i128 and u128 support#37900

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est31 wants to merge 36 commits intorust-lang:masterfrom

Commits on Dec 15, 2016

Such large. Very 128. Much bits.

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Tests for the 128 bit integers

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Feature gate the 128 bit types

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Cleanup FIXMEs

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Fix LEB128 to work with the stage1

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Tidy

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Makefiles support for rustc_i128 crate

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Wrapping<i128> and attempt at LLVM 3.7 compat

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Fix parse-fail and compile-fail tests

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impl Step for iu128

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Add a way to retrieve constant value in 128 bits

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Implement emit_iu128 for json serialiser

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Fix i128 alignment calculation

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Fix rebase fallout

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WIP intrinsics

nagisa
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Fix rebase fallout
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Use LLVMRustConstInt128Get on stage1 too
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Compilation fixes
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Make rustdoc aware of the primitive i128 type
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Fix intrinsics and expand tests
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intrinsics : uabs and iabs
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Fix warning on 64 bit
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Move from RUSTC_CRATES to TARGET_CRATES
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40 -> 39, as ceil(log10(2^128)) == 39
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UGLY hack around an ICE bc of stage0
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Always use Rust based intrinsics on Windows
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Try to fix some things
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libcompiler_builtins: don't codegen dead code call to eh_personality
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Remove unimplemented() function
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Port to wrapping_* and unchecked_* operations
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Tidy
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Windows x64 ABI requires i128 params to be passed as reference
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intrinsics: try to return everything via {u,i}128ret to match LLVM
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Fix another windows ABI mistake
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Tidy
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Fix rebase fallout
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