/
add-expr-pointer-operand-sorting.ll
75 lines (69 loc) · 4.78 KB
/
add-expr-pointer-operand-sorting.ll
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt < %s -S -analyze -scalar-evolution | FileCheck %s
; Reduced from test-suite/MultiSource/Benchmarks/MiBench/office-ispell/correct.c
; getelementptr, obviously, takes pointer as it's base, and returns a pointer.
; SCEV operands are sorted in hope that it increases folding potential,
; and at the same time SCEVAddExpr's type is the type of the last(!) operand.
; Which means, in some exceedingly rare cases, pointer operand may happen to
; end up not being the last operand, and as a result SCEV for GEP will suddenly
; have a non-pointer return type. We should ensure that does not happen.
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@c = dso_local local_unnamed_addr global i32* null, align 8
@a = dso_local local_unnamed_addr global i32 0, align 4
@b = dso_local global [1 x i32] zeroinitializer, align 4
define i32 @d(i32 %base) {
; CHECK-LABEL: 'd'
; CHECK-NEXT: Classifying expressions for: @d
; CHECK-NEXT: %e = alloca [1 x [1 x i8]], align 1
; CHECK-NEXT: --> %e U: full-set S: full-set
; CHECK-NEXT: %0 = bitcast [1 x [1 x i8]]* %e to i8*
; CHECK-NEXT: --> %e U: full-set S: full-set
; CHECK-NEXT: %f.0 = phi i32 [ %base, %entry ], [ %inc, %for.cond ]
; CHECK-NEXT: --> {%base,+,1}<nsw><%for.cond> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
; CHECK-NEXT: %idxprom = sext i32 %f.0 to i64
; CHECK-NEXT: --> {(sext i32 %base to i64),+,1}<nsw><%for.cond> U: [-2147483648,-9223372036854775808) S: [-2147483648,-9223372036854775808) Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
; CHECK-NEXT: %arrayidx = getelementptr inbounds [1 x [1 x i8]], [1 x [1 x i8]]* %e, i64 0, i64 %idxprom
; CHECK-NEXT: --> {((sext i32 %base to i64) + %e)<nsw>,+,1}<nsw><%for.cond> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
; CHECK-NEXT: %1 = load i32*, i32** @c, align 8
; CHECK-NEXT: --> %1 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %sub.ptr.lhs.cast = ptrtoint i32* %1 to i64
; CHECK-NEXT: --> %sub.ptr.lhs.cast U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, ptrtoint ([1 x i32]* @b to i64)
; CHECK-NEXT: --> ((-1 * ptrtoint ([1 x i32]* @b to i64)) + %sub.ptr.lhs.cast) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %sub.ptr.div = sdiv exact i64 %sub.ptr.sub, 4
; CHECK-NEXT: --> %sub.ptr.div U: full-set S: [-2305843009213693952,2305843009213693952) Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %arrayidx1 = getelementptr inbounds [1 x i8], [1 x i8]* %arrayidx, i64 0, i64 %sub.ptr.div
; CHECK-NEXT: --> ({((sext i32 %base to i64) + %e)<nsw>,+,1}<nsw><%for.cond> + %sub.ptr.div)<nsw> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %2 = load i8, i8* %arrayidx1, align 1
; CHECK-NEXT: --> %2 U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %conv = sext i8 %2 to i32
; CHECK-NEXT: --> (sext i8 %2 to i32) U: [-128,128) S: [-128,128) Exits: <<Unknown>> LoopDispositions: { %for.cond: Variant }
; CHECK-NEXT: %inc = add nsw i32 %f.0, 1
; CHECK-NEXT: --> {(1 + %base),+,1}<nw><%for.cond> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.cond: Computable }
; CHECK-NEXT: Determining loop execution counts for: @d
; CHECK-NEXT: Loop %for.cond: <multiple exits> Unpredictable backedge-taken count.
; CHECK-NEXT: Loop %for.cond: Unpredictable max backedge-taken count.
; CHECK-NEXT: Loop %for.cond: Unpredictable predicated backedge-taken count.
;
entry:
%e = alloca [1 x [1 x i8]], align 1
%0 = bitcast [1 x [1 x i8]]* %e to i8*
call void @llvm.lifetime.start.p0i8(i64 1, i8* %0) #2
br label %for.cond
for.cond: ; preds = %for.cond, %entry
%f.0 = phi i32 [ %base, %entry ], [ %inc, %for.cond ]
%idxprom = sext i32 %f.0 to i64
%arrayidx = getelementptr inbounds [1 x [1 x i8]], [1 x [1 x i8]]* %e, i64 0, i64 %idxprom
%1 = load i32*, i32** @c, align 8
%sub.ptr.lhs.cast = ptrtoint i32* %1 to i64
%sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, ptrtoint ([1 x i32]* @b to i64)
%sub.ptr.div = sdiv exact i64 %sub.ptr.sub, 4
%arrayidx1 = getelementptr inbounds [1 x i8], [1 x i8]* %arrayidx, i64 0, i64 %sub.ptr.div
%2 = load i8, i8* %arrayidx1, align 1
%conv = sext i8 %2 to i32
store i32 %conv, i32* @a, align 4
%inc = add nsw i32 %f.0, 1
br label %for.cond
}
declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)