llvm-project

Author	SHA1	Message	Date
Sanjay Patel	5e7b7b7503	[x86] regenerate checks with update_llc_test_checks.py The dream of a unified check-line auto-generator for all phases of compilation is dead. The llc script has already diverged to be better at its goal, so having 2 scripts that do almost the same thing is just causing confusion. We can rip out the llc ability in update_test_checks.py next and rename it, so it will be clear that we have one script for llc check auto-generation and another for opt. llvm-svn: 305206	2017-06-12 17:31:36 +00:00
Sanjay Patel	ca92c36e01	[DAG] enhance computeKnownBits to handle SHL with vector splat constant Also, use APInt to avoid crashing on types larger than vNi64. llvm-svn: 284874	2016-10-21 20:16:27 +00:00
Sanjay Patel	81029f6a76	[DAG] fold negation of sign-bit 0 - X --> 0, if the sub is NUW 0 - X --> 0, if X is 0 or the minimum signed value and the sub is NSW 0 - X --> X, if X is 0 or the minimum signed value This is the DAG equivalent of: https://reviews.llvm.org/rL284649 plus the fold for the NUW case which already existed in InstSimplify. Note that we miss a vector fold because of a deficiency in the DAG version of computeKnownBits(). llvm-svn: 284844	2016-10-21 17:24:26 +00:00
Sanjay Patel	97de8a4c3a	[x86] add tests for potential negation folds These are the backend equivalents for the tests added in r284627. The patterns may emerge late, so we should have folds for these in the DAG too. llvm-svn: 284842	2016-10-21 16:56:29 +00:00