view test/CodeGen/AArch64/misched-fusion.ll @ 100:7d135dc70f03 LLVM 3.9

LLVM 3.9
author Miyagi Mitsuki <e135756@ie.u-ryukyu.ac.jp>
date Tue, 26 Jan 2016 22:53:40 +0900
parents afa8332a0e37
children 1172e4bd9c6f
line wrap: on
line source

; RUN: llc -o - %s -mcpu=cyclone | FileCheck %s
target triple = "arm64-apple-ios"

declare void @foobar(i32 %v0, i32 %v1)

; Make sure sub is scheduled in front of cbnz
; CHECK-LABEL: test_sub_cbz:
; CHECK: add w[[ADDRES:[0-9]+]], w1, #7
; CHECK: sub w[[SUBRES:[0-9]+]], w0, #13
; CHECK-NEXT: cbnz w[[SUBRES]], [[SKIPBLOCK:LBB[0-9_]+]]
; CHECK: mov x0, x[[ADDRES]]
; CHECK: mov x1, x[[SUBRES]]
; CHECK: bl _foobar
; CHECK: [[SKIPBLOCK]]:
; CHECK: mov x0, x[[SUBRES]]
; CHECK: mov x1, x[[ADDRES]]
; CHECK: bl _foobar
define void @test_sub_cbz(i32 %a0, i32 %a1) {
entry:
  ; except for the fusion opportunity the sub/add should be equal so the
  ; scheduler would leave them in source order if it weren't for the scheduling
  %v0 = sub i32 %a0, 13
  %cond = icmp eq i32 %v0, 0
  %v1 = add i32 %a1, 7
  br i1 %cond, label %if, label %exit

if:
  call void @foobar(i32 %v1, i32 %v0)
  br label %exit

exit:
  call void @foobar(i32 %v0, i32 %v1)
  ret void
}