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llvm-6502/test/Transforms/IndVarSimplify/2011-11-17-selfphi.ll

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Fix an overly general check in SimplifyIndvar to handle useless phi cycles. The right way to check for a binary operation is cast<BinaryOperator>. The original check: cast<Instruction> && numOperands() == 2 would match phi "instructions", leading to an infinite loop in extreme corner case: a useless phi with operands [self, constant] that prior optimization passes failed to remove, being used in the loop by another useless phi, in turn being used by an lshr or udiv. Fixes PR11350: runaway iteration assertion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144935 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-17 23:36:35 +00:00
; RUN: opt < %s -indvars -S | FileCheck %s
; PR11350: Check that SimplifyIndvar handles a cycle of useless self-phis.
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186268 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-14 01:42:54 +00:00
; CHECK-LABEL: @test(
Fix an overly general check in SimplifyIndvar to handle useless phi cycles. The right way to check for a binary operation is cast<BinaryOperator>. The original check: cast<Instruction> && numOperands() == 2 would match phi "instructions", leading to an infinite loop in extreme corner case: a useless phi with operands [self, constant] that prior optimization passes failed to remove, being used in the loop by another useless phi, in turn being used by an lshr or udiv. Fixes PR11350: runaway iteration assertion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144935 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-17 23:36:35 +00:00
; CHECK-NOT: lcssa = phi
define void @test() nounwind {
entry:
br label %for.cond.preheader
for.cond.preheader: ; preds = %entry
br label %for.cond.outer
for.cond.outer: ; preds = %for.cond.preheader, %for.end
%p_41.addr.0.ph = phi i32 [ %p_41.addr.1.lcssa, %for.end ], [ 1, %for.cond.preheader ]
br label %for.cond
for.cond:
br i1 true, label %for.end, label %for.ph
for.ph: ; preds = %for.cond4.preheader
br label %for.end
for.end:
%p_41.addr.1.lcssa = phi i32 [ undef, %for.ph ], [ %p_41.addr.0.ph, %for.cond ]
%p_68.lobit.i = lshr i32 %p_41.addr.1.lcssa, 31
%cmp7 = icmp eq i32 %p_41.addr.1.lcssa, 0
%conv8 = zext i1 %cmp7 to i32
br label %for.cond.outer
}
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