Simon Pilgrim e9f9467da0 [X86] X86FixupInstTunings - add VPERMILPDri -> VSHUFPDrri mapping ...

Similar to the original VPERMILPSri -> VSHUFPSrri mapping added in D143787, replacing VPERMILPDri -> VSHUFPDrri should never be any slower and saves an encoding byte.

The sibling VPERMILPDmi -> VPSHUFDmi mapping is trickier as we need the same shuffle mask in every lane (and it needs to be adjusted) - I haven't attempted that yet but we can investigate it in the future if there's interest.

Fixes #61060

Differential Revision: https://reviews.llvm.org/D148999

2023-04-23 11:48:50 +01:00

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