commit	9097a07e4e83b9f394598d53557247277b064b09	[log] [tgz]
author	Tim Northover <tnorthover@apple.com>	Mon Dec 18 10:36:00 2017 +0000
committer	Tim Northover <tnorthover@apple.com>	Mon Dec 18 10:36:00 2017 +0000
tree	33a9801ce85939366b6da2d17c31e19c12ba74c6
parent	7bd3fb15e11d4ad8f7b0df8085fb947093267d61 [diff]

AArch64: work around how Cyclone handles "movi.2d vD, #0".

For Cylone, the instruction "movi.2d vD, #0" is executed incorrectly in some rare
circumstances. Work around the issue conservatively by avoiding the instruction entirely.

This patch changes CodeGen so that problematic instructions are never
generated, and the AsmParser so that an equivalent instruction is used (with a
warning).

llvm-svn: 320965

llvm/lib/Target/AArch64/AArch64.td[diff]
llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp[diff]
llvm/lib/Target/AArch64/AArch64Subtarget.h[diff]
llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp[diff]
llvm/test/CodeGen/AArch64/arm64-fcmp-opt.ll[diff]
llvm/test/CodeGen/AArch64/arm64-zero-cycle-zeroing.ll[diff]
llvm/test/CodeGen/AArch64/fp-cond-sel.ll[diff]
llvm/test/MC/AArch64/cyclone-movi-bug.s[Added - diff]

8 files changed

tree: 33a9801ce85939366b6da2d17c31e19c12ba74c6

clang/
clang-tools-extra/
compiler-rt/
debuginfo-tests/
libclc/
libcxx/
libcxxabi/
libunwind/
lld/
lldb/
llgo/
llvm/
openmp/
parallel-libs/
polly/
README.md

README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.