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On little endian targets prior to Power9, we spill vector registers using a swapping store (i.e. stdxvd2x saves the vector with the two doublewords in big endian order regardless of endianness). This is generally not a problem since we restore them using the corresponding swapping load (lxvd2x). However if the restore is done by the unwinder, the vector register contains data in the incorrect order. This patch fixes that by using Altivec loads/stores for vector saves and restores in PEI (which keep the order correct) under those specific conditions: - EH aware function - Subtarget requires swaps for VSX memops (Little Endian prior to Power9) Differential revision: https://reviews.llvm.org/D73692 |
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