[WebAssembly] Update generic and bleeding-edge CPUs #96584

aheejin · 2024-06-25T02:26:10Z

This updates the list of features in 'generic' and 'bleeding-edge' CPUs in the backend to match

llvm-project/clang/lib/Basic/Targets/WebAssembly.cpp

Lines 150 to 178 in 4e0a0ea

    
           bool WebAssemblyTargetInfo::initFeatureMap( 
        
               llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU, 
        
               const std::vector<std::string> &FeaturesVec) const { 
        
             auto addGenericFeatures = [&]() { 
        
               Features["multivalue"] = true; 
        
               Features["mutable-globals"] = true; 
        
               Features["reference-types"] = true; 
        
               Features["sign-ext"] = true; 
        
             }; 
        
             auto addBleedingEdgeFeatures = [&]() { 
        
               addGenericFeatures(); 
        
               Features["atomics"] = true; 
        
               Features["bulk-memory"] = true; 
        
               Features["exception-handling"] = true; 
        
               Features["extended-const"] = true; 
        
               Features["half-precision"] = true; 
        
               Features["multimemory"] = true; 
        
               Features["nontrapping-fptoint"] = true; 
        
               Features["tail-call"] = true; 
        
               setSIMDLevel(Features, RelaxedSIMD, true); 
        
             }; 
        
             if (CPU == "generic") { 
        
               addGenericFeatures(); 
        
             } else if (CPU == "bleeding-edge") { 
        
               addBleedingEdgeFeatures(); 
        
             } 
        
             return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec); 
        
           }

This updates existing CodeGen tests in a way that, if a test has separate RUN lines for a reference-types test and a non-reference-types test, I added -mattr=-reference-types to the no-reftype test's RUN command line. I didn't delete existing -mattr=+reference-types lines in reftype tests because having it helps readability.

Also, when tests is not really about reference-types but they have to updated because they happen to contain call_indirect lines because now call_indirect will take __indirect_function_table as an argument, I just added the table argument to the expected output.

target-features-cpus.ll has been updated reflecting the newly added features.

This updates the list of features in 'generic' and 'bleeding-edge' CPUs in the backend to match https://github.com/llvm/llvm-project/blob/4e0a0eae58f7a6998866719f7eb970096a2a52e9/clang/lib/Basic/Targets/WebAssembly.cpp#L150-L175. It is hard to add a backend test for this, given that we don't have a convenient way of testing the list of features included in each cpu like the preprocessor test in Clang: https://github.com/llvm/llvm-project/blob/4e0a0eae58f7a6998866719f7eb970096a2a52e9/clang/test/Preprocessor/wasm-target-features.c#L158-L208 And the current features for 'generic' and 'bleeding-edge' don't have a separate backend test anyway.

llvmbot · 2024-06-25T02:26:42Z

@llvm/pr-subscribers-mc

@llvm/pr-subscribers-backend-webassembly

Author: Heejin Ahn (aheejin)

Changes

This updates the list of features in 'generic' and 'bleeding-edge' CPUs in the backend to match

llvm-project/clang/lib/Basic/Targets/WebAssembly.cpp

Lines 150 to 175 in 4e0a0ea

    
           bool WebAssemblyTargetInfo::initFeatureMap( 
        
               llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU, 
        
               const std::vector<std::string> &FeaturesVec) const { 
        
             auto addGenericFeatures = [&]() { 
        
               Features["multivalue"] = true; 
        
               Features["mutable-globals"] = true; 
        
               Features["reference-types"] = true; 
        
               Features["sign-ext"] = true; 
        
             }; 
        
             auto addBleedingEdgeFeatures = [&]() { 
        
               addGenericFeatures(); 
        
               Features["atomics"] = true; 
        
               Features["bulk-memory"] = true; 
        
               Features["exception-handling"] = true; 
        
               Features["extended-const"] = true; 
        
               Features["half-precision"] = true; 
        
               Features["multimemory"] = true; 
        
               Features["nontrapping-fptoint"] = true; 
        
               Features["tail-call"] = true; 
        
               setSIMDLevel(Features, RelaxedSIMD, true); 
        
             }; 
        
             if (CPU == "generic") { 
        
               addGenericFeatures(); 
        
             } else if (CPU == "bleeding-edge") { 
        
               addBleedingEdgeFeatures(); 
        
             }

.

It is hard to add a backend test for this, given that we don't have a convenient way of testing the list of features included in each cpu like the preprocessor test in Clang:

llvm-project/clang/test/Preprocessor/wasm-target-features.c

Lines 158 to 208 in 4e0a0ea

    
           // RUN: %clang -E -dM %s -o - 2>&1 \ 
        
           // RUN:     -target wasm32-unknown-unknown -mcpu=generic \ 
        
           // RUN:   | FileCheck %s -check-prefix=GENERIC-INCLUDE 
        
           // RUN: %clang -E -dM %s -o - 2>&1 \ 
        
           // RUN:     -target wasm64-unknown-unknown -mcpu=generic \ 
        
           // RUN:   | FileCheck %s -check-prefix=GENERIC-INCLUDE 
        
           // 
        
           // GENERIC-INCLUDE-DAG: #define __wasm_multivalue__ 1{{$}} 
        
           // GENERIC-INCLUDE-DAG: #define __wasm_mutable_globals__ 1{{$}} 
        
           // GENERIC-INCLUDE-DAG: #define __wasm_reference_types__ 1{{$}} 
        
           // GENERIC-INCLUDE-DAG: #define __wasm_sign_ext__ 1{{$}} 
        
           // 
        
           // RUN: %clang -E -dM %s -o - 2>&1 \ 
        
           // RUN:     -target wasm32-unknown-unknown -mcpu=generic \ 
        
           // RUN:   | FileCheck %s -check-prefix=GENERIC 
        
           // RUN: %clang -E -dM %s -o - 2>&1 \ 
        
           // RUN:     -target wasm64-unknown-unknown -mcpu=generic \ 
        
           // RUN:   | FileCheck %s -check-prefix=GENERIC 
        
           // 
        
           // GENERIC-NOT: #define __wasm_atomics__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_bulk_memory__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_exception_handling__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_extended_const__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_half_precision__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_multimemory__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_nontrapping_fptoint__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_relaxed_simd__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_simd128__ 1{{$}} 
        
           // GENERIC-NOT: #define __wasm_tail_call__ 1{{$}} 
        
           // RUN: %clang -E -dM %s -o - 2>&1 \ 
        
           // RUN:     -target wasm32-unknown-unknown -mcpu=bleeding-edge \ 
        
           // RUN:   | FileCheck %s -check-prefix=BLEEDING-EDGE-INCLUDE 
        
           // RUN: %clang -E -dM %s -o - 2>&1 \ 
        
           // RUN:     -target wasm64-unknown-unknown -mcpu=bleeding-edge \ 
        
           // RUN:   | FileCheck %s -check-prefix=BLEEDING-EDGE-INCLUDE 
        
           // 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_atomics__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_bulk_memory__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_exception_handling__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_extended_const__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_half_precision__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_multimemory__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_multivalue__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_mutable_globals__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_nontrapping_fptoint__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_reference_types__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_relaxed_simd__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_sign_ext__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_simd128__ 1{{$}} 
        
           // BLEEDING-EDGE-INCLUDE-DAG: #define __wasm_tail_call__ 1{{$}}

And the current features for 'generic' and 'bleeding-edge' don't have a separate backend test anyway.

Full diff: https://github.com/llvm/llvm-project/pull/96584.diff

1 Files Affected:

(modified) llvm/lib/Target/WebAssembly/WebAssembly.td (+8-4)

diff --git a/llvm/lib/Target/WebAssembly/WebAssembly.td b/llvm/lib/Target/WebAssembly/WebAssembly.td
index 0dd674426e9e8..97618617ff82f 100644
--- a/llvm/lib/Target/WebAssembly/WebAssembly.td
+++ b/llvm/lib/Target/WebAssembly/WebAssembly.td
@@ -110,13 +110,17 @@ def : ProcessorModel<"mvp", NoSchedModel, []>;
 // consideration given to available support in relevant engines and tools, and
 // the importance of the features.
 def : ProcessorModel<"generic", NoSchedModel,
-                      [FeatureSignExt, FeatureMutableGlobals]>;
+                      [FeatureMultivalue, FeatureMutableGlobals,
+                       FeatureReferenceTypes, FeatureSignExt]>;
 
 // Latest and greatest experimental version of WebAssembly. Bugs included!
 def : ProcessorModel<"bleeding-edge", NoSchedModel,
-                      [FeatureSIMD128, FeatureAtomics,
-                       FeatureNontrappingFPToInt, FeatureSignExt,
-                       FeatureMutableGlobals, FeatureBulkMemory,
+                      [FeatureAtomics, FeatureBulkMemory,
+                       FeatureExceptionHandling, FeatureExtendedConst,
+                       FeatureHalfPrecision, FeatureMultiMemory,
+                       FeatureMultivalue, FeatureMutableGlobals,
+                       FeatureNontrappingFPToInt, FeatureRelaxedSIMD,
+                       FeatureReferenceTypes, FeatureSIMD128, FeatureSignExt,
                        FeatureTailCall]>;
 
 //===----------------------------------------------------------------------===//

tlively

LGTM!

aheejin · 2024-06-25T22:09:05Z

Sorry, apparently there are tests to be updated 😅

3186ad7 updates tests in a way that, if a test has separate RUN lines for a reference-types test and a non-reference-types test, I added -mattr=-reference-types to the no-reftype test's RUN command line. I didn't delete existing -mattr=+reference-types lines in reftype tests because having it helps readability.

Also, when tests is not really about reference-types but they have to updated because they happen to contain call_indirect lines because now call_indirect will take __indirect_function_table as an argument, I just added the table argument to the expected output.

I think https://github.com/llvm/llvm-project/blob/main/llvm/test/CodeGen/WebAssembly/target-features.ll better be updated separately... Will upload a PR for that and land this after that one lands.

tlively · 2024-06-25T22:20:34Z

Test changes so far look good 👍

aheejin · 2024-07-02T02:11:55Z

Will land this; please let me know if you have any other comments.

This updates the list of features in 'generic' and 'bleeding-edge' CPUs in the backend to match https://github.com/llvm/llvm-project/blob/4e0a0eae58f7a6998866719f7eb970096a2a52e9/clang/lib/Basic/Targets/WebAssembly.cpp#L150-L178 This updates existing CodeGen tests in a way that, if a test has separate RUN lines for a reference-types test and a non-reference-types test, I added -mattr=-reference-types to the no-reftype test's RUN command line. I didn't delete existing -mattr=+reference-types lines in reftype tests because having it helps readability. Also, when tests is not really about reference-types but they have to updated because they happen to contain call_indirect lines because now call_indirect will take __indirect_function_table as an argument, I just added the table argument to the expected output. `target-features-cpus.ll` has been updated reflecting the newly added features.

CryZe · 2024-10-18T09:34:18Z

Some feedback: This broke the majority of the JavaScript bundlers (webpack and co.) which are commonly built on top of webassemblyjs which is very unmaintained and does not support reference-types. I'm not sure, but it may be worth reverting.

dschuff · 2024-10-18T15:50:38Z

Can you say more about what the bundlers are doing, and how they are doing it?
I don't want to be breaking people, but also we surely can't freeze LLVM forever just because some other tool is unmaintained. We are actually planning to enable bulk memory and nontrapping-fptoint soon as well.

dschuff · 2024-10-18T16:12:53Z

Interestingly, it looks like the decoder in webassemblyjs already decodes the table index as an LEB.

dschuff · 2024-10-18T16:13:49Z

actually... sorry, let's have this conversation on WebAssembly/tool-conventions#233 rather than forking it here.

aheejin requested a review from tlively June 25, 2024 02:26

llvmbot added the backend:WebAssembly label Jun 25, 2024

aheejin mentioned this pull request Jun 25, 2024

Enabling features by default in LLVM WebAssembly/tool-conventions#158

Closed

tlively approved these changes Jun 25, 2024

View reviewed changes

Update tests

3186ad7

llvmbot added the llvm:mc Machine (object) code label Jun 25, 2024

aheejin marked this pull request as draft June 25, 2024 22:09

aheejin added 2 commits June 26, 2024 20:34

Merge branch 'main' into llc_default

cc2ca1b

Update target-features-cpus.ll

8898c98

aheejin marked this pull request as ready for review June 26, 2024 20:35

Update feature names in target-features-cpus.ll

a0d71f8

aheejin merged commit fb6e024 into llvm:main Jul 2, 2024

aheejin deleted the llc_default branch July 2, 2024 02:12

alexcrichton mentioned this pull request Aug 20, 2024

LLVM 19 and enabling reference-types by default WebAssembly/tool-conventions#233

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[WebAssembly] Update generic and bleeding-edge CPUs #96584

[WebAssembly] Update generic and bleeding-edge CPUs #96584

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	bool WebAssemblyTargetInfo::initFeatureMap(
	llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
	const std::vector<std::string> &FeaturesVec) const {
	auto addGenericFeatures = [&]() {
	Features["multivalue"] = true;
	Features["mutable-globals"] = true;
	Features["reference-types"] = true;
	Features["sign-ext"] = true;
	};
	auto addBleedingEdgeFeatures = [&]() {
	addGenericFeatures();
	Features["atomics"] = true;
	Features["bulk-memory"] = true;
	Features["exception-handling"] = true;
	Features["extended-const"] = true;
	Features["half-precision"] = true;
	Features["multimemory"] = true;
	Features["nontrapping-fptoint"] = true;
	Features["tail-call"] = true;
	setSIMDLevel(Features, RelaxedSIMD, true);
	};
	if (CPU == "generic") {
	addGenericFeatures();
	} else if (CPU == "bleeding-edge") {
	addBleedingEdgeFeatures();
	}

	return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
	}

[WebAssembly] Update generic and bleeding-edge CPUs #96584

[WebAssembly] Update generic and bleeding-edge CPUs #96584

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