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[CodeGen][TargetPassConfig] Add unreachable-mbb-elimination pass explicitly

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Differential revision: https://reviews.llvm.org/D84228
This commit is contained in:
Evgeny Leviant 2020-07-23 18:05:11 +03:00
parent 8d05b090aa
commit 355534b549
2 changed files with 10 additions and 0 deletions
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5
lib/CodeGen/TargetPassConfig.cpp
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@ -1183,6 +1183,11 @@ void TargetPassConfig::addOptimizedRegAlloc() {
// LiveVariables can be removed completely, and LiveIntervals can be directly
// computed. (We still either need to regenerate kill flags after regalloc, or
// preferably fix the scavenger to not depend on them).
// FIXME: UnreachableMachineBlockElim is a dependant pass of LiveVariables.
// When LiveVariables is removed this has to be removed/moved either.
// Explicit addition of UnreachableMachineBlockElim allows stopping before or
// after it with -stop-before/-stop-after.
addPass(&UnreachableMachineBlockElimID, false);
addPass(&LiveVariablesID, false);
// Edge splitting is smarter with machine loop info.

5
test/CodeGen/AArch64/partial-pipeline-execution.ll
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@ -7,6 +7,11 @@
; optimize the loop differently
; RUN: cmp %t.s %t2.s
; Check that we can do the same with unreachable-mbb-elimination pass
; RUN: llc -O3 -stop-after=unreachable-mbb-elimination %s -o %t-mbb-elim.mir
; RUN: llc -O3 -start-after=unreachable-mbb-elimination %t-mbb-elim.mir -o %t3.s
; RUN: cmp %t.s %t3.s
; ModuleID = 'loop.c'
source_filename = "loop.c"
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"