File: 2008-06-23-DeadAfterLive.ll

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (23 lines) | stat: -rw-r--r-- 653 bytes parent folder | download | duplicates (18) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
; RUN: opt < %s -passes='deadargelim,function(dce)' -S > %t
; RUN: cat %t | grep 123

; This test tries to catch wrongful removal of return values for a specific case
; that was breaking llvm-gcc builds.

; This function has a live return value, it is used by @alive.
define internal i32 @test5() {
  ret i32 123 
}

; This function doesn't use the return value @test5 and tries to lure DAE into
; marking @test5's return value dead because only this call is unused.
define i32 @dead() {
  %DEAD = call i32 @test5()
  ret i32 0
}

; This function ensures the retval of @test5 is live.
define i32 @alive() {
  %LIVE = call i32 @test5()
  ret i32 %LIVE
}