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Subreg live interval valno may not have a corresponding def machineinstr since it's less precise.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53734 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-07-17 19:48:53 +00:00
parent d1718252b5
commit 76a4d58998
2 changed files with 35 additions and 1 deletions
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2
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1327,7 +1327,7 @@ bool SimpleRegisterCoalescing::RangeIsDefinedByCopyFromReg(LiveInterval &li,
// Re-compute it.
MachineInstr *DefMI = li_->getInstructionFromIndex(LR->start);
unsigned SrcReg, DstReg;
if (tii_->isMoveInstr(*DefMI, SrcReg, DstReg) &&
if (DefMI && tii_->isMoveInstr(*DefMI, SrcReg, DstReg) &&
DstReg == li.reg && SrcReg == Reg) {
// Cache computed info.
LR->valno->def = LR->start;

34
test/CodeGen/X86/2008-07-16-CoalescerCrash.ll Normal file
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@ -0,0 +1,34 @@
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin
%struct.SV = type { i8*, i64, i64 }
@"\01LC25" = external constant [8 x i8] ; <[8 x i8]*> [#uses=1]
declare void @Perl_sv_catpvf(%struct.SV*, i8*, ...) nounwind
declare fastcc i64 @Perl_utf8n_to_uvuni(i8*, i64, i64*, i64) nounwind
define fastcc i8* @Perl_pv_uni_display(%struct.SV* %dsv, i8* %spv, i64 %len, i64 %pvlim, i64 %flags) nounwind {
entry:
br i1 false, label %bb, label %bb40
bb: ; preds = %entry
tail call fastcc i64 @Perl_utf8n_to_uvuni( i8* null, i64 13, i64* null, i64 255 ) nounwind ; <i64>:0 [#uses=1]
br i1 false, label %bb6, label %bb33
bb6: ; preds = %bb
br i1 false, label %bb30, label %bb31
bb30: ; preds = %bb6
unreachable
bb31: ; preds = %bb6
icmp eq i8 0, 0 ; <i1>:1 [#uses=0]
br label %bb33
bb33: ; preds = %bb31, %bb
tail call void (%struct.SV*, i8*, ...)* @Perl_sv_catpvf( %struct.SV* %dsv, i8* getelementptr ([8 x i8]* @"\01LC25", i32 0, i64 0), i64 %0 ) nounwind
unreachable
bb40: ; preds = %entry
ret i8* null
}