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precisely, which prevents us from infinitely peeling the loop.


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explicitly so we can check arguments.


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This means that well connected blocks are copy coalesced before the less connected blocks. Connected blocks are more difficult to
coalesce because intervals are more complicated, so handling them first gives a greater chance of success.

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PEDANTIC defaults to ON and WERROR default to off.

Also add MSVC warnings. To disable warnings add the flags
LLVM_ENABLE_WARNINGS (default on).

Patch by Tobias Grosser!


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DICompileUnit. This code now prints debug filenames successfully.


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For VMOVv*i[16,32], op bit is don't care, and some cmode bits vary depending on
the immediate values.

Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.


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New virtual registers created for spill intervals should inherit allocation hints from the original register.

This helps us avoid silly copies when rematting values that are copied to a physical register:

leaq	_.str44(%rip), %rcx
movq	%rcx, %rsi
call	_strcmp

becomes:

leaq	_.str44(%rip), %rsi
call	_strcmp

The coalescer will not touch the movq because that would tie down the physical register.

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branches even when optimizing for code size.  Unless we find evidence to the
contrary in the future, the special treatment for indirect branches does not
have a significant effect on code size, and performance still matters with -Os.


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for all the processors where I have tried it, and even when it might not help
performance, the cost is quite low.  The opportunities for duplicating
indirect branches are limited by other factors so code size does not change
much due to tail duplicating indirect branches aggressively.


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If no destination label is available, just point to the node itself
instead of pointing to some source label. Source and destination labels are
not related in any way.

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Graphviz can layout the graphs better if a node does not contain source
ports. Therefore only print the ports if the source ports are useful,
that means are not labeled with the empty string "".
This patch also simplifies graphs without any edgeSourceLabels e.g. the
dominance trees.

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 * Do not SEGFAULT if tree entryNode() is NULL
 * Print function names in dotty printer

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llvm-gcc build.


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