File: dup_tail.ll

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (26 lines) | stat: -rw-r--r-- 818 bytes parent folder | download | duplicates (16) 
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
 
; REQUIRES: asserts
; Duplicate the return into if.end to enable TCE.
; RUN: opt -passes=tailcallelim -verify-dom-info -stats -disable-output < %s 2>&1 | FileCheck %s

; CHECK: Number of return duplicated

define i32 @fib(i32 %n) nounwind ssp {
entry:
  %cmp = icmp slt i32 %n, 2
  br i1 %cmp, label %if.then, label %if.end

if.then:                                          ; preds = %entry
  br label %return

if.end:                                           ; preds = %entry
  %sub = add nsw i32 %n, -2
  %call = call i32 @fib(i32 %sub)
  %sub3 = add nsw i32 %n, -1
  %call4 = call i32 @fib(i32 %sub3)
  %add = add nsw i32 %call, %call4
  br label %return

return:                                           ; preds = %if.end, %if.then
  %retval.0 = phi i32 [ 1, %if.then ], [ %add, %if.end ]
  ret i32 %retval.0
}