File: tail-call-unused-zext.ll

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,998,520 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (36 lines) | stat: -rw-r--r-- 1,029 bytes parent folder | download | duplicates (20) 
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: llc -mtriple=arm64--- -stop-after=finalize-isel -o - %s | FileCheck %s

; Check that we ignore the zeroext attribute on the return type of the tail
; call, since the return value is unused. This happens during CodeGenPrepare in
; dupRetToEnableTailCallOpts, which calls attributesPermitTailCall to check if
; the attributes of the caller and the callee match.

declare zeroext i1 @zcallee()
define void @zcaller() {
; CHECK-LABEL: name: zcaller
entry:
  br i1 undef, label %calllabel, label %retlabel
calllabel:
; CHECK: bb.1.calllabel:
; CHECK-NOT: BL @zcallee
; CHECK-NEXT: TCRETURNdi @zcallee
  %unused_result = tail call zeroext i1 @zcallee()
  br label %retlabel
retlabel:
  ret void
}

declare signext i1 @scallee()
define void @scaller() {
; CHECK-LABEL: name: scaller
entry:
  br i1 undef, label %calllabel, label %retlabel
calllabel:
; CHECK: bb.1.calllabel:
; CHECK-NOT: BL @scallee
; CHECK-NEXT: TCRETURNdi @scallee
  %unused_result = tail call signext i1 @scallee()
  br label %retlabel
retlabel:
  ret void
}