File: 2002-03-11-ConstPropCrash.ll

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-6~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,418,812 kB
  • sloc: cpp: 5,290,827; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,900; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,892; xml: 953; cs: 573; fortran: 539
file content (24 lines) | stat: -rw-r--r-- 876 bytes parent folder | download | duplicates (6) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
; When constant propogating terminator instructions, the basic block iterator
; was not updated to refer to the final position of the new terminator.  This
; can be bad, f.e. because constproping a terminator can lead to the 
; destruction of PHI nodes, which invalidates the iterator!
;
; Fixed by adding new arguments to ConstantFoldTerminator
;
; RUN: opt < %s -instsimplify

define void @build_tree(i32 %ml) {
; <label>:0
        br label %bb2

bb2:            ; preds = %bb2, %0
        %reg137 = phi i32 [ %reg140, %bb2 ], [ 12, %0 ]         ; <i32> [#uses=1]
        %reg138 = phi i32 [ %reg139, %bb2 ], [ 0, %0 ]          ; <i32> [#uses=1]
        %reg139 = add i32 %reg138, 1            ; <i32> [#uses=1]
        %reg140 = add i32 %reg137, -1           ; <i32> [#uses=1]
        br i1 false, label %bb2, label %bb3

bb3:            ; preds = %bb2
        ret void
}