File: badFoldGEP.ll

package info (click to toggle)
llvm 2.6-9.1
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 57,604 kB
  • ctags: 44,336
  • sloc: cpp: 344,766; sh: 12,407; ansic: 10,617; ada: 3,070; ml: 2,505; perl: 2,496; makefile: 1,426; pascal: 1,163; exp: 389; asm: 307; python: 298; objc: 260; lisp: 182; csh: 117; xml: 38; f90: 36; tcl: 20
file content (27 lines) | stat: -rw-r--r-- 1,273 bytes parent folder | download
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
; RUN: llvm-as < %s | llc

;; GetMemInstArgs() folded the two getElementPtr instructions together,
;; producing an illegal getElementPtr.  That's because the type generated
;; by the last index for the first one is a structure field, not an array
;; element, and the second one indexes off that structure field.
;; The code is legal but not type-safe and the two GEPs should not be folded.
;; 
;; This code fragment is from Spec/CINT2000/197.parser/197.parser.bc,
;; file post_process.c, function build_domain().
;; (Modified to replace store with load and return load value.)
;; 
        %Domain = type { i8*, i32, i32*, i32, i32, i32*, %Domain* }
@domain_array = external global [497 x %Domain]         ; <[497 x %Domain]*> [#uses=2]

declare void @opaque([497 x %Domain]*)

define i32 @main(i32 %argc, i8** %argv) {
bb0:
        call void @opaque( [497 x %Domain]* @domain_array )
        %cann-indvar-idxcast = sext i32 %argc to i64            ; <i64> [#uses=1]
        %reg841 = getelementptr [497 x %Domain]* @domain_array, i64 0, i64 %cann-indvar-idxcast, i32 3          ; <i32*> [#uses=1]
        %reg846 = getelementptr i32* %reg841, i64 1             ; <i32*> [#uses=1]
        %reg820 = load i32* %reg846             ; <i32> [#uses=1]
        ret i32 %reg820
}