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Fix PR 18369: [Thumbv8] asserts due to inconsistent CPSR liveness of IT blocks

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The issue is caused when Post-RA scheduler reorders a bundle instruction
(IT block). However, it only flips the CPSR liveness of the bundle instruction,
leaves the instructions inside the bundle unchanged, which causes inconstancy and crashes
Thumb2SizeReduction.cpp::ReduceMBB().


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199127 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Weiming Zhao 2014-01-13 18:47:54 +00:00
parent 99c7fec2c9
commit 436f2975ac
2 changed files with 25 additions and 0 deletions
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3
lib/Target/ARM/Thumb2SizeReduction.cpp
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@ -980,6 +980,9 @@ bool Thumb2SizeReduce::ReduceMBB(MachineBasicBlock &MBB) {
MachineOperand *MO = BundleMI->findRegisterDefOperand(ARM::CPSR);
if (MO && !MO->isDead())
LiveCPSR = true;
MO = BundleMI->findRegisterUseOperand(ARM::CPSR);
if (MO && !MO->isKill())
LiveCPSR = true;
}
bool DefCPSR = false;

22
test/CodeGen/Thumb2/2011-12-16-T2SizeReduceAssert.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -mtriple=thumbv7-apple-ios -relocation-model=pic -disable-fp-elim -mcpu=cortex-a8
; RUN: llc < %s -mtriple=thumbv8-none-linux-gnueabi | FileCheck %s
%struct.LIST_NODE.0.16 = type { %struct.LIST_NODE.0.16*, i8* }
@ -26,3 +27,24 @@ bb3: ; preds = %bb2, %entry
bb5: ; preds = %bb3, %bb
ret %struct.LIST_NODE.0.16* null
}
declare void @use(i32)
define double @find_max_double(i32 %n, double* nocapture readonly %aa) {
entry:
;CHECK-LABEL: find_max_double:
br i1 undef, label %for.body, label %for.end
for.body: ; preds = %for.body, %entry
%0 = load double* null, align 8
%cmp2.6 = fcmp ogt double %0, 0.000000e+00
%idx.1.6 = select i1 %cmp2.6, i32 undef, i32 0
%idx.1.7 = select i1 undef, i32 undef, i32 %idx.1.6
%max.1.7 = select i1 undef, double 0.000000e+00, double undef
br i1 undef, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
%max.0.lcssa = phi double [ undef, %entry ], [ %max.1.7, %for.body ]
%idx.0.lcssa = phi i32 [ 0, %entry ], [ %idx.1.7, %for.body ]
tail call void @use(i32 %idx.0.lcssa)
ret double %max.0.lcssa
}