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llvm-project/llvm/test/Analysis/ScalarEvolution/pr46786.ll
Nikita Popov f3124a46c1 [SCEV] Fix nsw flags for GEP expressions 
The SCEV code for constructing GEP expressions currently assumes
that the addition of the base and all the offsets is nsw if the GEP
is inbounds. While the addition of the offsets is indeed nsw, the
addition to the base address is not, as the base address is
interpreted as an unsigned value.

Fix the GEP expression code to not assume nsw for the base+offset
calculation. However, do assume nuw if we know that the offset is
non-negative. With this, we use the same behavior as the
construction of GEP addrecs does. (Modulo the fact that we
disregard SCEV unification, as the pre-existing FIXME points out).

Differential Revision: https://reviews.llvm.org/D90648
2020-11-13 18:19:32 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s
; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
source_filename = "input.cpp"
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
; Function Attrs: nofree
define i8* @FSE_decompress_usingDTable(i8* %arg, i32 %arg1, i32 %arg2, i32 %arg3) local_unnamed_addr #0 {
; CHECK-LABEL: 'FSE_decompress_usingDTable'
; CHECK-NEXT: Classifying expressions for: @FSE_decompress_usingDTable
; CHECK-NEXT: %i = getelementptr inbounds i8, i8* %arg, i32 %arg2
; CHECK-NEXT: --> (%arg2 + %arg) U: full-set S: full-set
; CHECK-NEXT: %i4 = sub nsw i32 0, %arg1
; CHECK-NEXT: --> (-1 * %arg1) U: full-set S: full-set
; CHECK-NEXT: %i5 = getelementptr inbounds i8, i8* %i, i32 %i4
; CHECK-NEXT: --> ((-1 * %arg1) + %arg2 + %arg) U: full-set S: full-set
; CHECK-NEXT: %i7 = select i1 %i6, i32 %arg2, i32 %arg1
; CHECK-NEXT: --> ((-1 * %arg) + (((-1 * %arg1) + %arg2 + %arg) umin %arg) + %arg1) U: full-set S: full-set
; CHECK-NEXT: %i8 = sub i32 %arg3, %i7
; CHECK-NEXT: --> ((-1 * (((-1 * %arg1) + %arg2 + %arg) umin %arg)) + (-1 * %arg1) + %arg3 + %arg) U: full-set S: full-set
; CHECK-NEXT: %i9 = getelementptr inbounds i8, i8* %arg, i32 %i8
; CHECK-NEXT: --> ((2 * %arg) + (-1 * (((-1 * %arg1) + %arg2 + %arg) umin %arg)) + (-1 * %arg1) + %arg3) U: full-set S: full-set
; CHECK-NEXT: Determining loop execution counts for: @FSE_decompress_usingDTable
;
bb:
%i = getelementptr inbounds i8, i8* %arg, i32 %arg2
%i4 = sub nsw i32 0, %arg1
%i5 = getelementptr inbounds i8, i8* %i, i32 %i4
%i6 = icmp ult i8* %i5, %arg
%i7 = select i1 %i6, i32 %arg2, i32 %arg1
%i8 = sub i32 %arg3, %i7
%i9 = getelementptr inbounds i8, i8* %arg, i32 %i8
ret i8* %i9
}
define i8* @test_01(i8* %p) {
; CHECK-LABEL: 'test_01'
; CHECK-NEXT: Classifying expressions for: @test_01
; CHECK-NEXT: %p1 = getelementptr i8, i8* %p, i32 2
; CHECK-NEXT: --> (2 + %p) U: full-set S: full-set
; CHECK-NEXT: %p2 = getelementptr i8, i8* %p, i32 1
; CHECK-NEXT: --> (1 + %p) U: full-set S: full-set
; CHECK-NEXT: %index = select i1 %cmp, i32 2, i32 1
; CHECK-NEXT: --> ((-1 * %p) + ((1 + %p) umax (2 + %p))) U: full-set S: full-set
; CHECK-NEXT: %neg_index = sub i32 0, %index
; CHECK-NEXT: --> ((-1 * ((1 + %p) umax (2 + %p))) + %p) U: full-set S: full-set
; CHECK-NEXT: %gep = getelementptr i8, i8* %p, i32 %neg_index
; CHECK-NEXT: --> ((2 * %p) + (-1 * ((1 + %p) umax (2 + %p)))) U: full-set S: full-set
; CHECK-NEXT: Determining loop execution counts for: @test_01
;
%p1 = getelementptr i8, i8* %p, i32 2
%p2 = getelementptr i8, i8* %p, i32 1
%cmp = icmp ugt i8* %p1, %p2
%index = select i1 %cmp, i32 2, i32 1
%neg_index = sub i32 0, %index
%gep = getelementptr i8, i8* %p, i32 %neg_index
ret i8* %gep
}
define i8* @test_02(i8* %p) {
; CHECK-LABEL: 'test_02'
; CHECK-NEXT: Classifying expressions for: @test_02
; CHECK-NEXT: %p1 = getelementptr i8, i8* %p, i32 2
; CHECK-NEXT: --> (2 + %p) U: full-set S: full-set
; CHECK-NEXT: %p2 = getelementptr i8, i8* %p, i32 1
; CHECK-NEXT: --> (1 + %p) U: full-set S: full-set
; CHECK-NEXT: %index = select i1 %cmp, i32 2, i32 1
; CHECK-NEXT: --> ((-1 * %p) + ((1 + %p) smax (2 + %p))) U: full-set S: full-set
; CHECK-NEXT: %neg_index = sub i32 0, %index
; CHECK-NEXT: --> ((-1 * ((1 + %p) smax (2 + %p))) + %p) U: full-set S: full-set
; CHECK-NEXT: %gep = getelementptr i8, i8* %p, i32 %neg_index
; CHECK-NEXT: --> ((2 * %p) + (-1 * ((1 + %p) smax (2 + %p)))) U: full-set S: full-set
; CHECK-NEXT: Determining loop execution counts for: @test_02
;
%p1 = getelementptr i8, i8* %p, i32 2
%p2 = getelementptr i8, i8* %p, i32 1
%cmp = icmp sgt i8* %p1, %p2
%index = select i1 %cmp, i32 2, i32 1
%neg_index = sub i32 0, %index
%gep = getelementptr i8, i8* %p, i32 %neg_index
ret i8* %gep
}
define i8* @test_03(i8* %p) {
; CHECK-LABEL: 'test_03'
; CHECK-NEXT: Classifying expressions for: @test_03
; CHECK-NEXT: %p1 = getelementptr i8, i8* %p, i32 2
; CHECK-NEXT: --> (2 + %p) U: full-set S: full-set
; CHECK-NEXT: %p2 = getelementptr i8, i8* %p, i32 1
; CHECK-NEXT: --> (1 + %p) U: full-set S: full-set
; CHECK-NEXT: %index = select i1 %cmp, i32 2, i32 1
; CHECK-NEXT: --> ((-1 * %p) + ((1 + %p) umin (2 + %p))) U: full-set S: full-set
; CHECK-NEXT: %neg_index = sub i32 0, %index
; CHECK-NEXT: --> ((-1 * ((1 + %p) umin (2 + %p))) + %p) U: full-set S: full-set
; CHECK-NEXT: %gep = getelementptr i8, i8* %p, i32 %neg_index
; CHECK-NEXT: --> ((2 * %p) + (-1 * ((1 + %p) umin (2 + %p)))) U: full-set S: full-set
; CHECK-NEXT: Determining loop execution counts for: @test_03
;
%p1 = getelementptr i8, i8* %p, i32 2
%p2 = getelementptr i8, i8* %p, i32 1
%cmp = icmp ult i8* %p1, %p2
%index = select i1 %cmp, i32 2, i32 1
%neg_index = sub i32 0, %index
%gep = getelementptr i8, i8* %p, i32 %neg_index
ret i8* %gep
}
define i8* @test_04(i8* %p) {
; CHECK-LABEL: 'test_04'
; CHECK-NEXT: Classifying expressions for: @test_04
; CHECK-NEXT: %p1 = getelementptr i8, i8* %p, i32 2
; CHECK-NEXT: --> (2 + %p) U: full-set S: full-set
; CHECK-NEXT: %p2 = getelementptr i8, i8* %p, i32 1
; CHECK-NEXT: --> (1 + %p) U: full-set S: full-set
; CHECK-NEXT: %index = select i1 %cmp, i32 2, i32 1
; CHECK-NEXT: --> ((-1 * %p) + ((1 + %p) smin (2 + %p))) U: full-set S: full-set
; CHECK-NEXT: %neg_index = sub i32 0, %index
; CHECK-NEXT: --> ((-1 * ((1 + %p) smin (2 + %p))) + %p) U: full-set S: full-set
; CHECK-NEXT: %gep = getelementptr i8, i8* %p, i32 %neg_index
; CHECK-NEXT: --> ((2 * %p) + (-1 * ((1 + %p) smin (2 + %p)))) U: full-set S: full-set
; CHECK-NEXT: Determining loop execution counts for: @test_04
;
%p1 = getelementptr i8, i8* %p, i32 2
%p2 = getelementptr i8, i8* %p, i32 1
%cmp = icmp slt i8* %p1, %p2
%index = select i1 %cmp, i32 2, i32 1
%neg_index = sub i32 0, %index
%gep = getelementptr i8, i8* %p, i32 %neg_index
ret i8* %gep
}
attributes #0 = { nofree }
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