70a389ac87
The register that holds the {new_value} for the AtomicCompareExchange8U
has to be a byte register on ia32. There was code to guarantee that, but
after that code there was code that frees the {eax} register, and that
code moved the {new_value} to a different register again. With this CL
we first free {eax}, and then find a byte register for the {new_value}.
R=clemensb@chromium.org
Bug: chromium:1140549
Change-Id: I1679f3f9ab26c5416ea251c7925366ff43336d85
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2491031
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70721}
26 lines
727 B
JavaScript
26 lines
727 B
JavaScript
// Copyright 2020 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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// Flags: --wasm-staging
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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.addMemory(16, 32, false, true);
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builder.addType(makeSig([], []));
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builder.addFunction(undefined, 0 /* sig */)
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.addBodyWithEnd([
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// signature: v_v
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// body:
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kExprI32Const, 0x00,
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kExprI32Const, 0x00,
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kExprI32Const, 0x00,
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kAtomicPrefix, kExprI32AtomicCompareExchange8U, 0x00, 0xc3, 0x01,
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kExprDrop,
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kExprEnd, // end @193
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]);
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builder.addExport('main', 0);
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const instance = builder.instantiate();
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print(instance.exports.main(1, 2, 3));
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