7 Commits

Author	SHA1	Message	Date
Clement Courbet	36a3480385	Re-land r349731 "[CodeGen][ExpandMemcmp] Add an option for allowing overlapping loads. ... Update PPC ir following GEP->bitcat to bitcat->GEP->bitcat change. llvm-svn: 349747	2018-12-20 13:01:04 +00:00
Clement Courbet	e22cf4d7cb	Revert r349731 "[CodeGen][ExpandMemcmp] Add an option for allowing overlapping loads." ... Forgot to update PowerPC tests for the GEP->bitcast change. llvm-svn: 349733	2018-12-20 09:58:33 +00:00
Clement Courbet	1bb6e1b0f2	[CodeGen][ExpandMemcmp] Add an option for allowing overlapping loads. ... Summary: This allows expanding {7,11,13,14,15,21,22,23,25,26,27,28,29,30,31}-byte memcmp in just two loads on X86. These were previously calling memcmp. Reviewers: spatel, gchatelet Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D55263 llvm-svn: 349731	2018-12-20 09:13:47 +00:00
Sanjay Patel	5a48aef3f0	[x86, MemCmpExpansion] allow 2 pairs of loads per block (PR33325) ... This is the last step needed to fix PR33325: https://bugs.llvm.org/show_bug.cgi?id=33325 We're trading branch and compares for loads and logic ops. This makes the code smaller and hopefully faster in most cases. The 24-byte test shows an interesting construct: we load the trailing scalar elements into vector registers and generate the same pcmpeq+movmsk code that we expected for a pair of full vector elements (see the 32- and 64-byte tests). Differential Revision: https://reviews.llvm.org/D41714 llvm-svn: 321934	2018-01-06 16:16:04 +00:00
Clement Courbet	063bed9baf	re-land [ExpandMemCmp] Split ExpandMemCmp from CodeGen into its own pass." ... Fix undefined references: ExpandMemCmp belongs to CodeGen/, not Scalar/. llvm-svn: 317318	2017-11-03 12:12:27 +00:00
Clement Courbet	82bade615b	Revert "[ExpandMemCmp] Split ExpandMemCmp from CodeGen into its own pass." ... undefined reference to `llvm::TargetPassConfig::ID' on clang-ppc64le-linux-multistage This reverts commit eea333c33fa73ad225ef28607795984829f65688. llvm-svn: 317213	2017-11-02 15:53:10 +00:00
Clement Courbet	1dc37b9c3b	[ExpandMemCmp] Split ExpandMemCmp from CodeGen into its own pass. ... Summary: This is mostly a noop (most of the test diffs are renamed blocks). There are a few temporary register renames (eax<->ecx) and a few blocks are shuffled around. See the discussion in PR33325 for more details. Reviewers: spatel Subscribers: mgorny Differential Revision: https://reviews.llvm.org/D39456 llvm-svn: 317211	2017-11-02 15:02:51 +00:00