test/CodeGen/AArch64/cheap-as-a-move.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
; RUN: llc < %s | FileCheck %s

target triple = "aarch64-unknown-linux"

; Check an "expensive" construction of a constant is hoisted out of a loop
define void @f0(ptr %a, i64 %n) {
; CHECK-LABEL: f0:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    str x30, [sp, #-48]! // 8-byte Folded Spill
; CHECK-NEXT:    stp x22, x21, [sp, #16] // 16-byte Folded Spill
; CHECK-NEXT:    stp x20, x19, [sp, #32] // 16-byte Folded Spill
; CHECK-NEXT:    .cfi_def_cfa_offset 48
; CHECK-NEXT:    .cfi_offset w19, -8
; CHECK-NEXT:    .cfi_offset w20, -16
; CHECK-NEXT:    .cfi_offset w21, -24
; CHECK-NEXT:    .cfi_offset w22, -32
; CHECK-NEXT:    .cfi_offset w30, -48
; CHECK-NEXT:    mov x21, #1 // =0x1
; CHECK-NEXT:    mov x19, x1
; CHECK-NEXT:    mov x20, x0
; CHECK-NEXT:    movk x21, #22136, lsl #16
; CHECK-NEXT:    mov x22, xzr
; CHECK-NEXT:    movk x21, #4660, lsl #48
; CHECK-NEXT:    cmp x22, x19
; CHECK-NEXT:    b.ge .LBB0_2
; CHECK-NEXT:  .LBB0_1: // %loop.body
; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    ldr w0, [x20, x22, lsl #2]
; CHECK-NEXT:    mov x1, x21
; CHECK-NEXT:    bl g
; CHECK-NEXT:    str w0, [x20, x22, lsl #2]
; CHECK-NEXT:    add x22, x22, #1
; CHECK-NEXT:    cmp x22, x19
; CHECK-NEXT:    b.lt .LBB0_1
; CHECK-NEXT:  .LBB0_2: // %exit
; CHECK-NEXT:    ldp x20, x19, [sp, #32] // 16-byte Folded Reload
; CHECK-NEXT:    ldp x22, x21, [sp, #16] // 16-byte Folded Reload
; CHECK-NEXT:    ldr x30, [sp], #48 // 8-byte Folded Reload
; CHECK-NEXT:    ret
entry:
  br label %loop

loop:
  %i = phi i64 [0, %entry], [%i.next, %loop.body]
  %c = icmp slt i64 %i, %n
  br i1 %c, label %loop.body, label %exit

loop.body:
  %p = getelementptr i32, ptr %a, i64 %i
  %v = load i32, ptr %p
  %w = call i32 @g(i32 %v, i64 1311673392922361857) ; 0x1234000056780001
  store i32 %w, ptr %p
  %i.next = add i64 %i, 1
  br label %loop

exit:
  ret void
}

; Check a "cheap" to construct constant is materialised inside a loop.
define void @f1(ptr %a, i64 %n) {
; CHECK-LABEL: f1:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    stp x30, x21, [sp, #-32]! // 16-byte Folded Spill
; CHECK-NEXT:    stp x20, x19, [sp, #16] // 16-byte Folded Spill
; CHECK-NEXT:    .cfi_def_cfa_offset 32
; CHECK-NEXT:    .cfi_offset w19, -8
; CHECK-NEXT:    .cfi_offset w20, -16
; CHECK-NEXT:    .cfi_offset w21, -24
; CHECK-NEXT:    .cfi_offset w30, -32
; CHECK-NEXT:    mov x19, x1
; CHECK-NEXT:    mov x20, x0
; CHECK-NEXT:    mov x21, xzr
; CHECK-NEXT:    cmp x21, x19
; CHECK-NEXT:    b.ge .LBB1_2
; CHECK-NEXT:  .LBB1_1: // %loop.body
; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
; CHECK-NEXT:    ldr w0, [x20, x21, lsl #2]
; CHECK-NEXT:    mov x1, #1450704896 // =0x56780000
; CHECK-NEXT:    movk x1, #4660, lsl #48
; CHECK-NEXT:    bl g
; CHECK-NEXT:    str w0, [x20, x21, lsl #2]
; CHECK-NEXT:    add x21, x21, #1
; CHECK-NEXT:    cmp x21, x19
; CHECK-NEXT:    b.lt .LBB1_1
; CHECK-NEXT:  .LBB1_2: // %exit
; CHECK-NEXT:    ldp x20, x19, [sp, #16] // 16-byte Folded Reload
; CHECK-NEXT:    ldp x30, x21, [sp], #32 // 16-byte Folded Reload
; CHECK-NEXT:    ret
entry:
  br label %loop

loop:
  %i = phi i64 [0, %entry], [%i.next, %loop.body]
  %c = icmp slt i64 %i, %n
  br i1 %c, label %loop.body, label %exit

loop.body:
  %p = getelementptr i32, ptr %a, i64 %i
  %v = load i32, ptr %p
  %w = call i32 @g(i32 %v, i64 1311673392922361856) ; 0x1234000056780000
  store i32 %w, ptr %p
  %i.next = add i64 %i, 1
  br label %loop

exit:
  ret void
}

declare i32 @g(i32, i64)