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Commit some changes I had managed to lose last night while refactoring the code. Avoid change use of PHI instructions because it's not legal to insert any instructions before them.

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This fixes PR6027.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93335 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-01-13 19:16:39 +00:00
parent 656bb20d61
commit eb18812f75
3 changed files with 53 additions and 2 deletions
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7
lib/CodeGen/OptimizeExts.cpp
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@ -110,6 +110,11 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB,
MachineInstr *UseMI = &*UI;
if (UseMI == MI)
continue;
if (UseMI->getOpcode() == TargetInstrInfo::PHI) {
ExtendLife = false;
continue;
}
MachineBasicBlock *UseMBB = UseMI->getParent();
if (UseMBB == MBB) {
// Local uses that come after the extension.
@ -117,7 +122,7 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB,
Uses.push_back(&UseMO);
} else if (ReachedBBs.count(UseMBB))
// Non-local uses where the result of extension is used. Always
// replace these.
// replace these unless it's a PHI.
Uses.push_back(&UseMO);
else if (Aggressive && DT->dominates(MBB, UseMBB))
// We may want to extend live range of the extension result in order

46
test/CodeGen/X86/2010-01-13-OptExtBug.ll Normal file
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@ -0,0 +1,46 @@
; RUN: llc < %s -mtriple=i386-pc-linux-gnu
; PR6027
%class.OlsonTimeZone = type { i16, i32*, i8*, i16 }
define void @XX(%class.OlsonTimeZone* %this) align 2 {
entry:
%call = tail call i8* @_Z15uprv_malloc_4_2v()
%0 = bitcast i8* %call to double*
%tmp = getelementptr inbounds %class.OlsonTimeZone* %this, i32 0, i32 3
%tmp2 = load i16* %tmp
%tmp525 = getelementptr inbounds %class.OlsonTimeZone* %this, i32 0, i32 0
%tmp626 = load i16* %tmp525
%cmp27 = icmp slt i16 %tmp2, %tmp626
br i1 %cmp27, label %bb.nph, label %for.end
for.cond:
%tmp6 = load i16* %tmp5
%cmp = icmp slt i16 %inc, %tmp6
%indvar.next = add i32 %indvar, 1
br i1 %cmp, label %for.body, label %for.end
bb.nph:
%tmp10 = getelementptr inbounds %class.OlsonTimeZone* %this, i32 0, i32 2
%tmp17 = getelementptr inbounds %class.OlsonTimeZone* %this, i32 0, i32 1
%tmp5 = getelementptr inbounds %class.OlsonTimeZone* %this, i32 0, i32 0
%tmp29 = sext i16 %tmp2 to i32
%tmp31 = add i16 %tmp2, 1
%tmp32 = zext i16 %tmp31 to i32
br label %for.body
for.body:
%indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %for.cond ]
%tmp30 = add i32 %indvar, %tmp29
%tmp33 = add i32 %indvar, %tmp32
%inc = trunc i32 %tmp33 to i16
%tmp11 = load i8** %tmp10
%arrayidx = getelementptr i8* %tmp11, i32 %tmp30
%tmp12 = load i8* %arrayidx
br label %for.cond
for.end:
ret void
}
declare i8* @_Z15uprv_malloc_4_2v()

2
test/CodeGen/X86/stack-color-with-reg.ll
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@ -1,5 +1,5 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 -relocation-model=pic -disable-fp-elim -color-ss-with-regs -stats -info-output-file - > %t
; RUN: grep stackcoloring %t | grep "stack slot refs replaced with reg refs" | grep 9
; RUN: grep stackcoloring %t | grep "stack slot refs replaced with reg refs" | grep 14
type { [62 x %struct.Bitvec*] } ; type %0
type { i8* } ; type %1