Support string length in the DFG
Created attachment 109406 [details]
Comment on attachment 109406 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=109406&action=review
> if (!isInt32Prediction(m_predictions[m_compileIndex]))
Not super important, but I think you're guaranteed to have an int once you have an array / string .length property.
> + 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.