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s390x: Refactor branch and jumptable emission

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The BranchTarget abstraction is no longer needed, since all branches are
being emitted using a MachLabel target.  Remove BranchTarget and simply
use MachLabel everywhere a branch target is required.  (This brings the
s390x back-end in line with what x64 does as well.)

In addition, simplify jumptable emission by moving all instructions
that do not depend on the internal label (i.e. the conditional branch
to the default label, as well as the scaling the index register) out of
the combined JTSequence instruction.

This refactoring will make moving branch generation to ISLE easier.
This commit is contained in:
Ulrich Weigand
2022-01-24 12:03:59 +01:00
parent 881c19473d
commit cee00c6591
10 changed files with 731 additions and 870 deletions
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cranelift/codegen/src/isa/s390x/lower/isle/generated_code.manifest
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src/clif.isle f176ef3bba99365
src/prelude.isle 51d2aef2566c1c96
src/isa/s390x/inst.isle 63cf833b5cfd727d
src/isa/s390x/inst.isle 17b77476355c4509
src/isa/s390x/lower.isle a0e21a567040bc33