llvm/test/CodeGen/AArch64/sve-ptest-removal-rdffr.mir

# RUN: llc -mtriple=aarch64--linux-gnu -mattr=+sve -run-pass=peephole-opt -verify-machineinstrs %s -o - | FileCheck %s
# Test that RDFFR followed by PTEST is replaced with RDFFRS.
---
# CHECK-LABEL: name:{{\s*}} substitute_rdffr_pp_with_rdffrs_pp
name:                       substitute_rdffr_pp_with_rdffrs_pp
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $ffr, $p0
    %0:ppr_3b = COPY $p0

    ; CHECK: RDFFRS_PPz
    ; CHECK-NOT: PTEST
    %1:ppr_3b = RDFFR_PPz %0:ppr_3b
    PTEST_PP killed %0:ppr_3b, killed %1:ppr_3b, implicit-def $nzcv

    ; Consume nzcv
    %2:gpr32 = COPY $wzr
    %3:gpr32 = CSINCWr killed %2, $wzr, 0, implicit $nzcv
    $w0 = COPY %3
    RET_ReallyLR implicit $w0
...
---
# CHECK-LABEL: name:{{\s*}} fail_to_substitute_rdffr_pp_with_rdffrs_pp_differing_mask
name:                       fail_to_substitute_rdffr_pp_with_rdffrs_pp_differing_mask
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $ffr, $p0, $p1
    %0:ppr_3b = COPY $p0
    %1:ppr_3b = COPY $p1

    ; CHECK: RDFFR_PPz
    ; CHECK: PTEST
    %2:ppr_3b = RDFFR_PPz %0:ppr_3b
    PTEST_PP killed %1:ppr_3b, killed %2:ppr_3b, implicit-def $nzcv

    ; Consume nzcv
    %3:gpr32 = COPY $wzr
    %4:gpr32 = CSINCWr killed %3, $wzr, 0, implicit $nzcv
    $w0 = COPY %4
    RET_ReallyLR implicit $w0
...
---
# CHECK-LABEL: name:{{\s*}} fail_to_substitute_rdffr_pp_with_rdffrs_pp_nzcv_clobbered
name:                       fail_to_substitute_rdffr_pp_with_rdffrs_pp_nzcv_clobbered
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $ffr, $p0, $x0
    %0:ppr_3b = COPY $p0

    ; CHECK: RDFFR_PPz
    ; CHECK-NEXT: ADDSXrr
    ; CHECK-NEXT: PTEST_PP
    %1:ppr_3b = RDFFR_PPz %0:ppr_3b
    ; Clobber nzcv
    $x0 = ADDSXrr $x0, $x0, implicit-def $nzcv
    PTEST_PP killed %0:ppr_3b, killed %1:ppr_3b, implicit-def $nzcv

    ; Consume nzcv
    %2:gpr32 = COPY $wzr
    %3:gpr32 = CSINCWr killed %2, $wzr, 0, implicit $nzcv
    $w0 = COPY %3
    RET_ReallyLR implicit $w0
...
---
# CHECK-LABEL: name:{{\s*}} fail_to_substitute_rdffr_pp_with_rdffrs_pp_nzcv_flags_used_between
name:                       fail_to_substitute_rdffr_pp_with_rdffrs_pp_nzcv_flags_used_between
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $ffr, $p0, $x0
    %0:ppr_3b = COPY $p0

    $wzr = SUBSWri $w0, 0, 0, implicit-def $nzcv

    ; CHECK: RDFFR_PPz
    ; CHECK-NEXT: CSINCWr
    ; CHECK-NEXT: PTEST_PP
    %1:ppr_3b = RDFFR_PPz %0:ppr_3b
    ; Consume nzcv
    %2:gpr32 = CSINCWr $wzr, $wzr, 0, implicit $nzcv
    PTEST_PP killed %0:ppr_3b, killed %1:ppr_3b, implicit-def $nzcv

    ; Consume nzcv
    %3:gpr32 = COPY $wzr
    %4:gpr32 = CSINCWr killed %3, $wzr, 0, implicit $nzcv
    $w0 = ORRWrs %4, %2, 1
    RET_ReallyLR implicit $w0