Re-land "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion."

(fixed unit tests by making comparisons stable)

This reverts commit 1b2d359ce256fd6737da4e93833346a

Re-land "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion."

(fixed unit tests by making comparisons stable)

This reverts commit 1b2d359ce256fd6737da4e93833346a0bd6d7583.

llvm-svn: 315056

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Revert "Re-land "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion."""

broken test on windows

This reverts commit c91479518344fd1fc071c5bd5848f6eb83e53dca.

llv

Revert "Re-land "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion."""

broken test on windows

This reverts commit c91479518344fd1fc071c5bd5848f6eb83e53dca.

llvm-svn: 314985

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Re-land "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion.""

llvm-svn: 314980

Revert "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion."

Breaks
clang-stage1-cmake-RA-incremental/llvm/test/Transforms/MergeICmps/X86/tuple-four-int8.ll

This

Revert "[MergeICmps] Disable mergeicmps if the target does not want to handle memcmp expansion."

Breaks
clang-stage1-cmake-RA-incremental/llvm/test/Transforms/MergeICmps/X86/tuple-four-int8.ll

This reverts commit 3038c459d67f8898ffa295d54a013b280690abfa.

llvm-svn: 314972

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[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

[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

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[NFC] clang-format lib/Transforms/Scalar/MergeICmps.cpp

llvm-svn: 314906

[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: explici

[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

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Reland rL312315: [MergeICmps] MergeICmps is a new optimization pass that turns chains of integer

Add missing header.

This reverts commit 86dd6335cf7607af22f383a9a8e072ba929848cf.

llvm-svn: 312322

[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

[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

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