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104 Commits

Author SHA1 Message Date
Dan Gohman
3280793234 [WebAssembly] Use dominator information to improve BLOCK placement 
Always starting blocks at the top of their containing loops works, but creates
unnecessarily deep nesting because it makes all blocks in a loop overlap.
Refine the BLOCK placement algorithm to start blocks at nearest common
dominating points instead, which significantly shrinks them and reduces
overlapping.

llvm-svn: 253876
 2015-11-23 16:19:56 +00:00
Nico Weber
00406472e8 Try to fix build more -- like r252392 but for WebAssembly. 
llvm-svn: 252394
 2015-11-07 02:47:31 +00:00
Dan Gohman
e3e4a5ff52 [WebAssembly] Fix CFG stackification of nested loops. 
llvm-svn: 249187
 2015-10-02 21:11:36 +00:00
Dan Gohman
950a13cfa3 [WebAssembly] Check in an initial CFG Stackifier pass 
This pass implements a simple algorithm for conversion from CFG to
wasm's structured control flow. It doesn't yet handle multiple-entry
loops; that will be added in a future patch.

It also adds initial support for switch statements.

Differential Revision: http://reviews.llvm.org/D12735

llvm-svn: 247818
 2015-09-16 16:51:30 +00:00