3 Commits

Author	SHA1	Message	Date
Maryam Moghadas	7614ba0a5d	[PowerPC] Fix vperm codegen ... Commit rG934d5fa2b8672695c335deed0e19d0e777c98403 changed the vperm codegen for cases that vperm is not replaced by xxperm, this patch is to revert that. Reviewed By: stefanp Differential Revision: https://reviews.llvm.org/D138736	2022-11-29 15:47:32 -06:00
Maryam Moghadas	934d5fa2b8	[PowerPC] Exploit xxperm, check for dead vectors and substitute vperm with xxperm ... vperm instruction requires the data to be in the Altivec registers, if one of the vector operands is not used after this vperm instruction then it can be substituted by xxperm which doubles the number of available registers. Reviewed By: stefanp Differential Revision: https://reviews.llvm.org/D133700	2022-11-23 13:28:12 -06:00
Stefan Pintilie	263f1b2f5d	[PowerPC] Fix combine step for shufflevector. ... The combine step for shufflevector will sometimes replace undef in the mask with a defined value. This can cause an infinite loop in some cases as another combine will then put the undef back in the mask. This patch fixes the issue so that undefs are not replaced when doing a combine. Reviewed By: ZarkoCA, amyk, quinnp, saghir Differential Revision: https://reviews.llvm.org/D127439	2022-06-14 11:31:24 -05:00