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[WebAssembly] Support the new "Lime1" CPU
This adds WebAssembly support for the new [Lime1 CPU]. First, this defines some new target features. These are subsets of existing features that reflect implementation concerns: - "call-indirect-overlong" - implied by "reference-types"; just the overlong encoding for the `call_indirect` immediate, and not the actual reference types. - "bulk-memory-opt" - implied by "bulk-memory": just `memory.copy` and `memory.fill`, and not the other instructions in the bulk-memory proposal. Next, this defines a new target CPU, "lime1", which enables mutable-globals, bulk-memory-opt, multivalue, sign-ext, nontrapping-fptoint, extended-const, and call-indirect-overlong. Unlike the default "generic" CPU, "lime1" is meant to be frozen, and followed up by "lime2" and so on when new features are desired. [Lime1 CPU]: https://github.com/WebAssembly/tool-conventions/blob/main/Lime.md#lime1
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‎clang/docs/ReleaseNotes.rst

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@@ -854,9 +854,15 @@ and `-mbulk-memory` flags, which correspond to the [Bulk Memory Operations]
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and [Non-trapping float-to-int Conversions] language features, which are
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[widely implemented in engines].
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A new Lime1 target CPU is added, -mcpu=lime1. This CPU follows the definition of
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the Lime1 CPU [here], and enables -mmultivalue, -mmutable-globals,
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-mcall-indirect-overlong, -msign-ext, -mbulk-memory-opt, -mnontrapping-fptoint,
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and -mextended-const.
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[Bulk Memory Operations]: https://github.com/WebAssembly/bulk-memory-operations/blob/master/proposals/bulk-memory-operations/Overview.md
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[Non-trapping float-to-int Conversions]: https://github.com/WebAssembly/spec/blob/master/proposals/nontrapping-float-to-int-conversion/Overview.md
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[widely implemented in engines]: https://webassembly.org/features/
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[here]: https://github.com/WebAssembly/tool-conventions/blob/main/Lime.md#lime1
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AVR Support
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^^^^^^^^^^^

‎clang/lib/Basic/Targets/WebAssembly.cpp

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@@ -167,6 +167,17 @@ bool WebAssemblyTargetInfo::initFeatureMap(
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Features["reference-types"] = true;
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Features["sign-ext"] = true;
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};
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auto addLime1Features = [&]() {
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// Lime1:
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// <https://github.com/WebAssembly/tool-conventions/blob/main/Lime.md#lime1>
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Features["multivalue"] = true;
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Features["mutable-globals"] = true;
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Features["call-indirect-overlong"] = true;
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Features["sign-ext"] = true;
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Features["bulk-memory-opt"] = true;
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Features["nontrapping-fptoint"] = true;
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Features["extended-const"] = true;
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};
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auto addBleedingEdgeFeatures = [&]() {
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addGenericFeatures();
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Features["atomics"] = true;
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};
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if (CPU == "generic") {
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addGenericFeatures();
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} else if (CPU == "lime1") {
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addLime1Features();
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} else if (CPU == "bleeding-edge") {
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addBleedingEdgeFeatures();
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}

‎llvm/docs/ReleaseNotes.md

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@@ -221,9 +221,15 @@ and `-mbulk-memory` flags, which correspond to the [Bulk Memory Operations]
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and [Non-trapping float-to-int Conversions] language features, which are
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[widely implemented in engines].
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A new Lime1 target CPU is added, -mcpu=lime1. This CPU follows the definition of
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the Lime1 CPU [here], and enables -mmultivalue, -mmutable-globals,
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-mcall-indirect-overlong, -msign-ext, -mbulk-memory-opt, -mnontrapping-fptoint,
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and -mextended-const.
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[Bulk Memory Operations]: https://github.com/WebAssembly/bulk-memory-operations/blob/master/proposals/bulk-memory-operations/Overview.md
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[Non-trapping float-to-int Conversions]: https://github.com/WebAssembly/spec/blob/master/proposals/nontrapping-float-to-int-conversion/Overview.md
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[widely implemented in engines]: https://webassembly.org/features/
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[here]: https://github.com/WebAssembly/tool-conventions/blob/main/Lime.md#lime1
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Changes to the Windows Target
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-----------------------------

‎llvm/lib/Target/WebAssembly/WebAssembly.td

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@@ -127,6 +127,13 @@ def : ProcessorModel<"generic", NoSchedModel,
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FeatureNontrappingFPToInt, FeatureReferenceTypes,
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FeatureCallIndirectOverlong, FeatureSignExt]>;
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// Lime1: <https://github.com/WebAssembly/tool-conventions/blob/main/Lime.md#lime1>
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def : ProcessorModel<"lime1", NoSchedModel,
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[FeatureMultivalue, FeatureMutableGlobals,
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FeatureCallIndirectOverlong, FeatureSignExt,
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FeatureBulkMemoryOpt, FeatureNontrappingFPToInt,
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FeatureExtendedConst]>;
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// Latest and greatest experimental version of WebAssembly. Bugs included!
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def : ProcessorModel<"bleeding-edge", NoSchedModel,
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[FeatureAtomics, FeatureBulkMemory, FeatureBulkMemoryOpt,

‎llvm/test/CodeGen/WebAssembly/target-features-cpus.ll

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; RUN: llc < %s -mcpu=mvp | FileCheck %s --check-prefixes MVP
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; RUN: llc < %s -mcpu=generic | FileCheck %s --check-prefixes GENERIC
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; RUN: llc < %s -mcpu=lime1 | FileCheck %s --check-prefixes LIME1
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; RUN: llc < %s | FileCheck %s --check-prefixes GENERIC
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; RUN: llc < %s -mcpu=bleeding-edge | FileCheck %s --check-prefixes BLEEDING-EDGE
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; GENERIC-NEXT: .int8 8
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; GENERIC-NEXT: .ascii "sign-ext"
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; lime1: +bulk-memory-opt, +call-indirect-overlong, +extended-const, +multivalue,
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; +mutable-globals, +nontrapping-fptoint, +sign-ext
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; LIME1-LABEL: .custom_section.target_features,"",@
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; LIME1-NEXT: .int8 7
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 15
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; LIME1-NEXT: .ascii "bulk-memory-opt"
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 22
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; LIME1-NEXT: .ascii "call-indirect-overlong"
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 14
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; LIME1-NEXT: .ascii "extended-const"
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 10
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; LIME1-NEXT: .ascii "multivalue"
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 15
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; LIME1-NEXT: .ascii "mutable-globals"
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 19
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; LIME1-NEXT: .ascii "nontrapping-fptoint"
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; LIME1-NEXT: .int8 43
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; LIME1-NEXT: .int8 8
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; LIME1-NEXT: .ascii "sign-ext"
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; bleeding-edge: +atomics, +bulk-memory, +bulk-memory-opt,
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; +call-indirect-overlong, +exception-handling,
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; +extended-const, +fp16, +multimemory, +multivalue,

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