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Correctly update kill infos after extending a live range and merge 2 val#'s; fix 56165 - do not mark val# copy field if the copy does not define the val#.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56199 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-09-15 06:28:41 +00:00
parent 206b59acf0
commit 25f34a30d6
2 changed files with 37 additions and 3 deletions
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9
lib/CodeGen/SimpleRegisterCoalescing.cpp
View File

@ -182,16 +182,20 @@ bool SimpleRegisterCoalescing::AdjustCopiesBackFrom(LiveInterval &IntA,
}
// Okay, merge "B1" into the same value number as "B0".
if (BValNo != ValLR->valno)
if (BValNo != ValLR->valno) {
IntB.addKills(ValLR->valno, BValNo->kills);
IntB.MergeValueNumberInto(BValNo, ValLR->valno);
}
DOUT << " result = "; IntB.print(DOUT, tri_);
DOUT << "\n";
// If the source instruction was killing the source register before the
// merge, unset the isKill marker given the live range has been extended.
int UIdx = ValLREndInst->findRegisterUseOperandIdx(IntB.reg, true);
if (UIdx != -1)
if (UIdx != -1) {
ValLREndInst->getOperand(UIdx).setIsKill(false);
IntB.removeKill(ValLR->valno, FillerStart);
}
++numExtends;
return true;
@ -568,6 +572,7 @@ SimpleRegisterCoalescing::UpdateRegDefsUses(unsigned SrcReg, unsigned DstReg,
LiveInterval &LI = li_->getInterval(CopyDstReg);
unsigned DefIdx = li_->getDefIndex(li_->getInstructionIndex(UseMI));
const LiveRange *DLR = LI.getLiveRangeContaining(DefIdx);
if (DLR->valno->def == DefIdx)
DLR->valno->copy = UseMI;
}
}

29
test/CodeGen/ARM/2008-09-14-CoaleserBug.ll Normal file
View File

@ -0,0 +1,29 @@
; RUN: llvm-as < %s | llc -mtriple=arm-apple-darwin
@"\01LC1" = external constant [288 x i8] ; <[288 x i8]*> [#uses=1]
declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind
define i32 @main(i32 %argc, i8** %argv) nounwind {
entry:
br label %bb.i
bb.i: ; preds = %bb.i, %entry
%i.01.i = phi i32 [ 0, %entry ], [ %indvar.next52, %bb.i ] ; <i32> [#uses=1]
%indvar.next52 = add i32 %i.01.i, 1 ; <i32> [#uses=2]
%exitcond53 = icmp eq i32 %indvar.next52, 15 ; <i1> [#uses=1]
br i1 %exitcond53, label %bb.i33.loopexit, label %bb.i
bb.i33.loopexit: ; preds = %bb.i
%0 = malloc [347 x i8] ; <[347 x i8]*> [#uses=2]
%.sub = getelementptr [347 x i8]* %0, i32 0, i32 0 ; <i8*> [#uses=1]
call void @llvm.memcpy.i32( i8* %.sub, i8* getelementptr ([288 x i8]* @"\01LC1", i32 0, i32 0), i32 287, i32 1 ) nounwind
br label %bb.i28
bb.i28: ; preds = %bb.i28, %bb.i33.loopexit
br i1 false, label %repeat_fasta.exit, label %bb.i28
repeat_fasta.exit: ; preds = %bb.i28
free [347 x i8]* %0
unreachable
}