181 lines
7.5 KiB
LLVM
181 lines
7.5 KiB
LLVM
; RUN: opt -S < %s -passes='print<scalar-evolution>,loop-simplify,print<scalar-evolution>' 2>&1 | FileCheck %s
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; Provide legal integer types.
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target datalayout = "n8:16:32:64"
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@maxStat = external global i32
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; LoopSimplify should invalidate SCEV when splitting out the
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; inner loop.
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;
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; First SCEV print:
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; CHECK-LABEL: Classifying expressions for: @test
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; CHECK: %[[PHI:.*]] = phi i32 [ 0, %entry ], [ %{{.*}}, %if.then5 ], [ %[[PHI]], %if.end ]
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; CHECK-LABEL: Determining loop execution counts for: @test
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; CHECK: Loop %for.body18: Unpredictable backedge-taken count.
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; CHECK: Loop %for.body18: max backedge-taken count is 2147483646
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; CHECK: Loop %for.body18: Unpredictable predicated backedge-taken count.
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; CHECK: Loop %for.cond: <multiple exits> Unpredictable backedge-taken count.
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; CHECK: Loop %for.cond: Unpredictable max backedge-taken count.
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; CHECK: Loop %for.cond: Unpredictable predicated backedge-taken count.
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;
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; Now simplify the loop, which should cause SCEV to re-compute more precise
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; info here in addition to having preheader PHIs. Second SCEV print:
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; CHECK-LABEL: Classifying expressions for: @test
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; CHECK: phi i32 [ %{{.*}}, %if.then5 ], [ 0, %entry ]
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; CHECK-LABEL: Determining loop execution counts for: @test
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; CHECK: Loop %for.body18: Unpredictable backedge-taken count.
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; CHECK: Loop %for.body18: max backedge-taken count is 2147483646
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; CHECK: Loop %for.body18: Unpredictable predicated backedge-taken count.
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; CHECK: Loop %for.cond: <multiple exits> Unpredictable backedge-taken count.
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; CHECK: Loop %for.cond: max backedge-taken count is -2147483647
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; CHECK: Loop %for.cond: Unpredictable predicated backedge-taken count.
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; CHECK: Loop %for.cond.outer: <multiple exits> Unpredictable backedge-taken count.
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; CHECK: Loop %for.cond.outer: Unpredictable max backedge-taken count.
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; CHECK: Loop %for.cond.outer: Unpredictable predicated backedge-taken count.
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define i32 @test() nounwind {
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entry:
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br label %for.cond
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for.cond: ; preds = %if.then5, %if.end, %entry
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%cuts.1 = phi i32 [ 0, %entry ], [ %inc, %if.then5 ], [ %cuts.1, %if.end ]
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%0 = phi i32 [ 0, %entry ], [ %add, %if.end ], [ %add, %if.then5 ]
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%add = add i32 %0, 1
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%cmp = icmp slt i32 %0, 1
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%tmp1 = load i32, i32* @maxStat, align 4
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br i1 %cmp, label %for.body, label %for.cond14.preheader
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for.cond14.preheader: ; preds = %for.cond
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%cmp1726 = icmp sgt i32 %tmp1, 0
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br i1 %cmp1726, label %for.body18, label %return
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for.body: ; preds = %for.cond
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%cmp2 = icmp sgt i32 %tmp1, 100
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br i1 %cmp2, label %return, label %if.end
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if.end: ; preds = %for.body
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%cmp4 = icmp sgt i32 %tmp1, -1
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br i1 %cmp4, label %if.then5, label %for.cond
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if.then5: ; preds = %if.end
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call void @foo() nounwind
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%inc = add i32 %cuts.1, 1
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br label %for.cond
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for.body18: ; preds = %for.body18, %for.cond14.preheader
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%i13.027 = phi i32 [ %1, %for.body18 ], [ 0, %for.cond14.preheader ]
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call void @foo() nounwind
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%1 = add nsw i32 %i13.027, 1
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%tmp16 = load i32, i32* @maxStat, align 4
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%cmp17 = icmp slt i32 %1, %tmp16
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br i1 %cmp17, label %for.body18, label %return
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return: ; preds = %for.body18, %for.body, %for.cond14.preheader
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ret i32 0
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}
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declare void @foo() nounwind
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; Notify SCEV when removing an ExitingBlock. This only changes the
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; backedge-taken information.
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;
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; First SCEV print:
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; CHECK-LABEL: Determining loop execution counts for: @mergeExit
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; CHECK: Loop %while.cond191: <multiple exits> Unpredictable backedge-taken count.
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; CHECK: Loop %while.cond191: max backedge-taken count is -1
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; CHECK: Loop %while.cond191: Unpredictable predicated backedge-taken count.
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; CHECK: Loop %while.cond191.outer: <multiple exits> Unpredictable backedge-taken count.
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; CHECK: Loop %while.cond191.outer: Unpredictable max backedge-taken count.
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; CHECK: Loop %while.cond191.outer: Unpredictable predicated backedge-taken count.
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;
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; After simplifying, the max backedge count is refined.
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; Second SCEV print:
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; CHECK-LABEL: Determining loop execution counts for: @mergeExit
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; CHECK: Loop %while.cond191: <multiple exits> backedge-taken count is 0
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; CHECK: Loop %while.cond191: max backedge-taken count is 0
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; CHECK: Loop %while.cond191: Predicated backedge-taken count is 0
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; CHECK: Loop %while.cond191.outer: <multiple exits> Unpredictable backedge-taken count.
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; CHECK: Loop %while.cond191.outer: max backedge-taken count is false
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; CHECK: Loop %while.cond191.outer: Unpredictable predicated backedge-taken count.
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define void @mergeExit(i32 %MapAttrCount) nounwind uwtable ssp {
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entry:
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br i1 undef, label %if.then124, label %if.end126
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if.then124: ; preds = %entry
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unreachable
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if.end126: ; preds = %entry
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br i1 undef, label %while.body.lr.ph, label %if.end591
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while.body.lr.ph: ; preds = %if.end126
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br i1 undef, label %if.end140, label %if.then137
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if.then137: ; preds = %while.body.lr.ph
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unreachable
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if.end140: ; preds = %while.body.lr.ph
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br i1 undef, label %while.cond191.outer, label %if.then148
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if.then148: ; preds = %if.end140
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unreachable
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while.cond191.outer: ; preds = %if.then205, %if.end140
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br label %while.cond191
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while.cond191: ; preds = %while.body197, %while.cond191.outer
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%CppIndex.0 = phi i32 [ %inc, %while.body197 ], [ undef, %while.cond191.outer ]
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br i1 undef, label %land.rhs, label %if.then216
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land.rhs: ; preds = %while.cond191
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%inc = add i32 %CppIndex.0, 1
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%cmp196 = icmp ult i32 %inc, %MapAttrCount
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br i1 %cmp196, label %while.body197, label %if.then216
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while.body197: ; preds = %land.rhs
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br i1 undef, label %if.then205, label %while.cond191
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if.then205: ; preds = %while.body197
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br label %while.cond191.outer
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if.then216: ; preds = %land.rhs, %while.cond191
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br i1 undef, label %if.else, label %if.then221
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if.then221: ; preds = %if.then216
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unreachable
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if.else: ; preds = %if.then216
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br i1 undef, label %if.then266, label %if.end340
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if.then266: ; preds = %if.else
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switch i32 undef, label %if.else329 [
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i32 17, label %if.then285
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i32 19, label %if.then285
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i32 18, label %if.then285
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i32 15, label %if.then285
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]
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if.then285: ; preds = %if.then266, %if.then266, %if.then266, %if.then266
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br i1 undef, label %if.then317, label %if.else324
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if.then317: ; preds = %if.then285
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br label %if.end340
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if.else324: ; preds = %if.then285
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unreachable
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if.else329: ; preds = %if.then266
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unreachable
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if.end340: ; preds = %if.then317, %if.else
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unreachable
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if.end591: ; preds = %if.end126
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br i1 undef, label %cond.end, label %cond.false
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cond.false: ; preds = %if.end591
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unreachable
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cond.end: ; preds = %if.end591
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ret void
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}
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