derek.holloway
7502bf64a4
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41 lines
1.3 KiB
LLVM
41 lines
1.3 KiB
LLVM
; RUN: split-file %s %t
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; RUN: opt -module-summary %t/main.ll -o %t.main.o
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; RUN: opt -module-summary %t/empty.ll -o %t.empty.o
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; RUN: wasm-ld --shared-memory %t.main.o %t.empty.o -o %t.wasm
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; RUN: llvm-nm %t.wasm | FileCheck %s
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; This test ensures that when an unused function with target-features="+atomics,+bulk-memory"
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; is stripped during ThinLTO, the resulting empty module does not fall back to generic TargetMachine
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; features and incorrectly omit the atomics/bulk-memory features from the generated custom sections.
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;
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; Since --shared-memory is passed to wasm-ld, `+atomics` and `+bulk-memory` are propagated
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; to the LTO Config via MAttrs, bypassing the functional absence of attributes.
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; CHECK-NOT: error:
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; CHECK: _start
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;--- main.ll
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target triple = "wasm32-unknown-emscripten"
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define void @_start() #0 {
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entry:
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ret void
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}
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attributes #0 = { "target-features"="+atomics,+bulk-memory,+mutable-globals,+sign-ext" }
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;--- empty.ll
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target triple = "wasm32-unknown-emscripten"
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; Thread-local variable that forces generation of TLS layout
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@my_tls = thread_local global i32 42, align 4
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; This function will be removed by dropDeadSymbols because it's unused,
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; taking its target-features attribute block along with it.
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define void @unused() #0 {
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entry:
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ret void
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}
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attributes #0 = { "target-features"="+atomics,+bulk-memory,+mutable-globals,+sign-ext" }
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