File: 2008-07-13-DivZero.ll

package info (click to toggle)
llvm-3.0 3.0-10
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 75,412 kB
  • sloc: cpp: 468,043; asm: 109,345; ansic: 13,782; sh: 12,935; ml: 4,716; python: 4,351; perl: 2,096; makefile: 1,905; pascal: 1,578; exp: 389; xml: 283; lisp: 187; csh: 117
file content (16 lines) | stat: -rw-r--r-- 624 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
; RUN: opt < %s -instcombine -S | grep {lshr.*3}
; RUN: opt < %s -instcombine -S | grep {call .*%cond}
; PR2506

; We can simplify the operand of udiv to '8', but not the operand to the
; call.  If the callee never returns, we can't assume the div is reachable.
define i32 @a(i32 %x, i32 %y) {
entry:
        %tobool = icmp ne i32 %y, 0             ; <i1> [#uses=1]
        %cond = select i1 %tobool, i32 8, i32 0         ; <i32> [#uses=2]
        %call = call i32 @b( i32 %cond )                ; <i32> [#uses=0]
        %div = udiv i32 %x, %cond               ; <i32> [#uses=1]
        ret i32 %div
}

declare i32 @b(i32)