35 lines
1008 B
LLVM
35 lines
1008 B
LLVM
; RUN: opt < %s -analyze -iv-users
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; RUN: opt < %s -passes='print<ivusers>'
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; PR9633: Tests that SCEV handles the mul.i2 recurrence being folded to
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; constant zero.
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define signext i8 @func_14(i8 signext %p_18) nounwind readnone ssp {
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entry:
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br label %for.inc
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for.inc:
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%p_17.addr.012 = phi i32 [ 0, %entry ], [ %add, %for.inc ]
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%add = add nsw i32 %p_17.addr.012, 1
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br i1 false, label %for.inc, label %for.cond
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for.cond:
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%tobool.i = icmp ult i32 %add, 8192
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%shl.i = select i1 %tobool.i, i32 13, i32 0
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%shl.left.i = shl i32 %add, %shl.i
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%conv.i4 = trunc i32 %shl.left.i to i8
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br i1 undef, label %for.inc9, label %if.then
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for.inc9:
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%p_18.addr.011 = phi i8 [ %add12, %for.inc9 ], [ %p_18, %for.cond ]
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%add12 = add i8 %p_18.addr.011, 1
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%mul.i2 = mul i8 %add12, %conv.i4
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%mul.i2.lobit = lshr i8 %mul.i2, 7
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%lor.ext.shr.i = select i1 undef, i8 %mul.i2.lobit, i8 %mul.i2
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%tobool = icmp eq i8 %lor.ext.shr.i, 0
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br i1 %tobool, label %for.inc9, label %if.then
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if.then:
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ret i8 0
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}
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