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Fix a crash when building 177.mesa for armv6. 

When splitting a live range immediately before an LDR_POST instruction
that redefines the address register, make sure to use the correct value
number in leaveIntvBefore.

We need the value number entering the instruction.

<rdar://problem/9793765>

llvm-svn: 135413
This commit is contained in:
Jakob Stoklund Olesen 2011-07-18 18:47:13 +00:00
parent 494c549ebd
commit c45d38e14a
2 changed files with 33 additions and 1 deletions
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2
llvm/lib/CodeGen/SplitKit.cpp
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@ -730,7 +730,7 @@ SlotIndex SplitEditor::leaveIntvBefore(SlotIndex Idx) {
DEBUG(dbgs() << " leaveIntvBefore " << Idx);
// The interval must be live into the instruction at Idx.
Idx = Idx.getBoundaryIndex();
Idx = Idx.getBaseIndex();
VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Idx);
if (!ParentVNI) {
DEBUG(dbgs() << ": not live\n");

32
llvm/test/CodeGen/ARM/crash-greedy-v6.ll Normal file
View File

@ -0,0 +1,32 @@
; RUN: llc -disable-fp-elim -relocation-model=pic < %s
target triple = "armv6-apple-ios"
; Reduced from 177.mesa. This test causes a live range split before an LDR_POST instruction.
; That requires leaveIntvBefore to be very accurate about the redefined value number.
define internal void @sample_nearest_3d(i8* nocapture %tObj, i32 %n, float* nocapture %s, float* nocapture %t, float* nocapture %u, float* nocapture %lambda, i8* nocapture %red, i8* nocapture %green, i8* nocapture %blue, i8* nocapture %alpha) nounwind ssp {
entry:
br i1 undef, label %for.end, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body, %for.body.lr.ph
%i.031 = phi i32 [ 0, %for.body.lr.ph ], [ %0, %for.body ]
%arrayidx11 = getelementptr float* %t, i32 %i.031
%arrayidx15 = getelementptr float* %u, i32 %i.031
%arrayidx19 = getelementptr i8* %red, i32 %i.031
%arrayidx22 = getelementptr i8* %green, i32 %i.031
%arrayidx25 = getelementptr i8* %blue, i32 %i.031
%arrayidx28 = getelementptr i8* %alpha, i32 %i.031
%tmp12 = load float* %arrayidx11, align 4
tail call fastcc void @sample_3d_nearest(i8* %tObj, i8* undef, float undef, float %tmp12, float undef, i8* %arrayidx19, i8* %arrayidx22, i8* %arrayidx25, i8* %arrayidx28)
%0 = add i32 %i.031, 1
%exitcond = icmp eq i32 %0, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
declare fastcc void @sample_3d_nearest(i8* nocapture, i8* nocapture, float, float, float, i8* nocapture, i8* nocapture, i8* nocapture, i8* nocapture) nounwind ssp