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Author SHA1 Message Date
Clement Courbet 902eef32eb [MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion. 
Summary: This is to avoid e.g. merging two cheap icmps if the target is not going to expand to something nice later.

Reviewers: dberlin, spatel

Subscribers: davide, nemanjai

Differential Revision: https://reviews.llvm.org/D38232

llvm-svn: 314970
 2017-10-05 07:49:09 +00:00
Clement Courbet 98eaa88357 [NFC] clang-format lib/Transforms/Scalar/MergeICmps.cpp 
llvm-svn: 314906
 2017-10-04 15:13:52 +00:00
Clement Courbet bc0c4459c9 [MergeICmps] Fix build of rL312315 on clang-with-thin-lto-windows: 
MergeICmps.cpp(68,15): error: chosen constructor is explicit in copy-initialization
      return {};
APInt.h(339,12): note: explicit constructor declared here
  explicit APInt() : BitWidth(1) { U.VAL = 0; }
             ^
MergeICmps.cpp(56,9): note: in implicit initialization of field 'Offset' with omitted
initializer
  APInt Offset;
          ^

llvm-svn: 312326
 2017-09-01 11:51:23 +00:00
Clement Courbet 65130e2d8d Reland rL312315: [MergeICmps] MergeICmps is a new optimization pass that turns chains of integer 
Add missing header.

This reverts commit 86dd6335cf7607af22f383a9a8e072ba929848cf.

llvm-svn: 312322
 2017-09-01 10:56:34 +00:00
Clement Courbet 316212575b Revert "[MergeICmps] MergeICmps is a new optimization pass that turns chains of integer" 
Break build

This reverts commit d07ab866f7f88f81e49046d691a80dcd32d7198b.

llvm-svn: 312317
 2017-09-01 09:43:08 +00:00
Clement Courbet 9473c01e96 [MergeICmps] MergeICmps is a new optimization pass that turns chains of integer 
comparisons into memcmp.

Thanks to recent improvements in the LLVM codegen, the memcmp is typically
inlined as a chain of efficient hardware comparisons.
This typically benefits C++ member or nonmember operator==().

For now this is disabled by default until:
 - https://bugs.llvm.org/show_bug.cgi?id=33329 is complete
 - Benchmarks show that this is always useful.

Differential Revision:
https://reviews.llvm.org/D33987

llvm-svn: 312315
 2017-09-01 09:07:05 +00:00