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34a44fe737
Summary:
Previously the case
EBB
| \_
| |
| TBB
| /
FBB
was treated as a valid triangle also when TBB and FBB was the same basic
block. This could then lead to an invalid CFG when we removed the edge
from EBB to TBB, since that meant we would also remove the edge from EBB
to FBB.
Since TBB == FBB is quite a degenerated case of a triangle, we now
don't treat it as a valid triangle anymore, and thus we will avoid the
trouble with updating the CFG.
Reviewers: efriedma, dmgreen, kparzysz
Reviewed By: efriedma
Subscribers: bjope, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D67832
llvm-svn: 372943
30 lines
606 B
YAML
30 lines
606 B
YAML
# RUN: llc -mtriple=arm-apple-ios -run-pass=if-converter -verify-machineinstrs %s -o - | FileCheck %s
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...
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---
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name: foo
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body: |
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bb.0:
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Bcc %bb.2, 1, $cpsr
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bb.1:
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$sp = tADDspi $sp, 2, 14, _
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B %bb.1
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bb.2:
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Bcc %bb.3, 0, $cpsr
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B %bb.2
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bb.3:
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Bcc %bb.1, 1, $cpsr
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B %bb.1
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...
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# Both branches in bb.3 jump to bb.1. IfConversion shouldn't treat this as a
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# tringle and insert the tADDspi in bb3, but leave it as it is.
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# CHECK: bb.3:
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# CHECK: successors: %bb.1
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# CHECK-NOT: tADDspi
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# CHECK: Bcc %bb.1, 1, $cpsr
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# CHECK: B %bb.1
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