||
| OptimizationLevel Level) { | |||
| MPM.addPass(ESIMDVerifierPass(LangOpts.SYCLESIMDForceStatelessMem)); | |||
| if (Level == OptimizationLevel::O0) | |||
| MPM.addPass(ESIMDRemoveOptnoneNoinlinePass()); | |||
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I am okay with this ESIMD change.
premanandrao
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Feb 14, 2024
mdtoguchi
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Feb 16, 2024
smanna12
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Feb 16, 2024
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@intel/dpcpp-esimd-reviewers @intel/dpcpp-tools-reviewers Ping, thanks! |
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
v-klochkov
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Feb 28, 2024
| @@ -1834,6 +1834,15 @@ bool SYCLLowerESIMDPass::prepareForAlwaysInliner(Module &M) { | |||
| continue; | |||
| } | |||
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| // If we are splitting by ESIMD, we are guarenteed the entire | |||
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Is this code still needed after adding the special pass that remove those 2 attributes?
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Yes, I tested many combinations of with/without different changes in this PR and everything we currently have is required.
sarnex
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sarnex
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v-klochkov
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Feb 28, 2024
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Windows fail is not related |
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Let me first say I don't like this change and I wish we didn't have to do this, and it should only be temporary.
The root need is that the IGC VC backend does not support O0 code. It gets miscompiled and produces wrong answers and crashes. The team acknowledges this issue but does not have the resources to fix this at the moment.
From the ESIMD user POV, this is really frustrating. We decided it would be okay if they lost debuggability of device code (but retained it for host code) as long as their program runs and they get the right answer.
So the overall approach is to optimize ESIMD(Not SYCL!!) code even in O0 mode. We are actually already doing this, but this change extends it a bit.
So there are a few main changes in this PR:
-O0tosycl-post-link. Note this option has absolutely no effect on SYCL code today, it is only checked in the ESIMD lowering code insycl-post-link.optnone/noinlineearly for ESIMD code inO0.optnone/noinlinefrom all functions if we split out ESIMD/SYCL code, and if we don't don't touch it.All three of these steps are required to fix the tests failing with
O0, if we remove any one of them we see many failures.When running all ESIMD tests with
O0, we see the following improvements:Once IGC VC can actually correctly compile non-optimized code, we should revert this change.