Daniel Sanders 58b6bfeb22 [mips][fp64] Add an implicit def to MTHC1 claiming that it reads the lower 32-bits of 64-bit FPR ...

Summary:
This is a white lie to workaround a widespread bug in the -mfp64
implementation.

The problem is that none of the 32-bit fpu ops mention the fact that they
clobber the upper 32-bits of the 64-bit FPR. This allows MTHC1 to be
scheduled on the wrong side of most 32-bit FPU ops, particularly MTC1.
Fixing that requires a major overhaul of the FPU implementation which can't
be done right now due to time constraints.

The testcase is SingleSource/Benchmarks/Misc/oourafft.c when given
TARGET_CFLAGS='-mips32r2 mfp64 -mmsa'.

Also correct the comment added in r203464 to indicate that two
instructions were affected.

Reviewers: matheusalmeida, jacksprat

Reviewed By: matheusalmeida

Differential Revision: http://llvm-reviews.chandlerc.com/D3029

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203659 91177308-0d34-0410-b5e6-96231b3b80d8

2014-03-12 13:35:43 +00:00

..

Analysis

IR: add a second ordering operand to cmpxhg for failure

2014-03-11 10:48:52 +00:00

AsmParser

IR: add a second ordering operand to cmpxhg for failure

2014-03-11 10:48:52 +00:00

Bitcode

IR: add a second ordering operand to cmpxhg for failure

2014-03-11 10:48:52 +00:00

CodeGen

Replace '#include ValueTypes.h' with forward declarations.

2014-03-12 08:00:24 +00:00

DebugInfo

Replace OwningPtr<T> with std::unique_ptr<T>.

2014-03-06 05:51:42 +00:00

ExecutionEngine

[ppc64] Patch in TOC restore code after all external function calls

2014-03-11 15:26:27 +00:00

IR

Remove copy ctors that did the same thing as the default one.

2014-03-11 11:32:49 +00:00

IRReader

Replace OwningPtr<T> with std::unique_ptr<T>.

2014-03-06 05:51:42 +00:00

LineEditor

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Linker

[Layering] Sink Linker.h into a Linker subdirectory to make it

2014-03-06 03:42:23 +00:00

LTO

[C++11] Add 'override' keyword to virtual methods that override their base class.

2014-03-08 07:51:20 +00:00

MC

Simplify a really complicated check for Arch == X86_64.

2014-03-11 21:22:57 +00:00

Object

Object: rename ARMV7 to ARMNT

2014-03-11 03:08:37 +00:00

Option

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Support

support: add a utility function to normalise path separators

2014-03-11 22:05:42 +00:00

TableGen

Replace OwningPtr<T> with std::unique_ptr<T>.

2014-03-06 05:51:42 +00:00

Target

[mips][fp64] Add an implicit def to MTHC1 claiming that it reads the lower 32-bits of 64-bit FPR

2014-03-12 13:35:43 +00:00

Transforms

Fix crash in PRE.

2014-03-11 15:07:32 +00:00

CMakeLists.txt

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LLVMBuild.txt

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Makefile

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