test/CodeGen/AArch64/GlobalISel/prelegalizercombiner-icmp-redundant-trunc.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple aarch64-apple-ios  -run-pass=aarch64-prelegalizer-combiner %s -o - -verify-machineinstrs | FileCheck %s

# This test checks the optimization to remove the G_TRUNC if we can determine it's redundant.
---
name: icmp_trunc_sextload
tracksRegLiveness: true
body:             |
  bb.1:
    liveins: $x0

    ; CHECK-LABEL: name: icmp_trunc_sextload
    ; CHECK: liveins: $x0
    ; CHECK: %v:_(p0) = COPY $x0
    ; CHECK: %load:_(s64) = G_SEXTLOAD %v(p0) :: (load 4)
    ; CHECK: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 0
    ; CHECK: %cmp:_(s1) = G_ICMP intpred(ne), %load(s64), [[C]]
    ; CHECK: [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT %cmp(s1)
    ; CHECK: $w0 = COPY [[ANYEXT]](s32)
    ; CHECK: RET_ReallyLR implicit $w0
    %v:_(p0) = COPY $x0
    %load:_(s64) = G_SEXTLOAD %v:_(p0) :: (load 4)
    %trunc:_(s32) = G_TRUNC %load(s64)
    %zero:_(s32) = G_CONSTANT i32 0
    %cmp:_(s1) = G_ICMP intpred(ne), %trunc(s32), %zero
    %5:_(s32) = G_ANYEXT %cmp
    $w0 = COPY %5(s32)
    RET_ReallyLR implicit $w0
...
---
name: icmp_trunc_sextload_eq
tracksRegLiveness: true
body:             |
  bb.1:
    liveins: $x0

    ; CHECK-LABEL: name: icmp_trunc_sextload_eq
    ; CHECK: liveins: $x0
    ; CHECK: %v:_(p0) = COPY $x0
    ; CHECK: %load:_(s64) = G_SEXTLOAD %v(p0) :: (load 4)
    ; CHECK: [[C:%[0-9]+]]:_(s64) = G_CONSTANT i64 0
    ; CHECK: %cmp:_(s1) = G_ICMP intpred(eq), %load(s64), [[C]]
    ; CHECK: [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT %cmp(s1)
    ; CHECK: $w0 = COPY [[ANYEXT]](s32)
    ; CHECK: RET_ReallyLR implicit $w0
    %v:_(p0) = COPY $x0
    %load:_(s64) = G_SEXTLOAD %v:_(p0) :: (load 4)
    %trunc:_(s32) = G_TRUNC %load(s64)
    %zero:_(s32) = G_CONSTANT i32 0
    %cmp:_(s1) = G_ICMP intpred(eq), %trunc(s32), %zero
    %5:_(s32) = G_ANYEXT %cmp
    $w0 = COPY %5(s32)
    RET_ReallyLR implicit $w0
...
---
name: icmp_trunc_sextload_wrongpred
tracksRegLiveness: true
body:             |
  bb.1:
    liveins: $x0

    ; CHECK-LABEL: name: icmp_trunc_sextload_wrongpred
    ; CHECK: liveins: $x0
    ; CHECK: %v:_(p0) = COPY $x0
    ; CHECK: %load:_(s64) = G_SEXTLOAD %v(p0) :: (load 4)
    ; CHECK: %trunc:_(s32) = G_TRUNC %load(s64)
    ; CHECK: %zero:_(s32) = G_CONSTANT i32 0
    ; CHECK: %cmp:_(s1) = G_ICMP intpred(slt), %trunc(s32), %zero
    ; CHECK: [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT %cmp(s1)
    ; CHECK: $w0 = COPY [[ANYEXT]](s32)
    ; CHECK: RET_ReallyLR implicit $w0
    %v:_(p0) = COPY $x0
    %load:_(s64) = G_SEXTLOAD %v:_(p0) :: (load 4)
    %trunc:_(s32) = G_TRUNC %load(s64)
    %zero:_(s32) = G_CONSTANT i32 0
    %cmp:_(s1) = G_ICMP intpred(slt), %trunc(s32), %zero
    %5:_(s32) = G_ANYEXT %cmp
    $w0 = COPY %5(s32)
    RET_ReallyLR implicit $w0
...
---
name: icmp_trunc_sextload_extend_mismatch
tracksRegLiveness: true
body:             |
  bb.1:
    liveins: $x0

    ; CHECK-LABEL: name: icmp_trunc_sextload_extend_mismatch
    ; CHECK: liveins: $x0
    ; CHECK: %v:_(p0) = COPY $x0
    ; CHECK: %load:_(s64) = G_SEXTLOAD %v(p0) :: (load 4)
    ; CHECK: %trunc:_(s16) = G_TRUNC %load(s64)
    ; CHECK: %zero:_(s16) = G_CONSTANT i16 0
    ; CHECK: %cmp:_(s1) = G_ICMP intpred(ne), %trunc(s16), %zero
    ; CHECK: [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT %cmp(s1)
    ; CHECK: $w0 = COPY [[ANYEXT]](s32)
    ; CHECK: RET_ReallyLR implicit $w0
    %v:_(p0) = COPY $x0
    %load:_(s64) = G_SEXTLOAD %v:_(p0) :: (load 4)
    %trunc:_(s16) = G_TRUNC %load(s64)
    %zero:_(s16) = G_CONSTANT i16 0
    %cmp:_(s1) = G_ICMP intpred(ne), %trunc(s16), %zero
    %5:_(s32) = G_ANYEXT %cmp
    $w0 = COPY %5(s32)
    RET_ReallyLR implicit $w0
...