src/third_party/llvm-project/llvm/test/CodeGen/ARM/peephole-phi.mir

# RUN: llc -o - %s -mtriple=armv7-- -verify-machineinstrs -run-pass=peephole-opt | FileCheck %s
#
# Make sure we do not crash on this input.
# Note that this input could in principle be optimized, but right now we don't
# have this case implemented so the output should simply be unchanged.
#
# CHECK-LABEL: name: func
# CHECK: body: |
# CHECK:   bb.0:
# CHECK:     Bcc %bb.2, 1, undef $cpsr
#
# CHECK:   bb.1:
# CHECK:     %0:dpr = IMPLICIT_DEF
# CHECK:     %1:gpr, %2:gpr = VMOVRRD %0, 14, $noreg
# CHECK:     B %bb.3
#
# CHECK:   bb.2:
# CHECK:     %3:spr = IMPLICIT_DEF
# CHECK:     %4:gpr = VMOVRS %3, 14, $noreg
#
# CHECK:   bb.3:
# CHECK:     %5:gpr = PHI %1, %bb.1, %4, %bb.2
# CHECK:     %6:spr = VMOVSR %5, 14, $noreg
---
name: func0
tracksRegLiveness: true
body: |
  bb.0:
    Bcc %bb.2, 1, undef $cpsr

  bb.1:
    %0:dpr = IMPLICIT_DEF
    %1:gpr, %2:gpr = VMOVRRD %0:dpr, 14, $noreg
    B %bb.3

  bb.2:
    %3:spr = IMPLICIT_DEF
    %4:gpr = VMOVRS %3:spr, 14, $noreg

  bb.3:
    %5:gpr = PHI %1, %bb.1, %4, %bb.2
    %6:spr = VMOVSR %5, 14, $noreg
...

# CHECK-LABEL: name: func1
# CHECK:    %6:spr = PHI %0, %bb.1, %2, %bb.2
# CHEKC:    %7:spr = COPY %6
---
name: func1
tracksRegLiveness: true
body: |
  bb.0:
    Bcc %bb.2, 1, undef $cpsr

  bb.1:
    %1:spr = IMPLICIT_DEF
    %0:gpr = VMOVRS %1, 14, $noreg
    B %bb.3

  bb.2:
    %3:spr = IMPLICIT_DEF
    %2:gpr = VMOVRS %3:spr, 14, $noreg

  bb.3:
    %4:gpr = PHI %0, %bb.1, %2, %bb.2
    %5:spr = VMOVSR %4, 14, $noreg
...

# The current implementation doesn't perform any transformations if undef
# operands are involved.
# CHECK-LABEL: name: func-undefops
# CHECK: body: |
# CHECK:   bb.0:
# CHECK:     Bcc %bb.2, 1, undef $cpsr
#
# CHECK:   bb.1:
# CHECK:     %0:gpr = VMOVRS undef %1:spr, 14, $noreg
# CHECK:     B %bb.3
#
# CHECK:   bb.2:
# CHECK:     %2:gpr = VMOVRS undef %3:spr, 14, $noreg
#
# CHECK:   bb.3:
# CHECK:     %4:gpr = PHI %0, %bb.1, %2, %bb.2
# CHECK:     %5:spr = VMOVSR %4, 14, $noreg
---
name: func-undefops
tracksRegLiveness: true
body: |
  bb.0:
    Bcc %bb.2, 1, undef $cpsr

  bb.1:
    %0:gpr = VMOVRS undef %1:spr, 14, $noreg
    B %bb.3

  bb.2:
    %2:gpr = VMOVRS undef %3:spr, 14, $noreg

  bb.3:
    %4:gpr = PHI %0, %bb.1, %2, %bb.2
    %5:spr = VMOVSR %4, 14, $noreg
...