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

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -debugify-and-strip-all-safe -O0 -run-pass=aarch64-prelegalizer-combiner --aarch64prelegalizercombinerhelper-only-enable-rule="opt_brcond_by_inverting_cond" -global-isel -verify-machineinstrs %s -o - | FileCheck %s

# Need asserts for the only-enable-rule to work.

# REQUIRES: asserts

--- |
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
  target triple = "arm64-apple-ios5.0.0"

  define i32 @foo(i32 %a, i32 %b) {
  entry:
    %cmp = icmp sgt i32 %a, 0
    br i1 %cmp, label %if.then, label %if.end

  if.then:
    %add = add nsw i32 %b, %a
    %add1 = add nsw i32 %a, %b
    br label %return

  if.end:
    %mul = mul nsw i32 %b, %b
    %add2 = add nuw nsw i32 %mul, 2
    br label %return

  return:
    %retval.0 = phi i32 [ %add1, %if.then ], [ %add2, %if.end ]
    ret i32 %retval.0
  }

  define void @dont_combine_same_block() { ret void }

...
---
name:            foo
tracksRegLiveness: true
body:             |
  ; CHECK-LABEL: name: foo
  ; CHECK: bb.0.entry:
  ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
  ; CHECK:   liveins: $w0, $w1
  ; CHECK:   [[COPY:%[0-9]+]]:_(s32) = COPY $w0
  ; CHECK:   [[COPY1:%[0-9]+]]:_(s32) = COPY $w1
  ; CHECK:   [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 0
  ; CHECK:   [[C1:%[0-9]+]]:_(s32) = G_CONSTANT i32 2
  ; CHECK:   [[ICMP:%[0-9]+]]:_(s1) = G_ICMP intpred(sgt), [[COPY]](s32), [[C]]
  ; CHECK:   [[C2:%[0-9]+]]:_(s1) = G_CONSTANT i1 true
  ; CHECK:   [[XOR:%[0-9]+]]:_(s1) = G_XOR [[ICMP]], [[C2]]
  ; CHECK:   G_BRCOND [[XOR]](s1), %bb.2
  ; CHECK:   G_BR %bb.1
  ; CHECK: bb.1.if.then:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[ADD:%[0-9]+]]:_(s32) = nsw G_ADD [[COPY1]], [[COPY]]
  ; CHECK:   [[ADD1:%[0-9]+]]:_(s32) = nsw G_ADD [[ADD]], [[COPY1]]
  ; CHECK:   G_BR %bb.3
  ; CHECK: bb.2.if.end:
  ; CHECK:   successors: %bb.3(0x80000000)
  ; CHECK:   [[MUL:%[0-9]+]]:_(s32) = nsw G_MUL [[COPY1]], [[COPY1]]
  ; CHECK:   [[ADD2:%[0-9]+]]:_(s32) = nuw nsw G_ADD [[MUL]], [[C1]]
  ; CHECK: bb.3.return:
  ; CHECK:   [[PHI:%[0-9]+]]:_(s32) = G_PHI [[ADD1]](s32), %bb.1, [[ADD2]](s32), %bb.2
  ; CHECK:   $w0 = COPY [[PHI]](s32)
  ; CHECK:   RET_ReallyLR implicit $w0
  bb.1.entry:
    liveins: $w0, $w1

    %0:_(s32) = COPY $w0
    %1:_(s32) = COPY $w1
    %2:_(s32) = G_CONSTANT i32 0
    %5:_(s32) = G_CONSTANT i32 2
    %3:_(s1) = G_ICMP intpred(sgt), %0(s32), %2
    G_BRCOND %3(s1), %bb.2
    G_BR %bb.3

  bb.2.if.then:
    %7:_(s32) = nsw G_ADD %1, %0
    %8:_(s32) = nsw G_ADD %7, %1
    G_BR %bb.4

  bb.3.if.end:
    %4:_(s32) = nsw G_MUL %1, %1
    %6:_(s32) = nuw nsw G_ADD %4, %5

  bb.4.return:
    %10:_(s32) = G_PHI %8(s32), %bb.2, %6(s32), %bb.3
    $w0 = COPY %10(s32)
    RET_ReallyLR implicit $w0

...
---
name:            dont_combine_same_block
tracksRegLiveness: true
body:             |
  ; CHECK-LABEL: name: dont_combine_same_block
  ; CHECK: bb.0:
  ; CHECK:   successors: %bb.1(0x80000000)
  ; CHECK:   liveins: $w0, $w1
  ; CHECK:   %cond:_(s1) = G_IMPLICIT_DEF
  ; CHECK:   G_BRCOND %cond(s1), %bb.1
  ; CHECK:   G_BR %bb.1
  ; CHECK: bb.1:
  ; CHECK:   RET_ReallyLR
  bb.0:
    liveins: $w0, $w1
    %cond:_(s1) = G_IMPLICIT_DEF

    ; The G_BRCOND and G_BR have the same target here. Don't change anything.
    G_BRCOND %cond(s1), %bb.1
    G_BR %bb.1
  bb.1:
    RET_ReallyLR
...