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authorHans-Peter Nilsson <hp@axis.com>2020-01-22 05:52:16 +0100
committerHans-Peter Nilsson <hp@axis.com>2020-05-09 03:29:14 +0200
commitd0780379c1b621813fbea60449bc51b65f6f8c6e (patch)
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gcc/config/cris: Remove shared-library and CRIS v32 support.
Part of the removal of crisv32-* and cris-*-linux* (cris-elf remains). Essentially everything is gone, including functions and target-specific definitions and most obvious knock-on effects, like removing unused functions and arguments. There's one exception: the register-class effects of the CRIS v32 ACR register are deliberately excluded and left in (i.e. its use by-number is removed and the ACE_REGS regclass is always unusable - but present). Changing register class definitions to remove ACR_REGS and related classes (folding their uses into remaining classes), causes extra register moves in libgcc (as an immediate observation; actual net effect unknown), which is unwanted both for performance reasons and also causing extra work comparing before/after cc0-machinery-conversion changes ahead. The actual cause and solution for these negative effects of cleaning up the register-classes will at the moment have to remain to-be-investigated. If CRIS v32 support is reinstated, consider doing the .md part not as separate patterns with opposite conditions but merged patterns with necessarily-different alternatives using the "enabled" attribute (which was not invented back then). Also, a single ACR-related RTL-dump example in a cris.md comment, related to a strict_low_part issue is kept, but marked as obsolete. Note that the "b" register-constraint (non-ACR registers; can be used for post-increment) is left in, as that may have extant uses outside of gcc. Its availability is tested by gcc.target/cris/asm-b-1.c. When ACR register classes are removed, it's probably best to make it equal to GENERAL_REGS. gcc: * config/cris: Remove shared-library and CRIS v32 support.
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