8518d12200
In the degenerate case where we wanted to emit {x = x - x} (where {x}
is any register), ia32 and x64 generated wrong code (producing {-x + -x}
instead). Fix this by special casing this case.
R=ahaas@chromium.org
Bug: chromium:919308
Change-Id: I9cd9818d2a678450ac6530107e7a5cbb625ddb8d
Reviewed-on: https://chromium-review.googlesource.com/c/1405029
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58731}
38 lines
1.0 KiB
JavaScript
38 lines
1.0 KiB
JavaScript
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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load('test/mjsunit/wasm/wasm-constants.js');
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load('test/mjsunit/wasm/wasm-module-builder.js');
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const builder = new WasmModuleBuilder();
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builder.addFunction(undefined, kSig_i_i)
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.addLocals({i32_count: 5})
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.addBody([
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kExprGetLocal, 0, // --> 1
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kExprIf, kWasmI32,
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kExprGetLocal, 0, // --> 1
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kExprElse,
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kExprUnreachable,
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kExprEnd,
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kExprIf, kWasmI32,
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kExprGetLocal, 0, // --> 1
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kExprElse,
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kExprUnreachable,
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kExprEnd,
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kExprIf, kWasmI32,
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kExprI32Const, 0,
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kExprGetLocal, 0,
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kExprI32Sub, // --> -1
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kExprGetLocal, 0,
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kExprGetLocal, 0,
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kExprI32Sub, // --> 0
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kExprI32Sub, // --> -1
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kExprElse,
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kExprUnreachable,
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kExprEnd
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]);
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builder.addExport('main', 0);
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const instance = builder.instantiate();
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assertEquals(-1, instance.exports.main(1));
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