llvm/test/CodeGen/AArch64/GlobalISel/fold-select.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -O0 -mtriple=aarch64 -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s
#
# Verify that we can fold compares into integer selects.
#
# This is an integer version of fold-fp-select.mir.
#

...
---
name:            eq
alignment:       4
legalized:       true
regBankSelected: true
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $w0, $w1

    ; CHECK-LABEL: name: eq
    ; CHECK: liveins: $w0, $w1
    ; CHECK: [[COPY:%[0-9]+]]:gpr32sp = COPY $w0
    ; CHECK: [[COPY1:%[0-9]+]]:gpr32 = COPY $w1
    ; CHECK: [[COPY2:%[0-9]+]]:gpr32 = COPY $wzr
    ; CHECK: $wzr = SUBSWri [[COPY]], 0, 0, implicit-def $nzcv
    ; CHECK: [[CSELWr:%[0-9]+]]:gpr32 = CSELWr [[COPY2]], [[COPY1]], 0, implicit $nzcv
    ; CHECK: $w0 = COPY [[CSELWr]]
    ; CHECK: RET_ReallyLR implicit $w0
    %0:gpr(s32) = COPY $w0
    %1:gpr(s32) = COPY $w1
    %2:gpr(s32) = G_CONSTANT i32 0
    %5:gpr(s32) = G_ICMP intpred(eq), %0(s32), %2
    %3:gpr(s1) = G_TRUNC %5(s32)
    %4:gpr(s32) = G_SELECT %3(s1), %2, %1
    $w0 = COPY %4(s32)
    RET_ReallyLR implicit $w0

...
---
name:            using_fcmp
alignment:       4
legalized:       true
regBankSelected: true
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $s0, $w0, $w1

    ; CHECK-LABEL: name: using_fcmp
    ; CHECK: liveins: $s0, $w0, $w1
    ; CHECK: [[COPY:%[0-9]+]]:gpr32 = COPY $w1
    ; CHECK: [[COPY1:%[0-9]+]]:fpr32 = COPY $s0
    ; CHECK: [[COPY2:%[0-9]+]]:gpr32 = COPY $wzr
    ; CHECK: FCMPSri [[COPY1]], implicit-def $nzcv
    ; CHECK: [[CSELWr:%[0-9]+]]:gpr32 = CSELWr [[COPY2]], [[COPY]], 0, implicit $nzcv
    ; CHECK: $w0 = COPY [[CSELWr]]
    ; CHECK: RET_ReallyLR implicit $w0
    %1:gpr(s32) = COPY $w1
    %2:fpr(s32) = COPY $s0
    %3:fpr(s32) = G_FCONSTANT float 0.000000e+00
    %6:gpr(s32) = G_CONSTANT i32 0
    %7:gpr(s32) = G_FCMP floatpred(oeq), %2(s32), %3
    %4:gpr(s1) = G_TRUNC %7(s32)
    %5:gpr(s32) = G_SELECT %4(s1), %6, %1
    $w0 = COPY %5(s32)
    RET_ReallyLR implicit $w0

...
---
name:            check_update_predicate
alignment:       4
legalized:       true
regBankSelected: true
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $w0, $w1
    ; The G_ICMP is optimized here to be a slt comparison by adding 1 to the
    ; constant. So, the CSELWr should use the predicate code 11, rather than
    ; 13.

    ; CHECK-LABEL: name: check_update_predicate
    ; CHECK: liveins: $w0, $w1
    ; CHECK: %copy1:gpr32sp = COPY $w0
    ; CHECK: %copy2:gpr32 = COPY $w1
    ; CHECK: %cst:gpr32 = MOVi32imm -1
    ; CHECK: $wzr = SUBSWri %copy1, 0, 0, implicit-def $nzcv
    ; CHECK: %select:gpr32 = CSELWr %cst, %copy2, 11, implicit $nzcv
    ; CHECK: $w0 = COPY %select
    ; CHECK: RET_ReallyLR implicit $w0
    %copy1:gpr(s32) = COPY $w0
    %copy2:gpr(s32) = COPY $w1
    %cst:gpr(s32) = G_CONSTANT i32 -1
    %cmp:gpr(s32) = G_ICMP intpred(sle), %copy1(s32), %cst
    %trunc:gpr(s1) = G_TRUNC %cmp(s32)
    %select:gpr(s32) = G_SELECT %trunc(s1), %cst, %copy2
    $w0 = COPY %select(s32)
    RET_ReallyLR implicit $w0
...