File: divergence-driven-bfe-isel.ll

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (25 lines) | stat: -rw-r--r-- 758 bytes parent folder | download | duplicates (4) 
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
 
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s

; GCN-LABEL: @bfe_uniform
; GCN: s_bfe_u32 s{{[0-9]+}}, s{{[0-9]+}}, 0x40010
define amdgpu_kernel void @bfe_uniform(i32 %val, ptr addrspace(1) %out) {
  %hibits = lshr i32 %val, 16
  %masked = and i32 %hibits, 15
  store i32 %masked, ptr addrspace(1) %out
  ret void
}

; GCN-LABEL: @bfe_divergent
; GCN: v_bfe_u32 v{{[0-9]+}}, v{{[0-9]+}}, 16, 4
define amdgpu_kernel void @bfe_divergent(i32 %val, ptr addrspace(1) %out) {
  %tid = call i32 @llvm.amdgcn.workitem.id.x()
  %divergent = add i32 %val, %tid
  %hibits = lshr i32 %divergent, 16
  %masked = and i32 %hibits, 15
  store i32 %masked, ptr addrspace(1) %out
  ret void
}


declare i32 @llvm.amdgcn.workitem.id.x()