Support string length in the DFG
Created attachment 109406 [details] Patch
Comment on attachment 109406 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=109406&action=review r=me > Source/JavaScriptCore/dfg/DFGPropagator.cpp:715 > if (!isInt32Prediction(m_predictions[m_compileIndex])) > break; Not super important, but I think you're guaranteed to have an int once you have an array / string .length property. > Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp:1730 > + speculationCheck(m_jit.branch32(MacroAssembler::LessThan, resultGPR, MacroAssembler::TrustedImm32(0))); I believe we could remove this branch, and the branch on array length access, if we changed array and string length to int from unsigned, and limited their lengths to 2^31-1.
Committed r96461