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; RUN: opt < %s -S -debug-only=loop-unroll -loop-unroll 2>&1 | FileCheck %s
; REQUIRES: asserts
; Make sure we use the profile information correctly to peel-off 3 iterations
; from the loop, and update the branch weights for the peeled loop properly.
; CHECK: Loop Unroll: F[basic]
; CHECK: PEELING loop %for.body with iteration count 3!
; CHECK: Loop Unroll: F[optsize]
; CHECK-NOT: PEELING
; CHECK-LABEL: @basic
; CHECK: br i1 %{{.*}}, label %[[NEXT0:.*]], label %for.cond.for.end_crit_edge, !prof !1
; CHECK: [[NEXT0]]:
; CHECK: br i1 %{{.*}}, label %[[NEXT1:.*]], label %for.cond.for.end_crit_edge, !prof !2
; CHECK: [[NEXT1]]:
; CHECK: br i1 %{{.*}}, label %[[NEXT2:.*]], label %for.cond.for.end_crit_edge, !prof !3
; CHECK: [[NEXT2]]:
; CHECK: br i1 %{{.*}}, label %for.body, label %{{.*}}, !prof !4
define void @basic(i32* %p, i32 %k) #0 !prof !0 {
entry:
%cmp3 = icmp slt i32 0, %k
br i1 %cmp3, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.body
%i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
%incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
store i32 %i.05, i32* %p.addr.04, align 4
%inc = add nsw i32 %i.05, 1
%cmp = icmp slt i32 %inc, %k
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !1
for.cond.for.end_crit_edge: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void
}
; We don't want to peel loops when optimizing for size.
; CHECK-LABEL: @optsize
; CHECK: for.body.lr.ph:
; CHECK-NEXT: br label %for.body
; CHECK: for.body:
; CHECK-NOT: br
; CHECK: br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
define void @optsize(i32* %p, i32 %k) #1 !prof !0 {
entry:
%cmp3 = icmp slt i32 0, %k
br i1 %cmp3, label %for.body.lr.ph, label %for.end
for.body.lr.ph: ; preds = %entry
br label %for.body
for.body: ; preds = %for.body.lr.ph, %for.body
%i.05 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%p.addr.04 = phi i32* [ %p, %for.body.lr.ph ], [ %incdec.ptr, %for.body ]
%incdec.ptr = getelementptr inbounds i32, i32* %p.addr.04, i32 1
store i32 %i.05, i32* %p.addr.04, align 4
%inc = add nsw i32 %i.05, 1
%cmp = icmp slt i32 %inc, %k
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge, !prof !1
for.cond.for.end_crit_edge: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void
}
attributes #0 = { nounwind }
attributes #1 = { nounwind optsize }
!0 = !{!"function_entry_count", i64 1}
!1 = !{!"branch_weights", i32 3001, i32 1001}
;CHECK: !1 = !{!"branch_weights", i32 900, i32 101}
;CHECK: !2 = !{!"branch_weights", i32 540, i32 360}
;CHECK: !3 = !{!"branch_weights", i32 162, i32 378}
;CHECK: !4 = !{!"branch_weights", i32 1399, i32 162}
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