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3 Commits

Author SHA1 Message Date
Dan Gohman f0b165a7f8 [WebAssembly] Implement ReverseBranchCondition, and re-enable MachineBlockPlacement 
This patch introduces a codegen-only instruction currently named br_unless,
which makes it convenient to implement ReverseBranchCondition and re-enable
the MachineBlockPlacement pass. Then in a late pass, it lowers br_unless
back into br_if.

Differential Revision: http://reviews.llvm.org/D14995

llvm-svn: 254826
 2015-12-05 03:03:35 +00:00
Dan Gohman 4da4abd87f [WebAssembly] Fix scheduling dependencies in register-stackified code 
Add physical register defs to instructions used from stackified
instructions to prevent them from being scheduled into the middle of
a stack sequence. This is a conservative measure which may be loosened
in the future.

Differential Revision: http://reviews.llvm.org/D15252

llvm-svn: 254811
 2015-12-05 00:51:40 +00:00
Dan Gohman 81719f8555 [WebAssembly] Support for register stackifying with load and store instructions. 
llvm-svn: 254076
 2015-11-25 16:55:01 +00:00