File: fneg-combines.si.ll

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (28 lines) | stat: -rw-r--r-- 1,464 bytes parent folder | download
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
; RUN: llc -march=amdgcn -mcpu=tahiti -start-before=amdgpu-unify-divergent-exit-nodes -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=GCN %s
; RUN: llc -enable-no-signed-zeros-fp-math -march=amdgcn -mcpu=tahiti -start-before=amdgpu-unify-divergent-exit-nodes -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=GCN %s

; --------------------------------------------------------------------------------
; rcp_legacy tests
; --------------------------------------------------------------------------------

; GCN-LABEL: {{^}}v_fneg_rcp_legacy_f32:
; GCN: {{buffer|flat}}_load_dword [[A:v[0-9]+]]
; GCN: v_rcp_legacy_f32_e64 [[RESULT:v[0-9]+]], -[[A]]
; GCN: {{buffer|flat}}_store_dword [[RESULT]]
define amdgpu_kernel void @v_fneg_rcp_legacy_f32(float addrspace(1)* %out, float addrspace(1)* %a.ptr) #0 {
  %tid = call i32 @llvm.amdgcn.workitem.id.x()
  %tid.ext = sext i32 %tid to i64
  %a.gep = getelementptr inbounds float, float addrspace(1)* %a.ptr, i64 %tid.ext
  %out.gep = getelementptr inbounds float, float addrspace(1)* %out, i64 %tid.ext
  %a = load volatile float, float addrspace(1)* %a.gep
  %rcp = call float @llvm.amdgcn.rcp.legacy(float %a)
  %fneg = fsub float -0.000000e+00, %rcp
  store float %fneg, float addrspace(1)* %out.gep
  ret void
}

declare i32 @llvm.amdgcn.workitem.id.x() #1
declare float @llvm.amdgcn.rcp.legacy(float) #1

attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }