File: invariant_load.ll

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.4-1~deb12u1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,998,488 kB
  • sloc: cpp: 6,951,470; ansic: 1,486,052; asm: 913,550; python: 232,020; f90: 80,126; objc: 75,349; lisp: 37,276; pascal: 16,990; sh: 9,935; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,164; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (26 lines) | stat: -rw-r--r-- 695 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
 
; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn -S | FileCheck %s

; The input *.ll is obtained by manually annotating "invariant.load" to the 
; two loads. With "invariant.load" metadata, the second load is redundant.
;
; int foo(int *p, char *q) {
;     *q = (char)*p;
;     return *p + 1;
; }

define i32 @foo(ptr nocapture %p, ptr nocapture %q) {
entry:
  %0 = load i32, ptr %p, align 4, !invariant.load !3
  %conv = trunc i32 %0 to i8
  store i8 %conv, ptr %q, align 1
  %1 = load i32, ptr %p, align 4, !invariant.load !3
  %add = add nsw i32 %1, 1
  ret i32 %add

; CHECK: foo
; CHECK: %0 = load i32, ptr %p
; CHECK: store i8 %conv, ptr %q,
; CHECK: %add = add nsw i32 %0, 1
}

!3 = !{}