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Fix PR9960 by teaching SimpleRegisterCoalescing::AdjustCopiesBackFrom() to preserve

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the phikill flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131717 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-05-20 03:54:04 +00:00
parent 074397d75e
commit 21a70bf4a5
2 changed files with 36 additions and 0 deletions
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5
lib/CodeGen/SimpleRegisterCoalescing.cpp
View File

@ -252,7 +252,12 @@ bool SimpleRegisterCoalescing::AdjustCopiesBackFrom(const CoalescerPair &CP,
// Okay, merge "B1" into the same value number as "B0".
if (BValNo != ValLR->valno) {
// If B1 is killed by a PHI, then the merged live range must also be killed
// by the same PHI, as B0 and B1 can not overlap.
bool HasPHIKill = BValNo->hasPHIKill();
IntB.MergeValueNumberInto(BValNo, ValLR->valno);
if (HasPHIKill)
ValLR->valno->setHasPHIKill(true);
}
DEBUG({
dbgs() << " result = ";

31
test/CodeGen/X86/2011-06-19-QuicksortCoalescerBug.ll Normal file
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@ -0,0 +1,31 @@
; RUN: llc < %s -verify-coalescing
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-macosx10.7.0"
define void @Quicksort(i32* %a, i32 %l, i32 %r) nounwind ssp {
entry:
br label %tailrecurse
tailrecurse: ; preds = %do.cond, %entry
%l.tr = phi i32 [ %l, %entry ], [ %i.1, %do.cond ]
%r.tr = phi i32 [ %r, %entry ], [ %l.tr, %do.cond ]
%idxprom12 = sext i32 %r.tr to i64
%arrayidx14 = getelementptr inbounds i32* %a, i64 %idxprom12
br label %do.body
do.body: ; preds = %do.cond, %tailrecurse
%i.0 = phi i32 [ %l.tr, %tailrecurse ], [ %i.1, %do.cond ]
%add7 = add nsw i32 %i.0, 1
%cmp = icmp sgt i32 %add7, %r.tr
br i1 %cmp, label %do.cond, label %if.then
if.then: ; preds = %do.body
store i32 %add7, i32* %arrayidx14, align 4
%add16 = add i32 %i.0, 2
br label %do.cond
do.cond: ; preds = %do.body, %if.then
%i.1 = phi i32 [ %add16, %if.then ], [ %add7, %do.body ]
%cmp19 = icmp sgt i32 %i.1, %r.tr
br i1 %cmp19, label %tailrecurse, label %do.body
}