File: int_sideeffect.ll

package info (click to toggle)
llvm-toolchain-9 1%3A9.0.1-16.1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 882,388 kB
  • sloc: cpp: 4,167,636; ansic: 714,256; asm: 457,610; python: 155,927; objc: 65,094; sh: 42,856; lisp: 26,908; perl: 7,786; pascal: 7,722; makefile: 6,881; ml: 5,581; awk: 3,648; cs: 2,027; xml: 888; javascript: 381; ruby: 156
file content (27 lines) | stat: -rw-r--r-- 597 bytes parent folder | download | duplicates (8) 
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
 
; RUN: opt -S < %s -early-cse | FileCheck %s

declare void @llvm.sideeffect()

; Store-to-load forwarding across a @llvm.sideeffect.

; CHECK-LABEL: s2l
; CHECK-NOT: load
define float @s2l(float* %p) {
    store float 0.0, float* %p
    call void @llvm.sideeffect()
    %t = load float, float* %p
    ret float %t
}

; Redundant load elimination across a @llvm.sideeffect.

; CHECK-LABEL: rle
; CHECK: load
; CHECK-NOT: load
define float @rle(float* %p) {
    %r = load float, float* %p
    call void @llvm.sideeffect()
    %s = load float, float* %p
    %t = fadd float %r, %s
    ret float %t
}