File: scev-expander-incorrect-nowrap.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 (30 lines) | stat: -rw-r--r-- 722 bytes parent folder | download | duplicates (22) 
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
 
; RUN: opt -indvars -S < %s | FileCheck %s

declare void @use(i32)
declare void @use.i8(i8)

define void @f() {
; CHECK-LABEL: @f
 entry:
  br label %loop

 loop:
; The only use for idx.mirror is to induce an nuw for %idx.  It does
; not induce an nuw for %idx.inc
  %idx.mirror = phi i8 [ -6, %entry ], [ %idx.mirror.inc, %loop ]
  %idx = phi i8 [ -5, %entry ], [ %idx.inc, %loop ]

  %idx.sext = sext i8 %idx to i32
  call void @use(i32 %idx.sext)

  %idx.mirror.inc = add nuw i8 %idx.mirror, 1
  call void @use.i8(i8 %idx.mirror.inc)

  %idx.inc = add i8 %idx, 1
; CHECK-NOT: %indvars.iv.next = add nuw nsw i32 %indvars.iv, 1
  %cmp = icmp ugt i8 %idx.inc, 0
  br i1 %cmp, label %loop, label %exit

 exit:
  ret void
}