...and the two followup commits:
Revert "[Sparc][Leon] Missed resetting option flags from check-in 278489."
Revert "[Sparc][Leon] Errata fixes for various errata in different
versions of the Leon variants of the Sparc 32 bit processor."
This reverts commit r274856, r278489, and r278492.
llvm-svn: 278511
The nature of the errata are listed in the comments preceding the errata fix passes. Relevant unit tests are implemented for each of these.
These changes update older versions of these errata fixes with improvements to code and unit tests.
Differential Revision: https://reviews.llvm.org/D21960
llvm-svn: 278489
Errata fixes for various errata in different versions of the Leon variants of the Sparc 32 bit processor.
The nature of the errata are listed in the comments preceding the errata fix passes. Relevant unit tests are implemented for each of these.
Note: Running clang-format has changed a few other lines too, unrelated to the implemented errata fixes. These have been left in as this keeps the code formatting consistent.
Differential Revision: http://reviews.llvm.org/D21960
llvm-svn: 274856
Passes to fix three hardware errata that appear on some LEON processor variants.
The instructions FSMULD, FMULS and FDIVS do not work as expected on some LEON processors. This change allows those instructions to be substituted for alternatives instruction sequences that are known to work.
These passes only run when selected individually, or as part of a processor defintion. They are not included in general SPARC processor compilations for non-LEON processors or for those LEON processors that do not have these hardware errata.
llvm-svn: 273108
Due to an erratum in some versions of LEON, we must insert a NOP after any LD or LDF instruction to ensure the processor has time to load the value correctly before using it. This pass will implement that erratum fix.
The code will have no effect for other Sparc, but non-LEON processors.
Differential Review: http://reviews.llvm.org/D20353
llvm-svn: 270417
This change adds SMAC (signed multiply-accumulate) and UMAC (unsigned multiply-accumulate) for LEON subtargets of the Sparc processor.
The new files LeonFeatures.td and leon-instructions.ll will both be expanded in future, so I want to leave them separate as small files for this review, to be expanded in future check-ins.
Note: The functions are provided only for inline-assembly provision. No DAG selection is provided.
Differential Revision: http://reviews.llvm.org/D19911
llvm-svn: 268908
James Y Knight