File: gv-offset-folding.ll

package info (click to toggle)
llvm-toolchain-21 1%3A21.1.6-2
  • links: PTS, VCS
  • area: main
  • in suites: forky
  • size: 2,245,044 kB
  • sloc: cpp: 7,619,726; ansic: 1,434,018; asm: 1,058,748; python: 252,740; f90: 94,671; objc: 70,685; lisp: 42,813; pascal: 18,401; sh: 8,601; ml: 5,111; perl: 4,720; makefile: 3,666; awk: 3,523; javascript: 2,409; xml: 892; fortran: 770
file content (21 lines) | stat: -rw-r--r-- 858 bytes parent folder | download | duplicates (17)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=fiji -mattr=-flat-for-global -relocation-model=static < %s | FileCheck %s

@lds = external addrspace(3) global [4 x i32]

; Function Attrs: nounwind

; Offset folding is an optimization done for global variables with relocations,
; which allows you to store the offset in the r_addend of the relocation entry.
; The offset is apllied to the variables address at link time, which eliminates
; the need to emit shader instructions to do this calculation.
; We don't use relocations for local memory, so we should never fold offsets
; for local memory globals.

; CHECK-LABEL: lds_no_offset:
; CHECK: ds_write_b32 v{{[0-9]+}}, v{{[0-9]+}} offset:4
define amdgpu_kernel void @lds_no_offset() {
entry:
  %ptr = getelementptr [4 x i32], ptr addrspace(3) @lds, i32 0, i32 1
  store i32 0, ptr addrspace(3) %ptr
  ret void
}