llvm/test/CodeGen/AMDGPU/loop-header-align-gfx950.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
; RUN: llc -mtriple=amdgpu9.50 < %s | FileCheck %s

; Block placement rotates these loops so that %body, not the LoopInfo header,
; is the backedge destination that gets aligned. The GFX950 fetch-window
; alignment decision must be based on the first instruction of %body.

; %body starts with an 8-byte v_mul_f64 while %header starts with a 4-byte
; s_cmp, so %body must be aligned.
define amdgpu_kernel void @rotated_loop_8byte_top_block(ptr addrspace(1) %out, i32 %n, double %x) {
; CHECK-LABEL: rotated_loop_8byte_top_block:
; CHECK:       ; %bb.0: ; %entry
; CHECK-NEXT:    s_load_dwordx2 s[2:3], s[4:5], 0x34
; CHECK-NEXT:    s_load_dword s0, s[4:5], 0x2c
; CHECK-NEXT:    s_mov_b32 s1, 0
; CHECK-NEXT:    s_waitcnt lgkmcnt(0)
; CHECK-NEXT:    v_mov_b64_e32 v[0:1], s[2:3]
; CHECK-NEXT:    s_cmp_ge_i32 s1, s0
; CHECK-NEXT:    s_cbranch_scc1 .LBB0_2
; CHECK-NEXT:    .p2align 5, , 4
; CHECK-NEXT:  .LBB0_1: ; %body
; CHECK-NEXT:    ; =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    v_mul_f64 v[0:1], v[0:1], v[0:1]
; CHECK-NEXT:    s_add_i32 s1, s1, 1
; CHECK-NEXT:    s_cmp_ge_i32 s1, s0
; CHECK-NEXT:    s_cbranch_scc0 .LBB0_1
; CHECK-NEXT:  .LBB0_2: ; %exit
; CHECK-NEXT:    s_load_dwordx2 s[0:1], s[4:5], 0x24
; CHECK-NEXT:    v_mov_b32_e32 v2, 0
; CHECK-NEXT:    s_waitcnt lgkmcnt(0)
; CHECK-NEXT:    global_store_dwordx2 v2, v[0:1], s[0:1]
; CHECK-NEXT:    s_endpgm
entry:
  br label %header

header:
  %i = phi i32 [ 0, %entry ], [ %i.next, %body ]
  %acc = phi double [ %x, %entry ], [ %acc.next, %body ]
  %cmp = icmp slt i32 %i, %n
  br i1 %cmp, label %body, label %exit

body:
  %acc.next = fmul double %acc, %acc
  %i.next = add i32 %i, 1
  br label %header

exit:
  store double %acc, ptr addrspace(1) %out
  ret void
}

; %body starts with a 4-byte s_add while %header starts with an 8-byte s_cmp
; with a literal operand, so %body must not be aligned.
define amdgpu_kernel void @rotated_loop_4byte_top_block(ptr addrspace(1) %out, i32 %n, double %x) {
; CHECK-LABEL: rotated_loop_4byte_top_block:
; CHECK:       ; %bb.0: ; %entry
; CHECK-NEXT:    s_load_dwordx2 s[2:3], s[4:5], 0x34
; CHECK-NEXT:    s_load_dword s0, s[4:5], 0x2c
; CHECK-NEXT:    s_mov_b32 s1, 0
; CHECK-NEXT:    s_waitcnt lgkmcnt(0)
; CHECK-NEXT:    v_mov_b64_e32 v[0:1], s[2:3]
; CHECK-NEXT:    .p2align 5, , 4
; CHECK-NEXT:  .LBB1_1: ; %header
; CHECK-NEXT:    ; =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    s_cmp_gt_i32 s1, 0xf423f
; CHECK-NEXT:    v_mul_f64 v[0:1], v[0:1], v[0:1]
; CHECK-NEXT:    s_cbranch_scc1 .LBB1_3
; CHECK-NEXT:  ; %bb.2: ; %body
; CHECK-NEXT:    ; in Loop: Header=BB1_1 Depth=1
; CHECK-NEXT:    s_add_i32 s1, s1, s0
; CHECK-NEXT:    v_add_f64 v[0:1], v[0:1], 1.0
; CHECK-NEXT:    s_branch .LBB1_1
; CHECK-NEXT:  .LBB1_3: ; %exit
; CHECK-NEXT:    s_load_dwordx2 s[0:1], s[4:5], 0x24
; CHECK-NEXT:    v_mov_b32_e32 v2, 0
; CHECK-NEXT:    s_waitcnt lgkmcnt(0)
; CHECK-NEXT:    global_store_dwordx2 v2, v[0:1], s[0:1]
; CHECK-NEXT:    s_endpgm
entry:
  br label %header

header:
  %i = phi i32 [ 0, %entry ], [ %i.next, %body ]
  %acc = phi double [ %x, %entry ], [ %acc.next, %body ]
  %acc.sq = fmul double %acc, %acc
  %cmp = icmp slt i32 %i, 1000000
  br i1 %cmp, label %body, label %exit

body:
  %i.next = add i32 %i, %n
  %acc.next = fadd double %acc.sq, 1.0
  br label %header

exit:
  store double %acc.sq, ptr addrspace(1) %out
  ret void
}