8b5b294ec2
When printing the result of SCEV's analysis, we can avoid printing the predicated backedge taken count and the predicates if the predicates are empty and no new information is provided. This helps to reduce the verbosity of the output.
76 lines
4.8 KiB
LLVM
76 lines
4.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
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; RUN: opt < %s -S -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
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; Reduced from test-suite/MultiSource/Benchmarks/MiBench/office-ispell/correct.c
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; getelementptr, obviously, takes pointer as it's base, and returns a pointer.
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; SCEV operands are sorted in hope that it increases folding potential,
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; and at the same time SCEVAddExpr's type is the type of the last(!) operand.
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; Which means, in some exceedingly rare cases, pointer operand may happen to
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; end up not being the last operand, and as a result SCEV for GEP will suddenly
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; have a non-pointer return type. We should ensure that does not happen.
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@c = dso_local local_unnamed_addr global ptr null, align 8
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@a = dso_local local_unnamed_addr global i32 0, align 4
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@b = dso_local global [1 x i32] zeroinitializer, align 4
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define i32 @d(i32 %base) {
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; CHECK-LABEL: 'd'
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; CHECK-NEXT: Classifying expressions for: @d
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; CHECK-NEXT: %e = alloca [1 x [1 x i8]], align 1
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; CHECK-NEXT: --> %e U: full-set S: full-set
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; CHECK-NEXT: %0 = bitcast ptr %e to ptr
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; CHECK-NEXT: --> %e U: full-set S: full-set
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; CHECK-NEXT: %f.0 = phi i32 [ %base, %entry ], [ %inc, %for.cond ]
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; CHECK-NEXT: --> {%base,+,1}<nsw><%for.cond> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
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; CHECK-NEXT: %idxprom = sext i32 %f.0 to i64
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; CHECK-NEXT: --> {(sext i32 %base to i64),+,1}<nsw><%for.cond> U: [-2147483648,-9223372036854775808) S: [-2147483648,-9223372036854775808) Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
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; CHECK-NEXT: %arrayidx = getelementptr inbounds [1 x [1 x i8]], ptr %e, i64 0, i64 %idxprom
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; CHECK-NEXT: --> {((sext i32 %base to i64) + %e),+,1}<nw><%for.cond> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
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; CHECK-NEXT: %1 = load ptr, ptr @c, align 8
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; CHECK-NEXT: --> %1 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %sub.ptr.lhs.cast = ptrtoint ptr %1 to i64
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; CHECK-NEXT: --> (ptrtoint ptr %1 to i64) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, ptrtoint (ptr @b to i64)
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; CHECK-NEXT: --> ((-1 * (ptrtoint ptr @b to i64)) + (ptrtoint ptr %1 to i64)) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %sub.ptr.div = sdiv exact i64 %sub.ptr.sub, 4
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; CHECK-NEXT: --> %sub.ptr.div U: [-2305843009213693952,2305843009213693952) S: [-2305843009213693952,2305843009213693952) Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %arrayidx1 = getelementptr inbounds [1 x i8], ptr %arrayidx, i64 0, i64 %sub.ptr.div
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; CHECK-NEXT: --> ({((sext i32 %base to i64) + %e),+,1}<nw><%for.cond> + %sub.ptr.div) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %2 = load i8, ptr %arrayidx1, align 1
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; CHECK-NEXT: --> %2 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %conv = sext i8 %2 to i32
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; CHECK-NEXT: --> (sext i8 %2 to i32) U: [-128,128) S: [-128,128) Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
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; CHECK-NEXT: %inc = add nsw i32 %f.0, 1
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; CHECK-NEXT: --> {(1 + %base),+,1}<nw><%for.cond> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
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; CHECK-NEXT: Determining loop execution counts for: @d
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; CHECK-NEXT: Loop %for.cond: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: Loop %for.cond: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %for.cond: Unpredictable symbolic max backedge-taken count.
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;
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entry:
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%e = alloca [1 x [1 x i8]], align 1
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%0 = bitcast ptr %e to ptr
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call void @llvm.lifetime.start.p0(i64 1, ptr %0) #2
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br label %for.cond
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for.cond: ; preds = %for.cond, %entry
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%f.0 = phi i32 [ %base, %entry ], [ %inc, %for.cond ]
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%idxprom = sext i32 %f.0 to i64
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%arrayidx = getelementptr inbounds [1 x [1 x i8]], ptr %e, i64 0, i64 %idxprom
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%1 = load ptr, ptr @c, align 8
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%sub.ptr.lhs.cast = ptrtoint ptr %1 to i64
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%sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, ptrtoint (ptr @b to i64)
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%sub.ptr.div = sdiv exact i64 %sub.ptr.sub, 4
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%arrayidx1 = getelementptr inbounds [1 x i8], ptr %arrayidx, i64 0, i64 %sub.ptr.div
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%2 = load i8, ptr %arrayidx1, align 1
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%conv = sext i8 %2 to i32
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store i32 %conv, ptr @a, align 4
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%inc = add nsw i32 %f.0, 1
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br label %for.cond
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}
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declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
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