[WebAssembly] Fix CPU tests in wasm-features.c #80900

aheejin · 2024-02-06T19:35:34Z

The CPU tests in this file are not working as intended. Specifying -mcpu=[mvp|generic|bleeding-edge] in clang command line does NOT add arguments like -target-feature, +feature-name, ... to clang-14 command line. Specifying -mcpu=[mvp|generic|bleeding-edge] in clang command line will just add -target-cpu [mvp|generic|bleeding-edge] to clang-14 command line, and individual features are added here within clang-14 invocation:

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

Lines 150 to 163 in 5b780c8

    
           if (CPU == "bleeding-edge") { 
        
             Features["nontrapping-fptoint"] = true; 
        
             Features["sign-ext"] = true; 
        
             Features["bulk-memory"] = true; 
        
             Features["atomics"] = true; 
        
             Features["mutable-globals"] = true; 
        
             Features["tail-call"] = true; 
        
             Features["reference-types"] = true; 
        
             Features["multimemory"] = true; 
        
             setSIMDLevel(Features, SIMD128, true); 
        
           } else if (CPU == "generic") { 
        
             Features["sign-ext"] = true; 
        
             Features["mutable-globals"] = true; 
        
           }

The reason these CPU tests are passing is because they only have -NOT checks, and we don't emit -target-feature arguments for them anyway, the test passes, but they don't check what they are supposed to check.

This make CPU tests only check -target-cpu lines instead of individual features, which will not be emitted.

This test is not working as intended. Specifying `-mcpu=[mvp|generic|bleeding-edge]` in `clang` command line does NOT add arguments like `-target-feature`, `+feature-name`, ... to `clang-14` command line. Specifying `-mcpu=[mvp|generic|bleeding-edge]` in `clang` command line will just add `-target-cpu=[mvp|generic|bleeding-edge]` to `clang-14` command line, and individual features are added here within `clang-14` invocation: https://github.com/llvm/llvm-project/blob/5b780c8c6c558ec283a9eec485a4f172df0f9fe1/clang/lib/Basic/Targets/WebAssembly.cpp#L150-L163 So the `wasm-features.c` test is not working as intended. The reason it is passing is because it only has `-NOT` checks, and we don't emit `-target-feature` arguments anyway, the test passes, but it doesn't check what it is supposed to check. I think we can delete this test. Features enabled by each CPU is also tested in https://github.com/llvm/llvm-project/blob/main/clang/test/Preprocessor/wasm-target-features.c, so I think this is covered.

llvmbot · 2024-02-06T19:36:07Z

@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-clang

Author: Heejin Ahn (aheejin)

Changes

This test is not working as intended. Specifying -mcpu=[mvp|generic|bleeding-edge] in clang command line does NOT add arguments like -target-feature, +feature-name, ... to clang-14 command line. Specifying -mcpu=[mvp|generic|bleeding-edge] in clang command line will just add -target-cpu=[mvp|generic|bleeding-edge] to clang-14 command line, and individual features are added here within clang-14 invocation:

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

Lines 150 to 163 in 5b780c8

    
           if (CPU == "bleeding-edge") { 
        
             Features["nontrapping-fptoint"] = true; 
        
             Features["sign-ext"] = true; 
        
             Features["bulk-memory"] = true; 
        
             Features["atomics"] = true; 
        
             Features["mutable-globals"] = true; 
        
             Features["tail-call"] = true; 
        
             Features["reference-types"] = true; 
        
             Features["multimemory"] = true; 
        
             setSIMDLevel(Features, SIMD128, true); 
        
           } else if (CPU == "generic") { 
        
             Features["sign-ext"] = true; 
        
             Features["mutable-globals"] = true; 
        
           }

So the wasm-features.c test is not working as intended. The reason it is passing is because it only has -NOT checks, and we don't emit -target-feature arguments anyway, the test passes, but it doesn't check what it is supposed to check.

I think we can delete this test. Features enabled by each CPU is also tested in
https://github.com/llvm/llvm-project/blob/main/clang/test/Preprocessor/wasm-target-features.c, so I think this is covered.

Full diff: https://github.com/llvm/llvm-project/pull/80900.diff

1 Files Affected:

(removed) clang/test/Driver/wasm-features.c (-132)

diff --git a/clang/test/Driver/wasm-features.c b/clang/test/Driver/wasm-features.c
deleted file mode 100644
index 4fba3da7bea267..00000000000000
--- a/clang/test/Driver/wasm-features.c
+++ /dev/null
@@ -1,132 +0,0 @@
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -fsyntax-only 2>&1 | FileCheck %s
-
-// CHECK: "-fvisibility=hidden"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s 2>&1 | FileCheck %s -check-prefix=DEFAULT
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mcpu=mvp 2>&1 | FileCheck %s -check-prefix=MVP
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mcpu=bleeding-edge 2>&1 | FileCheck %s -check-prefix=BLEEDING-EDGE
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mbulk-memory 2>&1 | FileCheck %s -check-prefix=BULK-MEMORY
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-bulk-memory 2>&1 | FileCheck %s -check-prefix=NO-BULK-MEMORY
-
-// BULK-MEMORY: "-target-feature" "+bulk-memory"
-// NO-BULK-MEMORY: "-target-feature" "-bulk-memory"
-// DEFAULT-NOT: "-target-feature" "-bulk-memory"
-// MVP-NOT: "-target-feature" "+bulk-memory"
-// BLEEDING-EDGE-NOT: "-target-feature" "-bulk-memory"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mmutable-globals 2>&1 | FileCheck %s -check-prefix=MUTABLE-GLOBALS
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-mutable-globals 2>&1 | FileCheck %s -check-prefix=NO-MUTABLE-GLOBALS
-
-// MUTABLE-GLOBALS: "-target-feature" "+mutable-globals"
-// NO-MUTABLE-GLOBALS: "-target-feature" "-mutable-globals"
-// DEFAULT-NOT: "-target-feature" "-mutable-globals"
-// MVP-NOT: "-target-feature" "+mutable-globals"
-// BLEEDING-EDGE-NOT: "-target-feature" "-mutable-globals"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -msign-ext 2>&1 | FileCheck %s -check-prefix=SIGN-EXT
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-sign-ext 2>&1 | FileCheck %s -check-prefix=NO-SIGN-EXT
-
-// SIGN-EXT: "-target-feature" "+sign-ext"
-// NO-SIGN-EXT: "-target-feature" "-sign-ext"
-// DEFAULT-NOT: "-target-feature" "-sign-ext"
-// MVP-NOT: "-target-feature" "+sign-ext"
-// BLEEDING-EDGE-NOT: "-target-feature" "-sign-ext"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mnontrapping-fptoint 2>&1 | FileCheck %s -check-prefix=NONTRAPPING-FPTOINT
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-nontrapping-fptoint 2>&1 | FileCheck %s -check-prefix=NO-NONTRAPPING-FPTOINT
-
-// NONTRAPPING-FPTOINT: "-target-feature" "+nontrapping-fptoint"
-// NO-NONTRAPPING-FPTOINT: "-target-feature" "-nontrapping-fptoint"
-// DEFAULT-NOT: "-target-feature" "-nontrapping-fptoint"
-// MVP-NOT: "-target-feature" "+nontrapping-fptoint"
-// BLEEDING-EDGE-NOT: "-target-feature" "-nontrapping-fptoint"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mmultivalue 2>&1 | FileCheck %s -check-prefix=MULTIVALUE
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-multivalue 2>&1 | FileCheck %s -check-prefix=NO-MULTIVALUE
-
-// MULTIVALUE: "-target-feature" "+multivalue"
-// NO-MULTIVALUE: "-target-feature" "-multivalue"
-// DEFAULT-NOT: "-target-feature" "-multivalue"
-// MVP-NOT: "-target-feature" "+multivalue"
-// GENERIC-NOT: "-target-feature" "+multivalue"
-// BLEEDING-EDGE-NOT: "-target-feature" "-multivalue"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mmultimemory 2>&1 | FileCheck %s -check-prefix=MULTIMEMORY
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-multimemory 2>&1 | FileCheck %s -check-prefix=NO-MULTIMEMORY
-
-// MULTIMEMORY: "-target-feature" "+multimemory"
-// NO-MULTIMEMORY: "-target-feature" "-multimemory"
-// DEFAULT-NOT: "-target-feature" "-multimemory"
-// MVP-NOT: "-target-feature" "+multimemory"
-// BLEEDING-EDGE-NOT: "-target-feature" "-multimemory"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -matomics 2>&1 | FileCheck %s -check-prefix=ATOMICS
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-atomics 2>&1 | FileCheck %s -check-prefix=NO-ATOMICS
-
-// ATOMICS: "-target-feature" "+atomics"
-// NO-ATOMICS: "-target-feature" "-atomics"
-// DEFAULT-NOT: "-target-feature" "-atomics"
-// MVP-NOT: "-target-feature" "+atomics"
-// GENERIC-NOT: "-target-feature" "+atomics"
-// BLEEDING-EDGE-NOT: "-target-feature" "-atomics"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mtail-call 2>&1 | FileCheck %s -check-prefix=TAIL-CALL
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-tail-call 2>&1 | FileCheck %s -check-prefix=NO-TAIL-CALL
-
-// TAIL-CALL: "-target-feature" "+tail-call"
-// NO-TAIL-CALL: "-target-feature" "-tail-call"
-// DEFAULT-NOT: "-target-feature" "-tail-call"
-// MVP-NOT: "-target-feature" "+tail-call"
-// GENERIC-NOT: "-target-feature" "+tail-call"
-// BLEEDING-EDGE-NOT: "-target-feature" "-tail-call"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mreference-types 2>&1 | FileCheck %s -check-prefix=REFERENCE-TYPES
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-reference-types 2>&1 | FileCheck %s -check-prefix=NO-REFERENCE-TYPES
-
-// REFERENCE-TYPES: "-target-feature" "+reference-types"
-// NO-REFERENCE-TYPES: "-target-feature" "-reference-types"
-// DEFAULT-NOT: "-target-feature" "-reference-types"
-// MVP-NOT: "-target-feature" "+reference-types"
-// GENERIC-NOT: "-target-feature" "+reference-types"
-// BLEEDING-EDGE-NOT: "-target-feature" "-reference-types"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -msimd128 2>&1 | FileCheck %s -check-prefix=SIMD128
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-simd128 2>&1 | FileCheck %s -check-prefix=NO-SIMD128
-
-// SIMD128: "-target-feature" "+simd128"
-// NO-SIMD128: "-target-feature" "-simd128"
-// DEFAULT-NOT: "-target-feature" "-simd128"
-// MVP-NOT: "-target-feature" "+simd128"
-// GENERIC-NOT: "-target-feature" "+simd128"
-// BLEEDING-EDGE-NOT: "-target-feature" "+simd128"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mrelaxed-simd 2>&1 | FileCheck %s -check-prefix=RELAXED-SIMD
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-relaxed-simd 2>&1 | FileCheck %s -check-prefix=NO-RELAXED-SIMD
-
-// RELAXED-SIMD: "-target-feature" "+relaxed-simd"
-// NO-RELAXED-SIMD: "-target-feature" "-relaxed-simd"
-// DEFAULT-NOT: "-target-feature" "-relaxed-simd"
-// MVP-NOT: "-target-feature" "+relaxed-simd"
-// GENERIC-NOT: "-target-feature" "+relaxed-simd"
-// BLEEDING-EDGE-NOT: "-target-feature" "+relaxed-simd"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mexception-handling 2>&1 | FileCheck %s -check-prefix=EXCEPTION-HANDLING
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-exception-handling 2>&1 | FileCheck %s -check-prefix=NO-EXCEPTION-HANDLING
-
-// EXCEPTION-HANDLING: "-target-feature" "+exception-handling"
-// NO-EXCEPTION-HANDLING: "-target-feature" "-exception-handling"
-// DEFAULT-NOT: "-target-feature" "-exception-handling"
-// MVP-NOT: "-target-feature" "+exception-handling"
-// GENERIC-NOT: "-target-feature" "+exception-handling"
-// BLEEDING-EDGE-NOT: "-target-feature" "+exception-handling"
-
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mextended-const 2>&1 | FileCheck %s -check-prefix=EXTENDED-CONST
-// RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-extended-const 2>&1 | FileCheck %s -check-prefix=NO-EXTENDED-CONST
-
-// EXTENDED-CONST: "-target-feature" "+extended-const"
-// NO-EXTENDED-CONST: "-target-feature" "-extended-const"
-// DEFAULT-NOT: "-target-feature" "-extended-const"
-// MVP-NOT: "-target-feature" "+extended-const"
-// GENERIC-NOT: "-target-feature" "+extended-const"
-// BLEEDING-EDGE-NOT: "-target-feature" "+extended-const"

tlively · 2024-02-06T19:56:21Z

The reason it is passing is because it only has -NOT checks

This doesn't look right, though. There are plenty of positive checks in the file, so how could it be passing if it's not checking the right things?

aheejin · 2024-02-06T19:58:35Z

Sorry, I was confused. Enabling individual features with -mfeature-name to clang adds -target-feature feature-name to the clang-14 as intended. Only the -mcpu tests were not working as intended. I think I need to only delete the parts that test CPUs instead.

aheejin · 2024-02-06T20:13:56Z

Hmm, on second thought, I think it'd be better to test -target-cpu lines instead than deleting the whole thing. Sorry for the flip-flopping.

tlively

This makes sense, thanks!

aheejin requested review from sunfishcode and tlively February 6, 2024 19:35

llvmbot added clang Clang issues not falling into any other category clang:driver 'clang' and 'clang++' user-facing binaries. Not 'clang-cl' labels Feb 6, 2024

Re-add wasm-features.c

7913e2f

aheejin changed the title ~~[WebAssembly] Remove wasm-features.c test~~ [WebAssembly] Remove CPU tests from wasm-features.c Feb 6, 2024

aheejin mentioned this pull request Feb 6, 2024

[WebAssembly] Cleanup feature tests #80780

Merged

Re-add modified CPU tests

c492bca

aheejin changed the title ~~[WebAssembly] Remove CPU tests from wasm-features.c~~ [WebAssembly] Fix CPU tests from wasm-features.c Feb 6, 2024

aheejin changed the title ~~[WebAssembly] Fix CPU tests from wasm-features.c~~ [WebAssembly] Fix CPU tests in wasm-features.c Feb 6, 2024

tlively approved these changes Feb 6, 2024

View reviewed changes

aheejin merged commit 897297e into llvm:main Feb 7, 2024
4 checks passed

aheejin deleted the remove_feature_test branch February 7, 2024 01:07

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[WebAssembly] Fix CPU tests in wasm-features.c #80900

[WebAssembly] Fix CPU tests in wasm-features.c #80900

aheejin commented Feb 6, 2024 •

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tlively commented Feb 6, 2024

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	if (CPU == "bleeding-edge") {
	Features["nontrapping-fptoint"] = true;
	Features["sign-ext"] = true;
	Features["bulk-memory"] = true;
	Features["atomics"] = true;
	Features["mutable-globals"] = true;
	Features["tail-call"] = true;
	Features["reference-types"] = true;
	Features["multimemory"] = true;
	setSIMDLevel(Features, SIMD128, true);
	} else if (CPU == "generic") {
	Features["sign-ext"] = true;
	Features["mutable-globals"] = true;
	}

[WebAssembly] Fix CPU tests in wasm-features.c #80900

[WebAssembly] Fix CPU tests in wasm-features.c #80900

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