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Sanjay Patel a46f06efe2 Use rsqrt (X86) to speed up reciprocal square root calcs 
This is a first step for generating SSE rsqrt instructions for
reciprocal square root calcs when fast-math is allowed.

For now, be conservative and only enable this for AMD btver2
where performance improves significantly - for example, 29%
on llvm/projects/test-suite/SingleSource/Benchmarks/BenchmarkGame/n-body.c
(if we convert the data type to single-precision float).

This patch adds a two constant version of the Newton-Raphson
refinement algorithm to DAGCombiner that can be selected by any target
via a parameter returned by getRsqrtEstimate()..

See PR20900 for more details:
http://llvm.org/bugs/show_bug.cgi?id=20900

Differential Revision: http://reviews.llvm.org/D5658



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220570 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-24 17:02:16 +00:00
autoconf
bindings Add llvm-go tool. 2014-10-23 02:33:23 +00:00
cmake Add llvm-go tool. 2014-10-23 02:33:23 +00:00
docs Update llvm.donothing documentation. 2014-10-23 22:36:13 +00:00
examples
include Use rsqrt (X86) to speed up reciprocal square root calcs 2014-10-24 17:02:16 +00:00
lib Use rsqrt (X86) to speed up reciprocal square root calcs 2014-10-24 17:02:16 +00:00
projects
test Use rsqrt (X86) to speed up reciprocal square root calcs 2014-10-24 17:02:16 +00:00
tools PR21189: Teach llvm-readobj to dump bits of COFF symbol subsections required to debug using VS2012+ 2014-10-23 22:25:31 +00:00
unittests Add unittest for extreme alignments. 2014-10-23 14:45:19 +00:00
utils [lit] Fix Python-3 compatibility, patch by Dan Liew. 2014-10-22 01:26:06 +00:00
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CMakeLists.txt Adding llvm-shlib to CMake build system with a few new bells and whistles 2014-10-23 17:22:14 +00:00
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