forked from OSchip/llvm-project
2a721374ae
Following some recent discussions, this changes the representation
of callbrs in IR. The current blockaddress arguments are replaced
with `!` label constraints that refer directly to callbr indirect
destinations:
; Before:
%res = callbr i8* asm "", "=r,r,i"(i8* %x, i8* blockaddress(@test8, %foo))
to label %asm.fallthrough [label %foo]
; After:
%res = callbr i8* asm "", "=r,r,!i"(i8* %x)
to label %asm.fallthrough [label %foo]
The benefit of this is that we can easily update the successors of
a callbr, without having to worry about also updating blockaddress
references. This should allow us to remove some limitations:
* Allow unrolling/peeling/rotation of callbr, or any other
clone-based optimizations
(https://github.com/llvm/llvm-project/issues/41834)
* Allow duplicate successors
(https://github.com/llvm/llvm-project/issues/45248)
This is just the IR representation change though, I will follow up
with patches to remove limtations in various transformation passes
that are no longer needed.
Differential Revision: https://reviews.llvm.org/D129288
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| .. | ||
| CodeGen | ||
| DeLICM | ||
| DeadCodeElimination | ||
| DependenceInfo | ||
| FlattenSchedule | ||
| ForwardOpTree | ||
| GPGPU | ||
| IstAstInfo | ||
| JSONExporter | ||
| MaximalStaticExpansion | ||
| PruneUnprofitable | ||
| ScheduleOptimizer | ||
| ScopDetect | ||
| ScopDetectionDiagnostics | ||
| ScopInfo | ||
| ScopInliner | ||
| Simplify | ||
| Support | ||
| Unit | ||
| UnitIsl | ||
| CMakeLists.txt | ||
| README | ||
| create_ll.sh | ||
| lit.cfg | ||
| lit.site.cfg.in | ||
| polly.ll | ||
| update_check.py | ||
README
place tests here