File: unswitch-select.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (27 lines) | stat: -rw-r--r-- 1,045 bytes parent folder | download | duplicates (4) 
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
 
; REQUIRES: asserts
; RUN: opt < %s -loop-unswitch -disable-output -stats 2>&1| FileCheck %s
; RUN: opt < %s -loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa -disable-output -stats 2>&1| FileCheck %s

; Check the select statement in the loop will be unswitched.
; CHECK: 1 loop-unswitch - Number of selects unswitched
define i32 @test(i1 zeroext %x, i32 %a) local_unnamed_addr #0 {
entry:
  br label %while.cond

while.cond:                                       ; preds = %while.body, %entry
  %i.0 = phi i32 [ 0, %entry ], [ %inc, %while.body ]
  %s.0 = phi i32 [ %a, %entry ], [ %add, %while.body ]
  %cmp = icmp slt i32 %i.0, 10000
  br i1 %cmp, label %while.body, label %while.end

while.body:                                       ; preds = %while.cond
  %cond = select i1 %x, i32 %a, i32 %i.0
  %add = add nsw i32 %s.0, %cond
  %inc = add nsw i32 %i.0, 1
  br label %while.cond

while.end:                                        ; preds = %while.cond
  %s.0.lcssa = phi i32 [ %s.0, %while.cond ]
  ret i32 %s.0.lcssa
}