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Georg Neis authored
Optimize JSCallWithArrayLike with diamond speculation when probable arguments list is empty literal array The JSCallWithArraylike can be replaced with a JSCall if its probable arguments list is empty literal array. This replacement will introduce a deoptimization check to make sure the length of arguments list is 0 at runtime. This CL change this optimization to a diamond speculation which may help avoid deoptimization once and keep the fast path. This change may benefit a following usecase, function calcMax(testArray) { Array.max = function(array) { return Math.max.apply(Math, array); }; var result = []; for (var i = 0; i < testArray.length - 3; i++) { var positiveNumbers = []; for (var j = 0; j < 3; j++) { if (testArray[i + j] > 0) { positiveNumbers.push(testArray[i + j]); } } result.push(Array.max(positiveNumbers)); } return result; } testArray = [-1, 2, 3, -4, -5, -6, -7, -8, -9, 10]; for (var i = 0; i < 1000000; i++) { calcMax(testArray); } Bug: v8:9974 Change-Id: I595627e2fd937527350c8f8652d701c791b41dd3 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2967757 Commit-Queue: Georg Neis <neis@chromium.org> Reviewed-by: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#75636}
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