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Author SHA1 Message Date
Marcin Koscielnicki ad1482c6f1 [SystemZ] Implement backchain attribute (recommit with fix). 
This introduces a SystemZ-specific "backchain" attribute on function, which
enables writing the frame backchain link as specified by the ABI.  This will
be used to implement -mbackchain option in clang.

Differential Revision: http://reviews.llvm.org/D19889

Fixed in this version: added RegState::Define and RegState::Kill on R1D
in prologue.

llvm-svn: 268581
 2016-05-05 00:37:30 +00:00
Marcin Koscielnicki 12037b4e9d Revert "[SystemZ] Implement backchain attribute." 
This reverts commit rL268571.

It caused failures in register scavenger.

llvm-svn: 268576
 2016-05-04 23:54:53 +00:00
Marcin Koscielnicki 835d927938 [SystemZ] Implement backchain attribute. 
This introduces a SystemZ-specific "backchain" attribute on function, which
enables writing the frame backchain link as specified by the ABI.  This will
be used to implement -mbackchain option in clang.

Differential Revision: http://reviews.llvm.org/D19889

llvm-svn: 268571
 2016-05-04 23:31:20 +00:00