File: incorrect-nsw.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (26 lines) | stat: -rw-r--r-- 689 bytes parent folder | download | duplicates (15) 
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
 
; RUN: opt -analyze -scalar-evolution -scalar-evolution < %s | FileCheck %s

define void @bad.nsw() {
; CHECK-LABEL: Classifying expressions for: @bad.nsw
; CHECK-LABEL: Classifying expressions for: @bad.nsw
 entry: 
  br label %loop

 loop:
  %i = phi i8 [ -1, %entry ], [ %i.inc, %loop ]
; CHECK:  %i = phi i8 [ -1, %entry ], [ %i.inc, %loop ]
; CHECK-NEXT: -->  {-1,+,-128}<nw><%loop>
; CHECK-NOT: -->  {-1,+,-128}<nsw><%loop>

  %counter = phi i8 [ 0, %entry ], [ %counter.inc, %loop ]

  %i.inc = add i8 %i, -128
  %i.sext = sext i8 %i to i16

  %counter.inc = add i8 %counter, 1
  %continue = icmp eq i8 %counter, 1
  br i1 %continue, label %exit, label %loop

 exit:
  ret void  
}