File: select-clz.mir

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llvm-toolchain-19 1%3A19.1.7-3
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# RUN: llc -O0 -mtriple arm-- -mattr=+v6 -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s --check-prefixes=CHECK,ARM
# RUN: llc -O0 -mtriple thumb-- -mattr=+v6t2 -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s --check-prefixes=CHECK,THUMB
--- |
  define void @test_clz() { ret void }
...
---
name:            test_clz
# CHECK-LABEL: name: test_clz
legalized:       true
regBankSelected: true
selected:        false
# CHECK: selected: true
registers:
  - { id: 0, class: gprb }
  - { id: 1, class: gprb }
body:             |
  bb.0:
    liveins: $r0

    %0(s32) = COPY $r0
    ; ARM: [[VREGX:%[0-9]+]]:gpr = COPY $r0
    ; THUMB: [[VREGX:%[0-9]+]]:rgpr = COPY $r0

    %1(s32) = G_CTLZ %0(s32)
    ; ARM: [[VREGR:%[0-9]+]]:gpr = CLZ [[VREGX]], 14 /* CC::al */, $noreg
    ; THUMB: [[VREGR:%[0-9]+]]:rgpr = t2CLZ [[VREGX]], 14 /* CC::al */, $noreg

    $r0 = COPY %1(s32)
    ; CHECK: $r0 = COPY [[VREGR]]

    BX_RET 14, $noreg, implicit $r0
    ; CHECK: BX_RET 14 /* CC::al */, $noreg, implicit $r0
...