File: prefetch-load.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 (31 lines) | stat: -rw-r--r-- 1,042 bytes parent folder | download | duplicates (12) 
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
 
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

%struct.C = type { ptr, i32 }

; Check that we instcombine the load across the prefetch.

; CHECK-LABEL: define signext i32 @foo
define signext i32 @foo(ptr %c) local_unnamed_addr #0 {
; CHECK: store i32 %dec, ptr %length_
; CHECK-NOT: load
; CHECK: llvm.prefetch
; CHECK-NEXT: ret
entry:
  %0 = load ptr, ptr %c, align 8
  %1 = load ptr, ptr %0, align 8
  store ptr %1, ptr %c, align 8
  %length_ = getelementptr inbounds %struct.C, ptr %c, i32 0, i32 1
  %2 = load i32, ptr %length_, align 8
  %dec = add nsw i32 %2, -1
  store i32 %dec, ptr %length_, align 8
  call void @llvm.prefetch(ptr %1, i32 0, i32 0, i32 1)
  %3 = load i32, ptr %length_, align 8
  ret i32 %3
}

; Function Attrs: inaccessiblemem_or_argmemonly nounwind
declare void @llvm.prefetch(ptr nocapture readonly, i32, i32, i32) 

attributes #0 = { noinline nounwind }
; We've explicitly removed the function attrs from llvm.prefetch so we get the defaults.
; attributes #1 = { inaccessiblemem_or_argmemonly nounwind }