Simon Dardis 8181753289 [mips] Spectre variant two mitigation for MIPSR2 ... This patch provides mitigation for CVE-2017-5715, Spectre variant two, which affects the P5600 and P6600. It implements the LLVM part of -mindirect-jump=hazard. It is _not_ enabled by default for the P5600. The migitation strategy suggested by MIPS for these processors is to use hazard barrier instructions. 'jalr.hb' and 'jr.hb' are hazard barrier variants of the 'jalr' and 'jr' instructions respectively. These instructions impede the execution of instruction stream until architecturally defined hazards (changes to the instruction stream, privileged registers which may affect execution) are cleared. These instructions in MIPS' designs are not speculated past. These instructions are used with the attribute +use-indirect-jump-hazard when branching indirectly and for indirect function calls. These instructions are defined by the MIPS32R2 ISA, so this mitigation method is not compatible with processors which implement an earlier revision of the MIPS ISA. Performance benchmarking of this option with -fpic and lld using -z hazardplt shows a difference of overall 10%~ time increase for the LLVM testsuite. Certain benchmarks such as methcall show a substantially larger increase in time due to their nature. Reviewers: atanasyan, zoran.jovanovic Differential Revision: https://reviews.llvm.org/D43486 llvm-svn: 325653		2018-02-21 00:06:53 +00:00
..
Analysis	[MemoryBuiltins] Check nobuiltin status when identifying calls to free.	2018-02-20 22:00:33 +00:00
AsmParser	[DebugInfo] Unify ChecksumKind and Checksum value in DIFile	2018-02-12 19:45:54 +00:00
BinaryFormat	Add DWARF for discriminated unions	2018-02-06 23:45:59 +00:00
Bitcode	bitcode support change for fast flags compatibility	2018-02-19 19:22:28 +00:00
CodeGen	[PBQP] Fix PR33038 by pruning empty intervals in initializeGraph.	2018-02-20 22:15:09 +00:00
DebugInfo	[dwarfdump] Fix spurious verification errors for DW_AT_location attributes	2018-02-17 13:06:37 +00:00
Demangle
ExecutionEngine	Report fatal error in the case of out of memory	2018-02-20 05:41:26 +00:00
Fuzzer
FuzzMutate	[llvm-opt-fuzzer] Add another pack of passes for continuous fuzzing	2018-02-19 11:57:07 +00:00
IR	[InstCombine] fold fdiv with non-splat divisor to fmul: X/C --> X * (1/C)	2018-02-20 16:08:15 +00:00
IRReader	LLParser: add an argument for overriding data layout and do not check alloca addr space	2018-01-30 22:32:39 +00:00
LineEditor
Linker	[ThinLTO] Import global variables	2018-02-16 08:11:04 +00:00
LTO	[LTO] Remove unused Path parameter to AddBufferFn	2018-02-20 20:21:53 +00:00
MC	[MC] - Don't crash on unclosed frame.	2018-02-20 09:04:13 +00:00
Object	Report fatal error in the case of out of memory	2018-02-20 05:41:26 +00:00
ObjectYAML	AMDGPU: Bring elf flags in sync with the spec	2018-02-16 22:33:59 +00:00
Option	[Option] For typo '-foo', suggest '--foo'	2018-01-09 19:38:04 +00:00
Passes	Another try to commit 323321 (aggressive instruction combine).	2018-01-25 12:06:32 +00:00
ProfileData
Support	Report fatal error in the case of out of memory	2018-02-20 05:41:26 +00:00
TableGen	[tablegen] Fixed few !foreach evaluation issues.	2018-02-09 18:37:55 +00:00
Target	[mips] Spectre variant two mitigation for MIPSR2	2018-02-21 00:06:53 +00:00
Testing
ToolDrivers	[COFF] Keep the underscore on exported decorated stdcall functions in MSVC mode	2018-01-20 11:44:32 +00:00
Transforms	[InstCombine] C / -X --> -C / X	2018-02-21 00:01:45 +00:00
WindowsManifest
XRay	[XRay] clarify error messages when parsing broken traces	2018-01-30 13:41:34 +00:00
CMakeLists.txt
LLVMBuild.txt