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086791eca2
One unusual feature of the z architecture is that the result of a previous load can be reused indefinitely for subsequent loads, even if a cache-coherent store to that location is performed by another CPU. A special serializing instruction must be used if you want to force a load to be reattempted. Since volatile loads are not supposed to be omitted in this way, we should insert a serializing instruction before each such load. The same goes for atomic loads. The patch implements this at the IR->DAG boundary, in a similar way to atomic fences. It is a no-op for targets other than SystemZ. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196905 91177308-0d34-0410-b5e6-96231b3b80d8
52 lines
1.8 KiB
TableGen
52 lines
1.8 KiB
TableGen
//===-- SystemZ.td - SystemZ processors and features ---------*- tblgen -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Processor and feature definitions.
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//
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//===----------------------------------------------------------------------===//
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class SystemZFeature<string extname, string intname, string desc>
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: Predicate<"Subtarget.has"##intname##"()">,
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AssemblerPredicate<"Feature"##intname, extname>,
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SubtargetFeature<extname, "Has"##intname, "true", desc>;
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def FeatureDistinctOps : SystemZFeature<
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"distinct-ops", "DistinctOps",
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"Assume that the distinct-operands facility is installed"
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>;
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def FeatureLoadStoreOnCond : SystemZFeature<
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"load-store-on-cond", "LoadStoreOnCond",
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"Assume that the load/store-on-condition facility is installed"
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>;
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def FeatureHighWord : SystemZFeature<
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"high-word", "HighWord",
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"Assume that the high-word facility is installed"
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>;
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def FeatureFPExtension : SystemZFeature<
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"fp-extension", "FPExtension",
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"Assume that the floating-point extension facility is installed"
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>;
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def FeatureFastSerialization : SystemZFeature<
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"fast-serialization", "FastSerialization",
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"Assume that the fast-serialization facility is installed"
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>;
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def : Processor<"generic", NoItineraries, []>;
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def : Processor<"z10", NoItineraries, []>;
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def : Processor<"z196", NoItineraries,
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[FeatureDistinctOps, FeatureLoadStoreOnCond, FeatureHighWord,
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FeatureFPExtension, FeatureFastSerialization]>;
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def : Processor<"zEC12", NoItineraries,
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[FeatureDistinctOps, FeatureLoadStoreOnCond, FeatureHighWord,
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FeatureFPExtension, FeatureFastSerialization]>;
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