; Test the static branch probability heuristics for no-return functions.
; RUN: opt < %s -analyze -branch-prob | FileCheck %s
declare void @g1()
declare void @g2()
declare void @g3()
declare void @g4()
define void @test1(i32 %a, i32 %b) {
entry:
br label %do.body
; CHECK: edge entry -> do.body probability is 16 / 16 = 100%
do.body:
%i.0 = phi i32 [ 0, %entry ], [ %inc3, %do.end ]
call void @g1()
br label %do.body1
; CHECK: edge do.body -> do.body1 probability is 124 / 124 = 100%
do.body1:
%j.0 = phi i32 [ 0, %do.body ], [ %inc, %do.body1 ]
call void @g2()
%inc = add nsw i32 %j.0, 1
%cmp = icmp slt i32 %inc, %b
br i1 %cmp, label %do.body1, label %do.end
; CHECK: edge do.body1 -> do.body1 probability is 124 / 128
; CHECK: edge do.body1 -> do.end probability is 4 / 128
do.end:
call void @g3()
%inc3 = add nsw i32 %i.0, 1
%cmp4 = icmp slt i32 %inc3, %a
br i1 %cmp4, label %do.body, label %do.end5
; CHECK: edge do.end -> do.body probability is 124 / 128
; CHECK: edge do.end -> do.end5 probability is 4 / 128
do.end5:
call void @g4()
ret void
}
define void @test2(i32 %a, i32 %b) {
entry:
%cmp9 = icmp sgt i32 %a, 0
br i1 %cmp9, label %for.body.lr.ph, label %for.end6
; CHECK: edge entry -> for.body.lr.ph probability is 20 / 32
; CHECK: edge entry -> for.end6 probability is 12 / 32
for.body.lr.ph:
%cmp27 = icmp sgt i32 %b, 0
br label %for.body
; CHECK: edge for.body.lr.ph -> for.body probability is 16 / 16 = 100%
for.body:
%i.010 = phi i32 [ 0, %for.body.lr.ph ], [ %inc5, %for.end ]
call void @g1()
br i1 %cmp27, label %for.body3, label %for.end
; CHECK: edge for.body -> for.body3 probability is 62 / 124 = 50%
; CHECK: edge for.body -> for.end probability is 62 / 124 = 50%
for.body3:
%j.08 = phi i32 [ %inc, %for.body3 ], [ 0, %for.body ]
call void @g2()
%inc = add nsw i32 %j.08, 1
%exitcond = icmp eq i32 %inc, %b
br i1 %exitcond, label %for.end, label %for.body3
; CHECK: edge for.body3 -> for.end probability is 4 / 128
; CHECK: edge for.body3 -> for.body3 probability is 124 / 128
for.end:
call void @g3()
%inc5 = add nsw i32 %i.010, 1
%exitcond11 = icmp eq i32 %inc5, %a
br i1 %exitcond11, label %for.end6, label %for.body
; CHECK: edge for.end -> for.end6 probability is 4 / 128
; CHECK: edge for.end -> for.body probability is 124 / 128
for.end6:
call void @g4()
ret void
}
define void @test3(i32 %a, i32 %b, i32* %c) {
entry:
br label %do.body
; CHECK: edge entry -> do.body probability is 16 / 16 = 100%
do.body:
%i.0 = phi i32 [ 0, %entry ], [ %inc4, %if.end ]
call void @g1()
%0 = load i32* %c, align 4
%cmp = icmp slt i32 %0, 42
br i1 %cmp, label %do.body1, label %if.end
; CHECK: edge do.body -> do.body1 probability is 62 / 124 = 50%
; CHECK: edge do.body -> if.end probability is 62 / 124 = 50%
do.body1:
%j.0 = phi i32 [ %inc, %do.body1 ], [ 0, %do.body ]
call void @g2()
%inc = add nsw i32 %j.0, 1
%cmp2 = icmp slt i32 %inc, %b
br i1 %cmp2, label %do.body1, label %if.end
; CHECK: edge do.body1 -> do.body1 probability is 124 / 128
; CHECK: edge do.body1 -> if.end probability is 4 / 128
if.end:
call void @g3()
%inc4 = add nsw i32 %i.0, 1
%cmp5 = icmp slt i32 %inc4, %a
br i1 %cmp5, label %do.body, label %do.end6
; CHECK: edge if.end -> do.body probability is 124 / 128
; CHECK: edge if.end -> do.end6 probability is 4 / 128
do.end6:
call void @g4()
ret void
}
define void @test4(i32 %a, i32 %b, i32* %c) {
entry:
br label %do.body
; CHECK: edge entry -> do.body probability is 16 / 16 = 100%
do.body:
%i.0 = phi i32 [ 0, %entry ], [ %inc4, %do.end ]
call void @g1()
%0 = load i32* %c, align 4
%cmp = icmp slt i32 %0, 42
br i1 %cmp, label %return, label %do.body1
; CHECK: edge do.body -> return probability is 4 / 128
; CHECK: edge do.body -> do.body1 probability is 124 / 128
do.body1:
%j.0 = phi i32 [ %inc, %do.body1 ], [ 0, %do.body ]
call void @g2()
%inc = add nsw i32 %j.0, 1
%cmp2 = icmp slt i32 %inc, %b
br i1 %cmp2, label %do.body1, label %do.end
; CHECK: edge do.body1 -> do.body1 probability is 124 / 128
; CHECK: edge do.body1 -> do.end probability is 4 / 128
do.end:
call void @g3()
%inc4 = add nsw i32 %i.0, 1
%cmp5 = icmp slt i32 %inc4, %a
br i1 %cmp5, label %do.body, label %do.end6
; CHECK: edge do.end -> do.body probability is 124 / 128
; CHECK: edge do.end -> do.end6 probability is 4 / 128
do.end6:
call void @g4()
br label %return
; CHECK: edge do.end6 -> return probability is 16 / 16 = 100%
return:
ret void
}
define void @test5(i32 %a, i32 %b, i32* %c) {
entry:
br label %do.body
; CHECK: edge entry -> do.body probability is 16 / 16 = 100%
do.body:
%i.0 = phi i32 [ 0, %entry ], [ %inc4, %do.end ]
call void @g1()
br label %do.body1
; CHECK: edge do.body -> do.body1 probability is 124 / 124 = 100%
do.body1:
%j.0 = phi i32 [ 0, %do.body ], [ %inc, %if.end ]
%0 = load i32* %c, align 4
%cmp = icmp slt i32 %0, 42
br i1 %cmp, label %return, label %if.end
; CHECK: edge do.body1 -> return probability is 4 / 128
; CHECK: edge do.body1 -> if.end probability is 124 / 128
if.end:
call void @g2()
%inc = add nsw i32 %j.0, 1
%cmp2 = icmp slt i32 %inc, %b
br i1 %cmp2, label %do.body1, label %do.end
; CHECK: edge if.end -> do.body1 probability is 124 / 128
; CHECK: edge if.end -> do.end probability is 4 / 128
do.end:
call void @g3()
%inc4 = add nsw i32 %i.0, 1
%cmp5 = icmp slt i32 %inc4, %a
br i1 %cmp5, label %do.body, label %do.end6
; CHECK: edge do.end -> do.body probability is 124 / 128
; CHECK: edge do.end -> do.end6 probability is 4 / 128
do.end6:
call void @g4()
br label %return
; CHECK: edge do.end6 -> return probability is 16 / 16 = 100%
return:
ret void
}
define void @test6(i32 %a, i32 %b, i32* %c) {
entry:
br label %do.body
; CHECK: edge entry -> do.body probability is 16 / 16 = 100%
do.body:
%i.0 = phi i32 [ 0, %entry ], [ %inc4, %do.end ]
call void @g1()
br label %do.body1
; CHECK: edge do.body -> do.body1 probability is 124 / 124 = 100%
do.body1:
%j.0 = phi i32 [ 0, %do.body ], [ %inc, %do.cond ]
call void @g2()
%0 = load i32* %c, align 4
%cmp = icmp slt i32 %0, 42
br i1 %cmp, label %return, label %do.cond
; CHECK: edge do.body1 -> return probability is 4 / 128
; CHECK: edge do.body1 -> do.cond probability is 124 / 128
do.cond:
%inc = add nsw i32 %j.0, 1
%cmp2 = icmp slt i32 %inc, %b
br i1 %cmp2, label %do.body1, label %do.end
; CHECK: edge do.cond -> do.body1 probability is 124 / 128
; CHECK: edge do.cond -> do.end probability is 4 / 128
do.end:
call void @g3()
%inc4 = add nsw i32 %i.0, 1
%cmp5 = icmp slt i32 %inc4, %a
br i1 %cmp5, label %do.body, label %do.end6
; CHECK: edge do.end -> do.body probability is 124 / 128
; CHECK: edge do.end -> do.end6 probability is 4 / 128
do.end6:
call void @g4()
br label %return
; CHECK: edge do.end6 -> return probability is 16 / 16 = 100%
return:
ret void
}
define void @test7(i32 %a, i32 %b, i32* %c) {
entry:
%cmp10 = icmp sgt i32 %a, 0
br i1 %cmp10, label %for.body.lr.ph, label %for.end7
; CHECK: edge entry -> for.body.lr.ph probability is 20 / 32
; CHECK: edge entry -> for.end7 probability is 12 / 32
for.body.lr.ph:
%cmp38 = icmp sgt i32 %b, 0
br label %for.body
; CHECK: edge for.body.lr.ph -> for.body probability is 16 / 16 = 100%
for.body:
%i.011 = phi i32 [ 0, %for.body.lr.ph ], [ %inc6, %for.inc5 ]
%0 = load i32* %c, align 4
%cmp1 = icmp eq i32 %0, %i.011
br i1 %cmp1, label %for.inc5, label %if.end
; CHECK: edge for.body -> for.inc5 probability is 62 / 124 = 50%
; CHECK: edge for.body -> if.end probability is 62 / 124 = 50%
if.end:
call void @g1()
br i1 %cmp38, label %for.body4, label %for.end
; CHECK: edge if.end -> for.body4 probability is 62 / 124 = 50%
; CHECK: edge if.end -> for.end probability is 62 / 124 = 50%
for.body4:
%j.09 = phi i32 [ %inc, %for.body4 ], [ 0, %if.end ]
call void @g2()
%inc = add nsw i32 %j.09, 1
%exitcond = icmp eq i32 %inc, %b
br i1 %exitcond, label %for.end, label %for.body4
; CHECK: edge for.body4 -> for.end probability is 4 / 128
; CHECK: edge for.body4 -> for.body4 probability is 124 / 128
for.end:
call void @g3()
br label %for.inc5
; CHECK: edge for.end -> for.inc5 probability is 124 / 124 = 100%
for.inc5:
%inc6 = add nsw i32 %i.011, 1
%exitcond12 = icmp eq i32 %inc6, %a
br i1 %exitcond12, label %for.end7, label %for.body
; CHECK: edge for.inc5 -> for.end7 probability is 4 / 128
; CHECK: edge for.inc5 -> for.body probability is 124 / 128
for.end7:
call void @g4()
ret void
}
define void @test8(i32 %a, i32 %b, i32* %c) {
entry:
%cmp18 = icmp sgt i32 %a, 0
br i1 %cmp18, label %for.body.lr.ph, label %for.end15
; CHECK: edge entry -> for.body.lr.ph probability is 20 / 32
; CHECK: edge entry -> for.end15 probability is 12 / 32
for.body.lr.ph:
%cmp216 = icmp sgt i32 %b, 0
%arrayidx5 = getelementptr inbounds i32* %c, i64 1
%arrayidx9 = getelementptr inbounds i32* %c, i64 2
br label %for.body
; CHECK: edge for.body.lr.ph -> for.body probability is 16 / 16 = 100%
for.body:
%i.019 = phi i32 [ 0, %for.body.lr.ph ], [ %inc14, %for.end ]
call void @g1()
br i1 %cmp216, label %for.body3, label %for.end
; CHECK: edge for.body -> for.body3 probability is 62 / 124 = 50%
; CHECK: edge for.body -> for.end probability is 62 / 124 = 50%
for.body3:
%j.017 = phi i32 [ 0, %for.body ], [ %inc, %for.inc ]
%0 = load i32* %c, align 4
%cmp4 = icmp eq i32 %0, %j.017
br i1 %cmp4, label %for.inc, label %if.end
; CHECK: edge for.body3 -> for.inc probability is 62 / 124 = 50%
; CHECK: edge for.body3 -> if.end probability is 62 / 124 = 50%
if.end:
%1 = load i32* %arrayidx5, align 4
%cmp6 = icmp eq i32 %1, %j.017
br i1 %cmp6, label %for.inc, label %if.end8
; CHECK: edge if.end -> for.inc probability is 62 / 124 = 50%
; CHECK: edge if.end -> if.end8 probability is 62 / 124 = 50%
if.end8:
%2 = load i32* %arrayidx9, align 4
%cmp10 = icmp eq i32 %2, %j.017
br i1 %cmp10, label %for.inc, label %if.end12
; CHECK: edge if.end8 -> for.inc probability is 62 / 124 = 50%
; CHECK: edge if.end8 -> if.end12 probability is 62 / 124 = 50%
if.end12:
call void @g2()
br label %for.inc
; CHECK: edge if.end12 -> for.inc probability is 124 / 124 = 100%
for.inc:
%inc = add nsw i32 %j.017, 1
%exitcond = icmp eq i32 %inc, %b
br i1 %exitcond, label %for.end, label %for.body3
; CHECK: edge for.inc -> for.end probability is 4 / 128
; CHECK: edge for.inc -> for.body3 probability is 124 / 128
for.end:
call void @g3()
%inc14 = add nsw i32 %i.019, 1
%exitcond20 = icmp eq i32 %inc14, %a
br i1 %exitcond20, label %for.end15, label %for.body
; CHECK: edge for.end -> for.end15 probability is 4 / 128
; CHECK: edge for.end -> for.body probability is 124 / 128
for.end15:
call void @g4()
ret void
}