GCC modified for the FreeChainXenon project
2724d1bba6
This teaches forwprop to rewrite more vector loads that are only used in BIT_FIELD_REFs as scalar loads. This provides the remaining uplift to SPEC CPU 2017 510.parest_r on Zen 2 which has CPU gathers disabled. In particular vector load + vec_unpack + bit-field-ref is turned into (extending) scalar loads which avoids costly XMM/GPR transitions. To not conflict with vector load + bit-field-ref + vector constructor matching to vector load + shuffle the extended transform is only done after vector lowering. 2021-07-30 Richard Biener <rguenther@suse.de> * tree-ssa-forwprop.c (pass_forwprop::execute): Split out code to decompose vector loads ... (optimize_vector_load): ... here. Generalize it to handle intermediate widening and TARGET_MEM_REF loads and apply it to loads with a supported vector mode as well. |
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