1050312 - SIMD: use typed moves in MoveEmitter's maybeEmitOptimizedCycle on x86

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine: JIT, defect, P5)

Description

[Benjamin Bouvier [:bbouvier] (inactive)]

Followup of bug 1019831 comment 47:

MoveEmitterX86::maybeEmitOptimizedCycle currently emits an xorpd sequence if all moves are "isFloatReg()" and other conditions hold. Ideally characterizeCycle should be extended to look at the move types too, so that maybeEmitOptimizedCycle can emit pxor or xorps as appropriate. If you don't want to do that in this patch, we can do it later; xorpd is functionally correct here.