Hans Wennborg 35cba4cf6a X86: Don't emit SAHF/LAHF for 64-bit targets unless explicitly supported ...

These instructions are not supported by all CPUs in 64-bit mode. Emitting them
causes Chromium to crash on start-up for users with such chips.

(GCC puts these instructions behind -msahf on 64-bit for the same reason.)

This patch adds FeatureLAHFSAHF, enables it by default for 32-bit targets
and modern CPUs, and changes X86InstrInfo::copyPhysReg back to the lowering
from before r244503 when the instructions are not available.

Differential Revision: http://reviews.llvm.org/D15240

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254793 91177308-0d34-0410-b5e6-96231b3b80d8

2015-12-04 23:00:33 +00:00

..

Analysis

[Analysis] Become aware of MSVC's new/delete functions

2015-12-03 22:45:19 +00:00

AsmParser

[CXX TLS calling convention] Add CXX TLS calling convention.

2015-12-04 17:40:13 +00:00

Bitcode

Remove "ExportingModule" from ThinLTO Index (NFC)

2015-12-03 02:37:23 +00:00

CodeGen

ScheduleDAGInstrs: Move LiveIntervals field to ScheduleDAGMI

2015-12-04 19:54:24 +00:00

DebugInfo

[llvm-dwp] Retrieve the DWOID from the CU for the cu_index entry

2015-12-04 17:20:04 +00:00

ExecutionEngine

[Orc] Rename JITCompileCallbackManagerBase to JITCompileCallbackManager.

2015-12-04 02:15:39 +00:00

Fuzzer

[libFuzzer] compute base64 in-process instead of using an external lib. Since libFuzzer should not depend on anything, just re-implement base64 encoder. PR25746

2015-12-04 22:29:39 +00:00

IR

[OperandBundles] Allow operand-specific attributes in operand bundles

2015-12-04 20:34:37 +00:00

IRReader

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LibDriver

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LineEditor

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Linker

Always pass a diagnostic handler to the linker.

2015-12-04 22:08:53 +00:00

LTO

MSVC complains about this being ambiguous.

2015-12-04 22:26:21 +00:00

MC

MC: Make sure to clear *all* of MCMachOStreamer's state

2015-12-03 00:52:20 +00:00

Object

Remove "ExportingModule" from ThinLTO Index (NFC)

2015-12-03 02:37:23 +00:00

Option

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Passes

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ProfileData

Revert "[llvm-profdata] Add support for weighted merge of profile data"

2015-12-04 02:13:58 +00:00

Support

Revert "raw_ostream: << operator for callables with raw_stream argument"

2015-12-03 23:00:28 +00:00

TableGen

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Target

X86: Don't emit SAHF/LAHF for 64-bit targets unless explicitly supported

2015-12-04 23:00:33 +00:00

Transforms

[SimplifyLibCalls] Optimization for pow(x, n) where n is some constant

2015-12-04 22:00:47 +00:00

CMakeLists.txt

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LLVMBuild.txt

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Makefile

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