test/CodeGen/AArch64/GlobalISel/prelegalizercombiner-bzero.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64-apple-ios -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs %s -o - | FileCheck %s --check-prefix=DARWIN
# RUN: llc -mtriple aarch64 -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs %s -o - | FileCheck %s --check-prefix=UNKNOWN
#
# Check that on Darwin we can combine to G_BZERO. Without Darwin, this should
# stay as memset.

--- |
  define void @bzero_unknown_width() { unreachable }
  define void @bzero_tail_unknown_width() { unreachable }
  define void @bzero_constant_width() { unreachable }
  define void @bzero_constant_width_minsize() minsize { unreachable }
  define void @not_zero() minsize { unreachable }
...
---
name:            bzero_unknown_width
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x0, $x1
    ; Always use G_BZERO when the memset width is unknown on Darwin.

    ; DARWIN-LABEL: name: bzero_unknown_width
    ; DARWIN: liveins: $x0, $x1
    ; DARWIN: %ptr:_(p0) = COPY $x0
    ; DARWIN: %width:_(s64) = COPY $x1
    ; DARWIN: G_BZERO %ptr(p0), %width(s64), 0 :: (store 4)
    ; DARWIN: RET_ReallyLR
    ; UNKNOWN-LABEL: name: bzero_unknown_width
    ; UNKNOWN: liveins: $x0, $x1
    ; UNKNOWN: %ptr:_(p0) = COPY $x0
    ; UNKNOWN: %zero:_(s8) = G_CONSTANT i8 0
    ; UNKNOWN: %width:_(s64) = COPY $x1
    ; UNKNOWN: G_MEMSET %ptr(p0), %zero(s8), %width(s64), 0 :: (store 4)
    ; UNKNOWN: RET_ReallyLR
    %ptr:_(p0) = COPY $x0
    %zero:_(s8) = G_CONSTANT i8 0
    %width:_(s64) = COPY $x1
    G_MEMSET %ptr(p0), %zero(s8), %width(s64), 0 :: (store 4)
    RET_ReallyLR
...
---
name:            bzero_tail_unknown_width
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x0, $x1
    ; DARWIN-LABEL: name: bzero_tail_unknown_width
    ; DARWIN: liveins: $x0, $x1
    ; DARWIN: %ptr:_(p0) = COPY $x0
    ; DARWIN: %width:_(s64) = COPY $x1
    ; DARWIN: G_BZERO %ptr(p0), %width(s64), 1 :: (store 4)
    ; DARWIN: RET_ReallyLR
    ; UNKNOWN-LABEL: name: bzero_tail_unknown_width
    ; UNKNOWN: liveins: $x0, $x1
    ; UNKNOWN: %ptr:_(p0) = COPY $x0
    ; UNKNOWN: %zero:_(s8) = G_CONSTANT i8 0
    ; UNKNOWN: %width:_(s64) = COPY $x1
    ; UNKNOWN: G_MEMSET %ptr(p0), %zero(s8), %width(s64), 1 :: (store 4)
    ; UNKNOWN: RET_ReallyLR
    %ptr:_(p0) = COPY $x0
    %zero:_(s8) = G_CONSTANT i8 0
    %width:_(s64) = COPY $x1
    G_MEMSET %ptr(p0), %zero(s8), %width(s64), 1 :: (store 4)
    RET_ReallyLR
...
---
name:            bzero_constant_width
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x0, $x1
    ; For values >256, we should use G_BZERO on Darwin.

    ; DARWIN-LABEL: name: bzero_constant_width
    ; DARWIN: liveins: $x0, $x1
    ; DARWIN: %ptr:_(p0) = COPY $x0
    ; DARWIN: %width:_(s64) = G_CONSTANT i64 1024
    ; DARWIN: G_BZERO %ptr(p0), %width(s64), 0 :: (store 4)
    ; DARWIN: RET_ReallyLR
    ; UNKNOWN-LABEL: name: bzero_constant_width
    ; UNKNOWN: liveins: $x0, $x1
    ; UNKNOWN: %ptr:_(p0) = COPY $x0
    ; UNKNOWN: %zero:_(s8) = G_CONSTANT i8 0
    ; UNKNOWN: %width:_(s64) = G_CONSTANT i64 1024
    ; UNKNOWN: G_MEMSET %ptr(p0), %zero(s8), %width(s64), 0 :: (store 4)
    ; UNKNOWN: RET_ReallyLR
    %ptr:_(p0) = COPY $x0
    %zero:_(s8) = G_CONSTANT i8 0
    %width:_(s64) = G_CONSTANT i64 1024
    G_MEMSET %ptr(p0), %zero(s8), %width(s64), 0 :: (store 4)
    RET_ReallyLR
...
---
name:            bzero_constant_width_minsize
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x0, $x1
    ; With minsize, we should always use G_BZERO to avoid a copy from wzr.

    ; DARWIN-LABEL: name: bzero_constant_width_minsize
    ; DARWIN: liveins: $x0, $x1
    ; DARWIN: %ptr:_(p0) = COPY $x0
    ; DARWIN: %width:_(s64) = G_CONSTANT i64 256
    ; DARWIN: G_BZERO %ptr(p0), %width(s64), 0 :: (store 4)
    ; DARWIN: RET_ReallyLR
    ; UNKNOWN-LABEL: name: bzero_constant_width_minsize
    ; UNKNOWN: liveins: $x0, $x1
    ; UNKNOWN: %ptr:_(p0) = COPY $x0
    ; UNKNOWN: %zero:_(s8) = G_CONSTANT i8 0
    ; UNKNOWN: %width:_(s64) = G_CONSTANT i64 256
    ; UNKNOWN: G_MEMSET %ptr(p0), %zero(s8), %width(s64), 0 :: (store 4)
    ; UNKNOWN: RET_ReallyLR
    %ptr:_(p0) = COPY $x0
    %zero:_(s8) = G_CONSTANT i8 0
    %width:_(s64) = G_CONSTANT i64 256
    G_MEMSET %ptr(p0), %zero(s8), %width(s64), 0 :: (store 4)
    RET_ReallyLR
...
---
name:            not_zero
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x0, $x1
    ; When the value isn't 0, don't create G_BZERO.

    ; DARWIN-LABEL: name: not_zero
    ; DARWIN: liveins: $x0, $x1
    ; DARWIN: %ptr:_(p0) = COPY $x0
    ; DARWIN: %not_zero:_(s8) = G_CONSTANT i8 1
    ; DARWIN: %width:_(s64) = G_CONSTANT i64 256
    ; DARWIN: G_MEMSET %ptr(p0), %not_zero(s8), %width(s64), 0 :: (store 4)
    ; DARWIN: RET_ReallyLR
    ; UNKNOWN-LABEL: name: not_zero
    ; UNKNOWN: liveins: $x0, $x1
    ; UNKNOWN: %ptr:_(p0) = COPY $x0
    ; UNKNOWN: %not_zero:_(s8) = G_CONSTANT i8 1
    ; UNKNOWN: %width:_(s64) = G_CONSTANT i64 256
    ; UNKNOWN: G_MEMSET %ptr(p0), %not_zero(s8), %width(s64), 0 :: (store 4)
    ; UNKNOWN: RET_ReallyLR
    %ptr:_(p0) = COPY $x0
    %not_zero:_(s8) = G_CONSTANT i8 1
    %width:_(s64) = G_CONSTANT i64 256
    G_MEMSET %ptr(p0), %not_zero(s8), %width(s64), 0 :: (store 4)
    RET_ReallyLR