File: peel-loop-irreducible.ll

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-12
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,496,180 kB
  • sloc: cpp: 5,593,972; ansic: 986,872; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,538; xml: 953; cs: 573; fortran: 567
file content (36 lines) | stat: -rw-r--r-- 951 bytes parent folder | download | duplicates (15) 
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
28
29
30
31
32
33
34
35
36
 
; RUN: opt < %s -S -loop-unroll -unroll-force-peel-count=1 | FileCheck %s

; Check we don't peel loops where the latch is not the exiting block.
; CHECK-LABEL: @invariant_backedge_irreducible
; CHECK: entry:
; CHECK: br label %header
; CHECK-NOT: peel
; CHECK: header:
; CHECK: br i1 {{.*}} label %latch, label %exiting
; CHECK: latch:
; CHECK: br i1 {{.*}} label %header, label %exiting
; CHECK: exiting:
; CHECK: br i1 {{.*}} label %latch, label %exit

define i32 @invariant_backedge_irreducible(i32 %a, i32 %b) {
entry:
  br label %header

header:
  %i = phi i32 [ 0, %entry ], [ %inc, %latch ]
  %cmp.phi = phi i1 [ false, %entry ], [ %cmp, %latch ]
  br i1 %cmp.phi, label %latch, label %exiting

latch:
  %inc = add i32 %i, 1
  %cmp = icmp slt i32 %i, 1000
  br i1 %cmp, label %header, label %exiting

exiting:
  %cmp.exiting = phi i1 [ %cmp.phi, %header ], [ %cmp, %latch ]
  br i1 %cmp.exiting, label %latch, label %exit

exit:
  ret i32 0
}