9cedb8bb69
Upgrade our copy of llvm/clang to 3.4 release. This version supports all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC 262121 (by emaste): Update lldb for clang/llvm 3.4 import This commit largely restores the lldb source to the upstream r196259 snapshot with the addition of threaded inferior support and a few bug fixes. Specific upstream lldb revisions restored include: SVN git 181387 779e6ac 181703 7bef4e2 182099 b31044e 182650 f2dcf35 182683 0d91b80 183862 15c1774 183929 99447a6 184177 0b2934b 184948 4dc3761 184954 007e7bc 186990 eebd175 Sponsored by: DARPA, AFRL MFC 262186 (by emaste): Fix mismerge in r262121 A break statement was lost in the merge. The error had no functional impact, but restore it to reduce the diff against upstream. MFC 262303: Pull in r197521 from upstream clang trunk (by rdivacky): Use the integrated assembler by default on FreeBSD/ppc and ppc64. Requested by: jhibbits MFC 262611: Pull in r196874 from upstream llvm trunk: Fix a crash that occurs when PWD is invalid. MCJIT needs to be able to run in hostile environments, even when PWD is invalid. There's no need to crash MCJIT in this case. The obvious fix is to simply leave MCContext's CompilationDir empty when PWD can't be determined. This way, MCJIT clients, and other clients that link with LLVM don't need a valid working directory. If we do want to guarantee valid CompilationDir, that should be done only for clients of getCompilationDir(). This is as simple as checking for an empty string. The only current use of getCompilationDir is EmitGenDwarfInfo, which won't conceivably run with an invalid working dir. However, in the purely hypothetically and untestable case that this happens, the AT_comp_dir will be omitted from the compilation_unit DIE. This should help fix assertions occurring with ports-mgmt/tinderbox, when it is using jails, and sometimes invalidates clang's current working directory. Reported by: decke MFC 262809: Pull in r203007 from upstream clang trunk: Don't produce an alias between destructors with different calling conventions. Fixes pr19007. (Please note that is an LLVM PR identifier, not a FreeBSD one.) This should fix Firefox and/or libxul crashes (due to problems with regparm/stdcall calling conventions) on i386. Reported by: multiple users on freebsd-current PR: bin/187103 MFC 263048: Repair recognition of "CC" as an alias for the C++ compiler, since it was silently broken by upstream for a Windows-specific use-case. Apparently some versions of CMake still rely on this archaic feature... Reported by: rakuco MFC 263049: Garbage collect the old way of adding the libstdc++ include directories in clang's InitHeaderSearch.cpp. This has been superseded by David Chisnall's commit in r255321. Moreover, if libc++ is used, the libstdc++ include directories should not be in the search path at all. These directories are now only used if you pass -stdlib=libstdc++.
266 lines
7.0 KiB
Groff
266 lines
7.0 KiB
Groff
.\" $FreeBSD$
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.\" Man page generated from reStructuredText.
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.
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.TH "LLC" "1" "2014-01-01" "3.4" "LLVM"
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.SH NAME
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llc \- LLVM static compiler
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..
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..
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.\" indent \\n[an-margin]
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.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
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..
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.SH SYNOPSIS
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.sp
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\fBllc\fP [\fIoptions\fP] [\fIfilename\fP]
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.SH DESCRIPTION
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.sp
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The \fBllc\fP command compiles LLVM source inputs into assembly language
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for a specified architecture. The assembly language output can then be passed
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through a native assembler and linker to generate a native executable.
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.sp
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The choice of architecture for the output assembly code is automatically
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determined from the input file, unless the \fI\%\-march\fP option is used to
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override the default.
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.SH OPTIONS
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.sp
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If \fBfilename\fP is "\fB\-\fP" or omitted, \fBllc\fP reads from standard input.
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Otherwise, it will from \fBfilename\fP\&. Inputs can be in either the LLVM assembly
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language format (\fB\&.ll\fP) or the LLVM bitcode format (\fB\&.bc\fP).
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.sp
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If the \fI\-o\fP option is omitted, then \fBllc\fP will send its output
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to standard output if the input is from standard input. If the \fI\-o\fP
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option specifies "\fB\-\fP", then the output will also be sent to standard output.
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.sp
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If no \fI\-o\fP option is specified and an input file other than "\fB\-\fP" is
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specified, then \fBllc\fP creates the output filename by taking the input
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filename, removing any existing \fB\&.bc\fP extension, and adding a \fB\&.s\fP suffix.
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.sp
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Other \fBllc\fP options are described below.
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.SS End\-user Options
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.INDENT 0.0
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.TP
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.B \-help
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Print a summary of command line options.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-O=uint
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Generate code at different optimization levels. These correspond to the
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\fB\-O0\fP, \fB\-O1\fP, \fB\-O2\fP, and \fB\-O3\fP optimization levels used by
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\fBllvm\-gcc\fP and \fBclang\fP\&.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-mtriple=<target triple>
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Override the target triple specified in the input file with the specified
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string.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-march=<arch>
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Specify the architecture for which to generate assembly, overriding the target
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encoded in the input file. See the output of \fBllc \-help\fP for a list of
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valid architectures. By default this is inferred from the target triple or
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autodetected to the current architecture.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-mcpu=<cpuname>
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Specify a specific chip in the current architecture to generate code for.
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By default this is inferred from the target triple and autodetected to
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the current architecture. For a list of available CPUs, use:
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.INDENT 7.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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llvm\-as < /dev/null | llc \-march=xyz \-mcpu=help
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-filetype=<output file type>
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Specify what kind of output \fBllc\fP should generated. Options are: \fBasm\fP
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for textual assembly ( \fB\(aq.s\(aq\fP), \fBobj\fP for native object files (\fB\(aq.o\(aq\fP)
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and \fBnull\fP for not emitting anything (for performance testing).
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.sp
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Note that not all targets support all options.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-mattr=a1,+a2,\-a3,...
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Override or control specific attributes of the target, such as whether SIMD
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operations are enabled or not. The default set of attributes is set by the
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current CPU. For a list of available attributes, use:
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.INDENT 7.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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llvm\-as < /dev/null | llc \-march=xyz \-mattr=help
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-disable\-fp\-elim
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Disable frame pointer elimination optimization.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-disable\-excess\-fp\-precision
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Disable optimizations that may produce excess precision for floating point.
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Note that this option can dramatically slow down code on some systems
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(e.g. X86).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-enable\-no\-infs\-fp\-math
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Enable optimizations that assume no Inf values.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-enable\-no\-nans\-fp\-math
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Enable optimizations that assume no NAN values.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-enable\-unsafe\-fp\-math
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Enable optimizations that make unsafe assumptions about IEEE math (e.g. that
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addition is associative) or may not work for all input ranges. These
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optimizations allow the code generator to make use of some instructions which
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would otherwise not be usable (such as \fBfsin\fP on X86).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-enable\-correct\-eh\-support
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Instruct the \fBlowerinvoke\fP pass to insert code for correct exception
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handling support. This is expensive and is by default omitted for efficiency.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-stats
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Print statistics recorded by code\-generation passes.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-time\-passes
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Record the amount of time needed for each pass and print a report to standard
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error.
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-load=<dso_path>
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Dynamically load \fBdso_path\fP (a path to a dynamically shared object) that
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implements an LLVM target. This will permit the target name to be used with
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the \fI\%\-march\fP option so that code can be generated for that target.
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.UNINDENT
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.SS Tuning/Configuration Options
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.INDENT 0.0
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.TP
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.B \-\-print\-machineinstrs
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Print generated machine code between compilation phases (useful for debugging).
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-regalloc=<allocator>
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Specify the register allocator to use.
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Valid register allocators are:
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.sp
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\fIbasic\fP
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.INDENT 7.0
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.INDENT 3.5
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Basic register allocator.
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.UNINDENT
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.UNINDENT
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.sp
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\fIfast\fP
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.INDENT 7.0
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.INDENT 3.5
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Fast register allocator. It is the default for unoptimized code.
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.UNINDENT
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.UNINDENT
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.sp
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\fIgreedy\fP
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.INDENT 7.0
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.INDENT 3.5
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Greedy register allocator. It is the default for optimized code.
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.UNINDENT
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.UNINDENT
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.sp
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\fIpbqp\fP
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.INDENT 7.0
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.INDENT 3.5
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Register allocator based on \(aqPartitioned Boolean Quadratic Programming\(aq.
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.INDENT 0.0
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.TP
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.B \-\-spiller=<spiller>
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Specify the spiller to use for register allocators that support it. Currently
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this option is used only by the linear scan register allocator. The default
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\fBspiller\fP is \fIlocal\fP\&. Valid spillers are:
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.sp
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\fIsimple\fP
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.INDENT 7.0
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.INDENT 3.5
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Simple spiller
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.UNINDENT
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.UNINDENT
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.sp
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\fIlocal\fP
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.INDENT 7.0
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.INDENT 3.5
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Local spiller
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.UNINDENT
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.UNINDENT
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.UNINDENT
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.SS Intel IA\-32\-specific Options
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.INDENT 0.0
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.TP
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.B \-\-x86\-asm\-syntax=[att|intel]
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Specify whether to emit assembly code in AT&T syntax (the default) or Intel
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syntax.
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.UNINDENT
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.SH EXIT STATUS
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.sp
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If \fBllc\fP succeeds, it will exit with 0. Otherwise, if an error
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occurs, it will exit with a non\-zero value.
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.SH SEE ALSO
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.sp
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lli
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.SH AUTHOR
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Maintained by The LLVM Team (http://llvm.org/).
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.SH COPYRIGHT
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2003-2013, LLVM Project
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.\" Generated by docutils manpage writer.
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.
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