xref: /aosp_15_r20/external/llvm/test/CodeGen/AArch64/arm64-ands-bad-peephole.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; RUN: llc %s -o - -aarch64-atomic-cfg-tidy=0 | FileCheck %s
; Check that ANDS (tst) is not merged with ADD when the immediate
; is not 0.
; <rdar://problem/16693089>
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-ios"

; CHECK-LABEL: tst1:
; CHECK: add [[REG:w[0-9]+]], w{{[0-9]+}}, #1
; CHECK: tst [[REG]], #0x1
define void @tst1(i1 %tst, i32 %true) {
entry:
  br i1 %tst, label %for.end, label %for.body

for.body:                                         ; preds = %for.body, %entry
  %result.09 = phi i32 [ %add2.result.0, %for.body ], [ 1, %entry ]
  %i.08 = phi i32 [ %inc, %for.body ], [ 2, %entry ]
  %and = and i32 %i.08, 1
  %cmp1 = icmp eq i32 %and, 0
  %add2.result.0 = select i1 %cmp1, i32 %true, i32 %result.09
  %inc = add nsw i32 %i.08, 1
  %cmp = icmp slt i32 %i.08, %true
  br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge

for.cond.for.end_crit_edge:                       ; preds = %for.body
  %add2.result.0.lcssa = phi i32 [ %add2.result.0, %for.body ]
  br label %for.end

for.end:                                          ; preds = %for.cond.for.end_crit_edge, %entry
  ret void
}