3eded2c06c
The current usage of this runtime function is broken as it does not prevent inlining of the affected function but rather bails out from the whole unit of compilation after trying to inline affected functions. This simplifies said runtime function to avoid accidental misuse. R=titzer@chromium.org TEST=mjsunit/never-optimize Review URL: https://codereview.chromium.org/19776006 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15762 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
89 lines
3.0 KiB
JavaScript
89 lines
3.0 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --allow-natives-syntax
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var X = 1.1;
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var K = 0.5;
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var O = 0;
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var result = new Float64Array(2);
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%NeverOptimizeFunction(spill);
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function spill() {
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}
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function buggy() {
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var v = X;
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var phi1 = v + K;
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var phi2 = v - K;
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spill(); // At this point initial values for phi1 and phi2 are spilled.
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var xmm1 = v;
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var xmm2 = v*v*v;
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var xmm3 = v*v*v*v;
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var xmm4 = v*v*v*v*v;
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var xmm5 = v*v*v*v*v*v;
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var xmm6 = v*v*v*v*v*v*v;
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var xmm7 = v*v*v*v*v*v*v*v;
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var xmm8 = v*v*v*v*v*v*v*v*v;
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// All registers are blocked and phis for phi1 and phi2 are spilled because
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// their left (incoming) value is spilled, there are no free registers,
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// and phis themselves have only ANY-policy uses.
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for (var x = 0; x < 2; x++) {
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xmm1 += xmm1 * xmm6;
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xmm2 += xmm1 * xmm5;
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xmm3 += xmm1 * xmm4;
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xmm4 += xmm1 * xmm3;
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xmm5 += xmm1 * xmm2;
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// Now swap values of phi1 and phi2 to create cycle between phis.
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var t = phi1;
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phi1 = phi2;
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phi2 = t;
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}
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// Now we want to get values of phi1 and phi2. However we would like to
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// do it in a way that does not produce any uses of phi1&phi2 that have
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// a register beneficial policy. How? We just hide these uses behind phis.
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result[0] = (O === 0) ? phi1 : phi2;
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result[1] = (O !== 0) ? phi1 : phi2;
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}
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function test() {
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buggy();
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assertArrayEquals([X + K, X - K], result);
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}
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test();
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test();
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%OptimizeFunctionOnNextCall(buggy);
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test();
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