xref: /llvm-project-15.0.7/llvm/test/CodeGen/PowerPC/ppc-ctr-dead-code.ll (revision 0026c06e)

; RUN: llc < %s -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr9 -verify-machineinstrs | FileCheck %s
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr9 -verify-machineinstrs | FileCheck %s
; RUN: llc < %s -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr8 -verify-machineinstrs | FileCheck %s
; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr8 -verify-machineinstrs | FileCheck %s

; Function Attrs: norecurse nounwind readonly
define signext i32 @limit_loop(i32 signext %iters, i32* nocapture readonly %vec, i32 signext %limit) local_unnamed_addr {
entry:
  %cmp5 = icmp sgt i32 %iters, 0
  br i1 %cmp5, label %for.body.preheader, label %cleanup

for.body.preheader:                               ; preds = %entry
  %0 = sext i32 %iters to i64
  br label %for.body

for.cond:                                         ; preds = %for.body
  %cmp = icmp slt i64 %indvars.iv.next, %0
  br i1 %cmp, label %for.body, label %cleanup

for.body:                                         ; preds = %for.body.preheader, %for.cond
  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.cond ]
  %arrayidx = getelementptr inbounds i32, i32* %vec, i64 %indvars.iv
  %1 = load i32, i32* %arrayidx, align 4
  %cmp1 = icmp slt i32 %1, %limit
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br i1 %cmp1, label %for.cond, label %cleanup

cleanup:                                          ; preds = %for.body, %for.cond, %entry
  %2 = phi i32 [ 0, %entry ], [ 0, %for.cond ], [ 1, %for.body ]
  ret i32 %2
; CHECK-LABEL: limit_loop
; CHECK: mtctr
; CHECK-NOT: addi {{[0-9]+}}, {{[0-9]+}}, 1
; CHECK: bdnz
; CHECK: blr
}