Akira Hatanaka 243702b95a [mips] Fix definition of mfhi and mflo instructions to read from the whole ...

accumulator instead of its sub-registers, $hi and $lo. 

We need this change to prevent a mflo following a mtlo from reading an
unpredictable/undefined value, as shown in the following example:

mult $6, $7 // result of $6 * $7 is written to $lo and $hi.
mflo $2     // read lower 32-bit result from $lo.
mtlo $4     // write to $lo. the content of $hi becomes unpredictable.
mfhi $3     // read higher 32-bit from $hi, which has an unpredictable value.

I don't have a test case for this change that reliably reproduces the problem.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192119 91177308-0d34-0410-b5e6-96231b3b80d8

2013-10-07 18:49:46 +00:00

..

Analysis

Rename DataLayout variables TD -> DL

2013-10-03 19:50:01 +00:00

AsmParser

Add support for aliases with linkonce_odr.

2013-10-06 15:10:43 +00:00

Bitcode

AutoUpgrade: upgrade from scalar TBAA format to struct-path aware TBAA format.

2013-09-28 00:22:27 +00:00

CodeGen

Formally added an explicit enum for DWARF TLS support. No functionality change.

2013-10-07 18:39:18 +00:00

DebugInfo

[DebugInfo] Further simplify DWARFDebugAranges public interface

2013-10-02 07:12:47 +00:00

ExecutionEngine

Remove dead code.

2013-10-07 13:54:50 +00:00

IR

Change objectsize intrinsic to accept different address spaces.

2013-10-07 18:06:48 +00:00

IRReader

Add 'const' qualifiers to static const char* variables.

2013-07-16 01:17:10 +00:00

Linker

Implement function prefix data as an IR feature.

2013-09-16 01:08:15 +00:00

LTO

Remove some really nasty uses of hasRawTextSupport.

2013-10-05 16:42:21 +00:00

MC

Fix the documentation of getDefaultSubtargetFeatures.

2013-10-07 13:34:05 +00:00

Object

Object/COFF: Rename getXXX{Begin,End} -> xxx_{begin,end}.

2013-09-27 21:47:05 +00:00

Option

Fix another mistake in r190442.

2013-09-10 23:22:56 +00:00

Support

Formally added an explicit enum for DWARF TLS support. No functionality change.

2013-10-07 18:39:18 +00:00

TableGen

Add an error check for a typo I accidentally made in a td file that caused an assert to fire.

2013-08-20 04:22:09 +00:00

Target

[mips] Fix definition of mfhi and mflo instructions to read from the whole

2013-10-07 18:49:46 +00:00

Transforms

UpdatePHINodes in BasicBlockUtils should not crash on duplicate predecessors

2013-10-04 23:41:05 +00:00

CMakeLists.txt

Move LTO support library to a component, allowing it to be tested

2013-09-24 23:52:22 +00:00

LLVMBuild.txt

Move LTO support library to a component, allowing it to be tested

2013-09-24 23:52:22 +00:00

Makefile

Move LTO support library to a component, allowing it to be tested

2013-09-24 23:52:22 +00:00