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Author SHA1 Message Date
Andrew Wilkins f3718a9bf1 [llgo] irgen: generate switch instructions 
Summary:
    With this patch, llgo uses ssautil.Switches
    to reconstitute (and synthesise) switches,
    which can then be lowered to lookup tables,
    trees, etc.

    We currently only handle integer const case
    switches. We erase the comparison blocks (other
    than the initial block), and generate a switch
    instruction at the end of the block starting
    the if-else-if chain. ssautil.Switches does
    not remove duplicate const cases (e.g. same
    operands for "||"), so we do this in llgo for
    now.

Test Plan: lit test added

Reviewers: pcc

Reviewed By: pcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D6831

llvm-svn: 225433
 2015-01-08 07:49:28 +00:00
Andrew Wilkins 75f34af99c [llgo] Elide alloca for unused received values in select 
Summary: If a receive case in a select statement is not assigned to a named variable, then we can eliminate the alloca and copy at runtime.

Test Plan: lit test added

Reviewers: pcc

Reviewed By: pcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D6785

llvm-svn: 225033
 2014-12-31 03:46:49 +00:00
Peter Collingbourne d34d92fb9c irgen: modify the ABI to use init guards instead of priority 
The new ABI is simpler for use cases such as dynamically loaded packages.

The calling convention for import functions is similar to what go/ssa would
produce if BareInits were cleared. However, simply clearing this flag causes
two additional issues:

 1) We would need to special case the 'init$guard' variable (see
    discussion in https://codereview.appspot.com/78780043/).

 2) The call to __go_register_gc_roots needs to appear in the right
    place, i.e. after the guard check. Making this check appear
    in the right place with non-bare inits seems unreliable at best.

So we keep BareInits set and generate the necessary code manually.

It is still possible to get the old ABI by specifying a path to a gccgo
installation.

Differential Revision: http://reviews.llvm.org/D6804

llvm-svn: 225030
 2014-12-31 00:25:39 +00:00
Peter Collingbourne b6edff93ae irgen: do not emit an extra terminator for panic thunks 
Found with GoSmith.

Differential Revision: http://reviews.llvm.org/D6714

llvm-svn: 224904
 2014-12-28 22:39:01 +00:00
Peter Collingbourne 1f89ffdf4d irgen: fix canAvoid* 
Patch by Andrew Wilkins!

canAvoidElementLoad and canAvoidLoad were incorrectly
eliding loads when an index expression is used as an
another array index expression. This led to a panic.

See comments on https://github.com/go-llvm/llgo/issues/175

Test Plan: lit test added

Differential Revision: http://reviews.llvm.org/D6676

llvm-svn: 224420
 2014-12-17 09:45:05 +00:00
Peter Collingbourne ad9841e8ac Initial commit of llgo. 
llvm-svn: 222857
 2014-11-27 00:06:42 +00:00