test/CodeGen/AMDGPU/s_or_saveexec_xor_combine.mir

# RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=+wavefrontsize32 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck --check-prefixes=GCN,WAVE32 %s
# RUN: llc -march=amdgcn -mcpu=gfx1010 -mattr=-wavefrontsize32,+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck --check-prefixes=GCN,WAVE64 %s

---

# After the Optimize exec masking (post-RA) pass, codegen can end up with the following sequence:
# s_or_saveexec_b32 s0, s0
# s_xor_b32 exec_lo, exec_lo, s0
#
# This can be combined into one instruction:
# s_andn2_saveexec_b32 s0, s0

# Ensure the transformation gets applied in the b32 case.
# GCN-LABEL: name: s_or_saveexec_xor_combine_b32
# WAVE32: S_ANDN2_SAVEEXEC_B32
name: s_or_saveexec_xor_combine_b32
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr0, implicit-def $exec, implicit-def $scc, implicit $exec
    $exec_lo = S_XOR_B32 $exec_lo, renamable $sgpr0, implicit-def $scc
...

---

# Ensure the transformation gets applied in the b64 case.
# GCN-LABEL: name: s_or_saveexec_xor_combine_b64
# WAVE64: S_ANDN2_SAVEEXEC_B64
name: s_or_saveexec_xor_combine_b64
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0_sgpr1
    renamable $sgpr0_sgpr1 = S_OR_SAVEEXEC_B64 killed renamable $sgpr0_sgpr1, implicit-def $exec, implicit-def $scc, implicit $exec
    $exec = S_XOR_B64 $exec, renamable $sgpr0_sgpr1, implicit-def $scc
...

---

# Ensure the transformation does get applied even if the operands are swapped.
# GCN-LABEL: name: s_or_saveexec_xor_combine_b32_swap
# WAVE32: S_ANDN2_SAVEEXEC_B32
name: s_or_saveexec_xor_combine_b32_swap
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr0, implicit-def $exec, implicit-def $scc, implicit $exec
    $exec_lo = S_XOR_B32 renamable $sgpr0, $exec_lo, implicit-def $scc
...

---

# Ensure the transformation does get applied if source and dest operand for s_or_saveeexec are not equal.
# GCN-LABEL: name: s_or_saveexec_xor_combine_b32_inequal_operands
# WAVE32: S_ANDN2_SAVEEXEC
name: s_or_saveexec_xor_combine_b32_inequal_operands
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0, $sgpr1
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr1, implicit-def $exec, implicit-def $scc, implicit $exec
    $exec_lo = S_XOR_B32 $exec_lo, renamable $sgpr0, implicit-def $scc
...

---

# Ensure the transformation does not get applied if s_xor does not use the dest as input operand.
# GCN-LABEL: name: s_or_saveexec_xor_combine_b32_wrong_input
# WAVE32: S_OR_SAVEEXEC
# WAVE32: S_XOR_B32
name: s_or_saveexec_xor_combine_b32_wrong_input
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0, $sgpr1
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr0, implicit-def $exec, implicit-def $scc, implicit $exec
    $exec_lo = S_XOR_B32 $exec_lo, renamable $sgpr1, implicit-def $scc
...

---


# Ensure the transformation does not get applied if the instructions don't appear sequentially.
# GCN-LABEL: name: s_or_saveexec_xor_combine_b32_non_sequence
# WAVE32: S_OR_SAVEEXEC
# WAVE32: S_MOV_B32
# WAVE32: S_XOR_B32
name: s_or_saveexec_xor_combine_b32_non_sequence
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0, $sgpr1
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr0, implicit-def $exec, implicit-def $scc, implicit $exec
    renamable $sgpr1 = S_MOV_B32 renamable $sgpr0
    $exec_lo = S_XOR_B32 $exec_lo, renamable $sgpr1, implicit-def $scc
...

---

# Don't apply the transformation if the basic block only has a single instruction.

# GCN-LABEL: name: s_or_saveexec_xor_combine_b32_last_inst
# WAVE32: S_OR_SAVEEXEC
name: s_or_saveexec_xor_combine_b32_last_inst
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr0, implicit-def $exec, implicit-def $scc, implicit $exec
...

---

# Don't apply the transformation if the basic block ends with an S_OR_SAVEEXEC_B32 instruction.

# GCN-LABEL: name: s_or_saveexec_xor_combine_b32_or_saveexec_terminator
# WAVE32: S_MOV_B32
# WAVE32: S_OR_SAVEEXEC
name: s_or_saveexec_xor_combine_b32_or_saveexec_terminator
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $sgpr0, $sgpr1
    renamable $sgpr1 = S_MOV_B32 renamable $sgpr0
    renamable $sgpr0 = S_OR_SAVEEXEC_B32 killed renamable $sgpr0, implicit-def $exec, implicit-def $scc, implicit $exec