llvm/test/CodeGen/AArch64/aarch64-vector-pcs.mir

# RUN: llc -mtriple=aarch64-linux-gnu -run-pass=prolog-epilog %s -o - | FileCheck %s

# The tests below test the allocation of 128bit callee-saves
# on the stack, specifically their offsets.

# Padding of GPR64-registers is needed to ensure 16 byte alignment of
# the stack pointer after the GPR64/FPR64 block (which is also needed
# for the FPR128 saves when present).

# This file also tests whether an emergency stack slot is allocated
# when the stack frame is over a given size, caused by a series of
# FPR128 saves. The alignment can leave a gap that can be scavenged
# for stack slot scavenging, so it is important that the stack size
# is properly estimated.


--- |

  ; ModuleID = '<stdin>'
  source_filename = "<stdin>"
  target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64-unknown-linux-gnu"

  ; Function Attrs: nounwind
  define aarch64_vector_pcs void @test_q10_q11_x19() nounwind { entry: unreachable }

  ; Function Attrs: nounwind
  define aarch64_vector_pcs void @test_q10_q11_x19_x20() nounwind { entry: unreachable }

  ; Function Attrs: nounwind
  define aarch64_vector_pcs void @test_q10_q11_x19_x20_x21() nounwind { entry: unreachable }

  ; Function Attrs: nounwind
  define aarch64_vector_pcs void @test_q8_to_q23_x19_to_x30() nounwind { entry: unreachable }

  ; Function Attrs: nounwind
  define aarch64_vector_pcs void @test_q8_to_q23_x19_to_x30_preinc() nounwind { entry: unreachable }

...
---
name:            test_q10_q11_x19
tracksRegLiveness: true
body:             |
  bb.0.entry:
  $x19 = IMPLICIT_DEF
  $q10 = IMPLICIT_DEF
  $q11 = IMPLICIT_DEF

  ; Check that the alignment gap for the 8-byte x19 is padded
  ; with another 8 bytes. The CSR region will look like this:
  ;    +-------------------+
  ;    |/////padding///////|        (8 bytes)
  ;    |       X19         |        (8 bytes)
  ;    +-------------------+ <-  SP -16
  ;    |     Q10, Q11      |        (32 bytes)
  ;    +-------------------+ <-  SP -48

  ; CHECK-LABEL: test_q10_q11_x19{{[[:space:]]}}
  ; CHECK-DAG: $sp = frame-setup STPQpre killed $q11, killed $q10, $sp, -3 :: (store (s128) into %stack.[[Q11:[0-9]+]]), (store (s128) into %stack.[[Q10:[0-9]+]])
  ; CHECK-DAG: - { id: [[Q11]], {{.*}}, offset: -48, size: 16, alignment: 16
  ; CHECK-DAG: - { id: [[Q10]], {{.*}}, offset: -32, size: 16, alignment: 16
  ; CHECK-DAG: frame-setup STRXui killed $x19, $sp, 4 :: (store (s64) into %stack.[[X19:[0-9]+]])
  ; CHECK-DAG: - { id: [[X19]], {{.*}}, offset: -16, size: 8, alignment: 16

...
---
name:            test_q10_q11_x19_x20
alignment:       4
tracksRegLiveness: true
body:             |
  bb.0.entry:
  $x19 = IMPLICIT_DEF
  $x20 = IMPLICIT_DEF
  $q10 = IMPLICIT_DEF
  $q11 = IMPLICIT_DEF

  ;    +-------------------+
  ;    |     X19, X20      |        (16 bytes)
  ;    +-------------------+ <-  SP -16
  ;    |     Q10, Q11      |        (32 bytes)
  ;    +-------------------+ <-  SP -48

  ; CHECK-LABEL: test_q10_q11_x19_x20{{[[:space:]]}}
  ; CHECK-DAG: $sp = frame-setup STPQpre killed $q11, killed $q10, $sp, -3 :: (store (s128) into %stack.[[Q11:[0-9]+]]), (store (s128) into %stack.[[Q10:[0-9]+]])
  ; CHECK-DAG: frame-setup STPXi killed $x20, killed $x19, $sp, 4 :: (store (s64) into %stack.[[X20:[0-9]+]]), (store (s64) into %stack.[[X19:[0-9]+]])
  ; CHECK-DAG: - { id: [[Q11]], {{.*}}, offset: -48, size: 16, alignment: 16
  ; CHECK-DAG: - { id: [[Q10]], {{.*}}, offset: -32, size: 16, alignment: 16
  ; CHECK-DAG: - { id: [[X20]], {{.*}}, offset: -16, size: 8, alignment: 8
  ; CHECK-DAG: - { id: [[X19]], {{.*}}, offset:  -8, size: 8, alignment: 8

...
---
name:            test_q10_q11_x19_x20_x21
tracksRegLiveness: true
body:             |
  bb.0.entry:
  $x19 = IMPLICIT_DEF
  $x20 = IMPLICIT_DEF
  $x21 = IMPLICIT_DEF
  $q10 = IMPLICIT_DEF
  $q11 = IMPLICIT_DEF

  ; Check that the alignment gap is padded with another 8 bytes.
  ; The CSR region will look like this:
  ;    +-------------------+
  ;    |     X19, X20      |        (16 bytes)
  ;    +-------------------+ <-  SP -16
  ;    |/////padding///////|        (8 bytes)
  ;    |        X21        |        (8 bytes)
  ;    +-------------------+ <-  SP -32
  ;    |     Q10, Q11      |        (32 bytes)
  ;    +-------------------+ <-  SP -64

  ; CHECK-LABEL: test_q10_q11_x19_x20_x21
  ; CHECK-DAG: $sp = frame-setup STPQpre killed $q11, killed $q10, $sp, -4 :: (store (s128) into %stack.[[Q11:[0-9]+]]), (store (s128) into %stack.[[Q10:[0-9]+]])
  ; CHECK-DAG: frame-setup STRXui killed $x21, $sp, 4 :: (store (s64) into %stack.[[X21:[0-9]+]])
  ; CHECK-DAG: frame-setup STPXi killed $x20, killed $x19, $sp, 6
  ; CHECK-DAG: - { id: [[Q11]], {{.*}}, offset: -64, size: 16, alignment: 16
  ; CHECK-DAG: - { id: [[Q10]], {{.*}}, offset: -48, size: 16, alignment: 16
  ; CHECK-DAG: - { id: [[X21]], {{.*}}, offset: -32, size: 8, alignment: 16

...
---
name:            test_q8_to_q23_x19_to_x30
tracksRegLiveness: true
body:             |
  bb.0.entry:
  $x19 = IMPLICIT_DEF
  $x20 = IMPLICIT_DEF
  $x21 = IMPLICIT_DEF
  $x22 = IMPLICIT_DEF
  $x23 = IMPLICIT_DEF
  $x24 = IMPLICIT_DEF
  $x25 = IMPLICIT_DEF
  $x26 = IMPLICIT_DEF
  $x27 = IMPLICIT_DEF
  $x28 = IMPLICIT_DEF
  $fp = IMPLICIT_DEF
  $lr = IMPLICIT_DEF
  $q8 = IMPLICIT_DEF
  $q9 = IMPLICIT_DEF
  $q10 = IMPLICIT_DEF
  $q11 = IMPLICIT_DEF
  $q12 = IMPLICIT_DEF
  $q13 = IMPLICIT_DEF
  $q14 = IMPLICIT_DEF
  $q15 = IMPLICIT_DEF
  $q16 = IMPLICIT_DEF
  $q17 = IMPLICIT_DEF
  $q18 = IMPLICIT_DEF
  $q19 = IMPLICIT_DEF
  $q20 = IMPLICIT_DEF
  $q21 = IMPLICIT_DEF
  $q22 = IMPLICIT_DEF
  $q23 = IMPLICIT_DEF

  ; Test with more callee saves, which triggers 'BigStack' in
  ; AArch64FrameLowering which in turn causes an emergency spill
  ; slot to be allocated. The emergency spill slot is allocated
  ; as close as possible to SP, so at SP + 0.
  ;    +-------------------+
  ;    |     X19..X30      |        (96 bytes)
  ;    +-------------------+ <-  SP -96
  ;    |      Q8..Q23      |        (256 bytes)
  ;    +-------------------+ <-  SP -352
  ;    |   emergency slot  |        (16 bytes)
  ;    +-------------------+ <-  SP -368

  ; CHECK-LABEL: test_q8_to_q23_x19_to_x30
  ; CHECK: $sp = frame-setup SUBXri $sp, 368, 0
  ; CHECK-NEXT: frame-setup STPQi killed $q23, killed $q22, $sp, 1 :: (store (s128) into %stack.{{[0-9]+}}), (store (s128) into %stack.{{[0-9]+}})
  ; CHECK-NEXT: frame-setup STPQi killed $q21, killed $q20, $sp, 3
  ; CHECK-NEXT: frame-setup STPQi killed $q19, killed $q18, $sp, 5
  ; CHECK-NEXT: frame-setup STPQi killed $q17, killed $q16, $sp, 7
  ; CHECK-NEXT: frame-setup STPQi killed $q15, killed $q14, $sp, 9
  ; CHECK-NEXT: frame-setup STPQi killed $q13, killed $q12, $sp, 11
  ; CHECK-NEXT: frame-setup STPQi killed $q11, killed $q10, $sp, 13
  ; CHECK-NEXT: frame-setup STPQi killed $q9, killed $q8, $sp, 15
  ; CHECK-NEXT: frame-setup STPXi killed $fp, killed $lr, $sp, 34 :: (store (s64) into %stack.{{[0-9]+}}), (store (s64) into %stack.{{[0-9]+}})
  ; CHECK-NEXT: frame-setup STPXi killed $x28, killed $x27, $sp, 36
  ; CHECK-NEXT: frame-setup STPXi killed $x26, killed $x25, $sp, 38
  ; CHECK-NEXT: frame-setup STPXi killed $x24, killed $x23, $sp, 40
  ; CHECK-NEXT: frame-setup STPXi killed $x22, killed $x21, $sp, 42
  ; CHECK-NEXT: frame-setup STPXi killed $x20, killed $x19, $sp, 44

...
---
name:            test_q8_to_q23_x19_to_x30_preinc
tracksRegLiveness: true
stack:
  - { id: 0, size: 160, alignment: 4, local-offset: 0 }
constants:
body:             |
  bb.0.entry:
  $x19 = IMPLICIT_DEF
  $x20 = IMPLICIT_DEF
  $x21 = IMPLICIT_DEF
  $x22 = IMPLICIT_DEF
  $x23 = IMPLICIT_DEF
  $x24 = IMPLICIT_DEF
  $x25 = IMPLICIT_DEF
  $x26 = IMPLICIT_DEF
  $x27 = IMPLICIT_DEF
  $x28 = IMPLICIT_DEF
  $fp = IMPLICIT_DEF
  $lr = IMPLICIT_DEF
  $q8 = IMPLICIT_DEF
  $q9 = IMPLICIT_DEF
  $q10 = IMPLICIT_DEF
  $q11 = IMPLICIT_DEF
  $q12 = IMPLICIT_DEF
  $q13 = IMPLICIT_DEF
  $q14 = IMPLICIT_DEF
  $q15 = IMPLICIT_DEF
  $q16 = IMPLICIT_DEF
  $q17 = IMPLICIT_DEF
  $q18 = IMPLICIT_DEF
  $q19 = IMPLICIT_DEF
  $q20 = IMPLICIT_DEF
  $q21 = IMPLICIT_DEF
  $q22 = IMPLICIT_DEF
  $q23 = IMPLICIT_DEF

  ; When the total stack size >= 512, it will use the pre-increment
  ; rather than the 'sub sp, sp, <size>'.
  ;    +-------------------+
  ;    |     X19..X30      |        (96 bytes)
  ;    +-------------------+ <-  SP -96
  ;    |      Q8..Q23      |        (256 bytes)
  ;    +-------------------+ <-  SP -352
  ;    |       'obj'       |        (32 bytes)
  ;    +-------------------+ <-  SP -384
  ;    |   emergency slot  |        (16 bytes)
  ;    +-------------------+ <-  SP -400

  ; CHECK-LABEL: test_q8_to_q23_x19_to_x30_preinc
  ; CHECK: $sp = frame-setup STPQpre killed $q23, killed $q22, $sp, -22 :: (store (s128) into %stack.{{[0-9]+}}), (store (s128) into %stack.{{[0-9]+}})
  ; CHECK-NEXT: frame-setup STPQi killed $q21, killed $q20, $sp, 2
  ; CHECK-NEXT: frame-setup STPQi killed $q19, killed $q18, $sp, 4
  ; CHECK-NEXT: frame-setup STPQi killed $q17, killed $q16, $sp, 6
  ; CHECK-NEXT: frame-setup STPQi killed $q15, killed $q14, $sp, 8
  ; CHECK-NEXT: frame-setup STPQi killed $q13, killed $q12, $sp, 10
  ; CHECK-NEXT: frame-setup STPQi killed $q11, killed $q10, $sp, 12
  ; CHECK-NEXT: frame-setup STPQi killed $q9, killed $q8, $sp, 14
  ; CHECK-NEXT: frame-setup STPXi killed $fp, killed $lr, $sp, 32 :: (store (s64) into %stack.{{[0-9]+}}), (store (s64) into %stack.{{[0-9]+}})
  ; CHECK-NEXT: frame-setup STPXi killed $x28, killed $x27, $sp, 34
  ; CHECK-NEXT: frame-setup STPXi killed $x26, killed $x25, $sp, 36
  ; CHECK-NEXT: frame-setup STPXi killed $x24, killed $x23, $sp, 38
  ; CHECK-NEXT: frame-setup STPXi killed $x22, killed $x21, $sp, 40
  ; CHECK-NEXT: frame-setup STPXi killed $x20, killed $x19, $sp, 42
  ; CHECK-NEXT: $sp = frame-setup SUBXri $sp, 176, 0

...