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[Mips] Conditionally remove successor block

Browse Source 
In MipsBranchExpansion::splitMBB, upon splitting
a block with two direct branches, remove the successor
of the newly created block (which inherits successors from
the original block) which is pointed to by the last
branch in the original block only if the targets of two
branches differ.

This is to fix the failing test when ran with
-verify-machineinstrs enabled.

Differential Revision: https://reviews.llvm.org/D53756

llvm-svn: 345821
This commit is contained in:
Stefan Maksimovic 2018-11-01 10:10:42 +00:00
parent 0d47c0b0a8
commit 215f4806d8
2 changed files with 4 additions and 3 deletions
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3
lib/Target/Mips/MipsBranchExpansion.cpp
View File

@ -271,7 +271,8 @@ void MipsBranchExpansion::splitMBB(MachineBasicBlock *MBB) {
// Insert NewMBB and fix control flow.
MachineBasicBlock *Tgt = getTargetMBB(*FirstBr);
NewMBB->transferSuccessors(MBB);
NewMBB->removeSuccessor(Tgt, true);
if (Tgt != getTargetMBB(*LastBr))
NewMBB->removeSuccessor(Tgt, true);
MBB->addSuccessor(NewMBB);
MBB->addSuccessor(Tgt);
MFp->insert(std::next(MachineFunction::iterator(MBB)), NewMBB);

4
test/CodeGen/Mips/micromips-mtc-mfc.ll
View File

@ -1,7 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=mips -mcpu=mips32r2 -mattr=+micromips \
; RUN: llc -mtriple=mips -mcpu=mips32r2 -mattr=+micromips -verify-machineinstrs \
; RUN: -show-mc-encoding < %s | FileCheck --check-prefix=MM2 %s
; RUN: llc -mtriple=mips -mcpu=mips32r6 -mattr=+micromips \
; RUN: llc -mtriple=mips -mcpu=mips32r6 -mattr=+micromips -verify-machineinstrs \
; RUN: -show-mc-encoding < %s | FileCheck --check-prefix=MM6 %s
define double @foo(double %a, double %b) {