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5ed377ecc1
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Geoff Berry 5ed377ecc1 [AArch64] Fold spills of COPY of WZR/XZR 
Summary:
In AArch64InstrInfo::foldMemoryOperandImpl, catch more cases where the
COPY being spilled is copying from WZR/XZR, but the source register is
not in the COPY destination register's regclass.

For example, when spilling:

  %vreg0 = COPY %XZR ; %vreg0:GPR64common

without this change, the code in TargetInstrInfo::foldMemoryOperand()
and canFoldCopy() that normally handles cases like this would fail to
optimize since %XZR is not in GPR64common.  So the spill code generated
would be:

  %vreg0 = COPY %XZR
  STR %vreg

instead of the new code generated:

  STR %XZR

Reviewers: qcolombet, MatzeB

Subscribers: mcrosier, aemerson, t.p.northover, llvm-commits, rengolin

Differential Revision: https://reviews.llvm.org/D26976

llvm-svn: 288176
2016-11-29 18:28:32 +00:00
bindings Fix go binding to adapt the new attribute API 2016-11-18 10:11:02 +00:00
cmake cmake: Set rpath for loadable modules as well as shared libraries. 2016-11-28 21:59:14 +00:00
docs [docs] Typos and whitespace fixed in LTO docs. 2016-11-29 18:00:31 +00:00
examples ExceptionDemo: remove some undefined behaviour 2016-11-20 02:36:38 +00:00
include Suppress abi-breaking.h on cygming, for now. 2016-11-29 17:32:58 +00:00
lib [AArch64] Fold spills of COPY of WZR/XZR 2016-11-29 18:28:32 +00:00
projects
resources
runtimes [CMake] Make the runtimes directory work with bootstrap builds 2016-10-19 21:50:25 +00:00
test [AArch64] Fold spills of COPY of WZR/XZR 2016-11-29 18:28:32 +00:00
tools Object: Add IRObjectFile::getTargetTriple(). 2016-11-24 01:13:09 +00:00
unittests [PM] Extend the explicit 'invalidate' method API on analysis results to 2016-11-28 22:04:31 +00:00
utils TableGen: Allow signed immediates for instruction aliases 2016-11-24 08:53:28 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore
CMakeLists.txt Add link-time detection of LLVM_ABI_BREAKING_CHECKS mismatch 2016-11-28 22:23:53 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take ownership of the X86 backend. 2016-11-12 05:16:06 +00:00
configure
CREDITS.TXT Test Commit, removing a blank line in CREDITS.TXT 2016-11-24 15:40:19 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit, deleted empty line at the end of README.txt 2016-11-07 18:31:21 +00:00
RELEASE_TESTERS.TXT

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