llvm dev - Apr 2013 - [LLVMdev] [RFC/PATCH][1/4] New SystemZ backend: LLVM code changes

Hello,

this set of patches adds SystemZ support to base LLVM.  This is split up
into three patches just to simplify review; they should be committed as a
single change if approved.

The first patch adds SystemZ support to the configure logic and support for
the systemz Triple.  This ought to be straightfoward.

The second patch adds changes to LLVM common code required to support the
SystemZ ELF object format, including relocation types and processing and
the runtime loader.  There is one change to common code that it not solely
SystemZ related: the patch adds a new routine "getStubAlignment",
which a
target can use to inform common code that JIT stubs require a certain
alignment.  Note that common code will not actually perform that alignment,
but it will add enough extra space when allocating text sections to enable
platform code to align its stubs accordingly.  [ This new routine will
return 1 for all existing platforms, and thus ought not to change any
existing behaviour.  ]

The third patch then adds all the backend files.  No further changes to
common code are required to get the LLVM backend working.

[See also LLVMdev for the full set of SystemZ patches and discussion.]

Bye,
Ulrich

(See attached file: diff-systemz-llvm-config)(See attached file:
diff-systemz-llvm-object)(See attached file: diff-systemz-llvm-target)
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The MCJIT parts of the patch look good.

-Andy

-----Original Message-----
From: llvm-commits-bounces at cs.uiuc.edu [mailto:llvm-commits-bounces at
cs.uiuc.edu] On Behalf Of Ulrich Weigand
Sent: Sunday, April 14, 2013 11:00 AM
To: LLVM Developers Mailing List; llvm-commits at cs.uiuc.edu
Subject: [RFC/PATCH][1/4] New SystemZ backend: LLVM code changes


Hello,

this set of patches adds SystemZ support to base LLVM.  This is split up into
three patches just to simplify review; they should be committed as a single
change if approved.

The first patch adds SystemZ support to the configure logic and support for the
systemz Triple.  This ought to be straightfoward.

The second patch adds changes to LLVM common code required to support the
SystemZ ELF object format, including relocation types and processing and the
runtime loader.  There is one change to common code that it not solely SystemZ
related: the patch adds a new routine "getStubAlignment", which a
target can use to inform common code that JIT stubs require a certain alignment.
Note that common code will not actually perform that alignment, but it will add
enough extra space when allocating text sections to enable platform code to
align its stubs accordingly.  [ This new routine will return 1 for all existing
platforms, and thus ought not to change any existing behaviour.  ]

The third patch then adds all the backend files.  No further changes to common
code are required to get the LLVM backend working.

[See also LLVMdev for the full set of SystemZ patches and discussion.]

Bye,
Ulrich

(See attached file: diff-systemz-llvm-config)(See attached file:
diff-systemz-llvm-object)(See attached file: diff-systemz-llvm-target)