From: Dan Gohman <gohman@apple.com>
Date: Sun, 24 May 2009 19:11:38 +0000 (+0000)
Subject: When rewriting the loop exit test with the canonical induction variable,
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=95bdbfa0668cc2b475429fbc6046f364bc01edf7;p=oota-llvm.git

When rewriting the loop exit test with the canonical induction variable,
leave the original comparison in place if it has other uses, since the
other uses won't be dominated by the new comparison instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72369 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index f20d424724a..07c7d0071fb 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -187,7 +187,12 @@ ICmpInst *IndVarSimplify::LinearFunctionTestReplace(Loop *L,
   ICmpInst *Cond = new ICmpInst(Opcode, CmpIndVar, ExitCnt, "exitcond", BI);
 
   Instruction *OrigCond = cast<Instruction>(BI->getCondition());
-  OrigCond->replaceAllUsesWith(Cond);
+  // It's tempting to use replaceAllUsesWith here to fully replace the old
+  // comparison, but that's not immediately safe, since users of the old
+  // comparison may not be dominated by the new comparison. Instead, just
+  // update the branch to use the new comparison; in the common case this
+  // will make old comparison dead.
+  BI->setCondition(Cond);
   RecursivelyDeleteTriviallyDeadInstructions(OrigCond);
 
   ++NumLFTR;
diff --git a/test/Transforms/IndVarSimplify/lftr-other-uses.ll b/test/Transforms/IndVarSimplify/lftr-other-uses.ll
new file mode 100644
index 00000000000..c8f1e959834
--- /dev/null
+++ b/test/Transforms/IndVarSimplify/lftr-other-uses.ll
@@ -0,0 +1,36 @@
+; RUN: llvm-as < %s | opt -indvars -disable-output
+
+; Don't RAUW the loop's original comparison instruction if it has
+; other uses which aren't dominated by the new comparison instruction.
+
+	%struct.DecRefPicMarking_s = type { i32, i32, i32, i32, i32, %struct.DecRefPicMarking_s* }
+	%struct.datapartition = type { %typedef.Bitstream*, %typedef.DecodingEnvironment, i32 (%struct.syntaxelement*, %struct.img_par*, %struct.inp_par*, %struct.datapartition*)* }
+	%struct.img_par = type { i32, i32, i32, i32, i32*, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [16 x [16 x i16]], [6 x [32 x i32]], [16 x [16 x i32]], [4 x [12 x [4 x [4 x i32]]]], [16 x i32], i32**, i32*, i32***, i32**, i32, i32, i32, i32, %typedef.Slice*, %struct.macroblock*, i32, i32, i32, i32, i32, i32, i32**, %struct.DecRefPicMarking_s*, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [3 x i32], i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32***, i32***, i32****, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, %struct.timeb, %struct.timeb, i32, i32, i32, i32, i32, i32, i32, i32 }
+	%struct.inp_par = type { [100 x i8], [100 x i8], [100 x i8], i32, i32, i32, i32, i32, i32, i32 }
+	%struct.macroblock = type { i32, i32, i32, %struct.macroblock*, %struct.macroblock*, i32, [2 x [4 x [4 x [2 x i32]]]], i32, i64, i64, i32, i32, [4 x i32], [4 x i32], i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32 }
+	%struct.syntaxelement = type { i32, i32, i32, i32, i32, i32, i32, i32, void (i32, i32, i32*, i32*)*, void (%struct.syntaxelement*, %struct.inp_par*, %struct.img_par*, %typedef.DecodingEnvironment*)* }
+	%struct.timeb = type { i32, i16, i16, i16 }
+	%typedef.BiContextType = type { i16, i8 }
+	%typedef.Bitstream = type { i32, i32, i32, i32, i8*, i32 }
+	%typedef.DecodingEnvironment = type { i32, i32, i32, i32, i32, i8*, i32* }
+	%typedef.MotionInfoContexts = type { [4 x [11 x %typedef.BiContextType]], [2 x [9 x %typedef.BiContextType]], [2 x [10 x %typedef.BiContextType]], [2 x [6 x %typedef.BiContextType]], [4 x %typedef.BiContextType], [4 x %typedef.BiContextType], [3 x %typedef.BiContextType] }
+	%typedef.Slice = type { i32, i32, i32, i32, i32, i32, i32, i32, i32, %struct.datapartition*, %typedef.MotionInfoContexts*, %typedef.TextureInfoContexts*, i32, i32*, i32*, i32*, i32, i32*, i32*, i32*, i32 (%struct.img_par*, %struct.inp_par*)*, i32, i32, i32, i32 }
+	%typedef.TextureInfoContexts = type { [2 x %typedef.BiContextType], [4 x %typedef.BiContextType], [3 x [4 x %typedef.BiContextType]], [10 x [4 x %typedef.BiContextType]], [10 x [15 x %typedef.BiContextType]], [10 x [15 x %typedef.BiContextType]], [10 x [5 x %typedef.BiContextType]], [10 x [5 x %typedef.BiContextType]], [10 x [15 x %typedef.BiContextType]], [10 x [15 x %typedef.BiContextType]] }
+
+define void @readCBP_CABAC(%struct.syntaxelement* %se, %struct.inp_par* %inp, %struct.img_par* %img.1, %typedef.DecodingEnvironment* %dep_dp) {
+entry:
+	br label %loopentry.0
+
+loopentry.0:		; preds = %loopentry.1, %entry
+	%mb_y.0 = phi i32 [ 0, %entry ], [ %tmp.152, %loopentry.1 ]		; <i32> [#uses=2]
+	%tmp.14 = icmp sle i32 %mb_y.0, 3		; <i1> [#uses=2]
+	%tmp.15 = zext i1 %tmp.14 to i32		; <i32> [#uses=0]
+	br i1 %tmp.14, label %loopentry.1, label %loopexit.0
+
+loopentry.1:		; preds = %loopentry.0
+	%tmp.152 = add i32 %mb_y.0, 2		; <i32> [#uses=1]
+	br label %loopentry.0
+
+loopexit.0:		; preds = %loopentry.0
+	unreachable
+}