; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
declare void @bar() cold
; Both 'l1' and 'r1' has one edge leading to 'cold' and another one to
; 'unreachable' blocks. Check that 'cold' paths are preferred. Also ensure both
; paths from 'entry' block are equal.
define void @test1(i32 %0) {
;CHECK: edge %entry -> %l1 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %entry -> %r1 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %l1 -> %cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %l1 -> %unreached probability is 0x00000000 / 0x80000000 = 0.00%
;CHECK: edge %r1 -> %unreached probability is 0x00000000 / 0x80000000 = 0.00%
;CHECK: edge %r1 -> %cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
entry:
br i1 undef, label %l1, label %r1
l1:
br i1 undef, label %cold, label %unreached
r1:
br i1 undef, label %unreached, label %cold
unreached:
unreachable
cold:
call void @bar()
ret void
}
; Both edges of 'l1' leads to 'cold' blocks while one edge of 'r1' leads to
; 'unreachable' block. Check that 'l1' has 50/50 while 'r1' has 0/100
; distributuion. Also ensure both paths from 'entry' block are equal.
define void @test2(i32 %0) {
;CHECK: edge %entry -> %l1 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %entry -> %r1 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %l1 -> %cold probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %l1 -> %cold2 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %r1 -> %unreached probability is 0x00000000 / 0x80000000 = 0.00%
;CHECK: edge %r1 -> %cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
entry:
br i1 undef, label %l1, label %r1
l1:
br i1 undef, label %cold, label %cold2
r1:
br i1 undef, label %unreached, label %cold
unreached:
unreachable
cold:
call void @bar()
ret void
cold2:
call void @bar()
ret void
}
; Both edges of 'r1' leads to 'unreachable' blocks while one edge of 'l1' leads to
; 'cold' block. Ensure that path leading to 'cold' block is preferred.
define void @test3(i32 %0) {
;CHECK: edge %entry -> %l1 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %entry -> %r1 probability is 0x00000000 / 0x80000000 = 0.00%
;CHECK: edge %l1 -> %cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %l1 -> %unreached probability is 0x00000000 / 0x80000000 = 0.00%
;CHECK: edge %r1 -> %unreached probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %r1 -> %unreached2 probability is 0x40000000 / 0x80000000 = 50.00%
entry:
br i1 undef, label %l1, label %r1
l1:
br i1 undef, label %cold, label %unreached
r1:
br i1 undef, label %unreached, label %unreached2
unreached:
unreachable
unreached2:
unreachable
cold:
call void @bar()
ret void
}
; Left edge of 'entry' leads to 'cold' block while right edge is 'normal' continuation.
; Check that we able to propagate 'cold' weight to 'entry' block. Also ensure
; both edges from 'l1' are equally likely.
define void @test4(i32 %0) {
;CHECK: edge %entry -> %l1 probability is 0x078780e3 / 0x80000000 = 5.88%
;CHECK: edge %entry -> %r1 probability is 0x78787f1d / 0x80000000 = 94.12% [HOT edge]
;CHECK: edge %l1 -> %l2 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %l1 -> %r2 probability is 0x40000000 / 0x80000000 = 50.00%
;CHECK: edge %l2 -> %to.cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %r2 -> %to.cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %to.cold -> %cold probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
entry:
br i1 undef, label %l1, label %r1
l1:
br i1 undef, label %l2, label %r2
l2:
br label %to.cold
r2:
br label %to.cold
to.cold:
br label %cold
r1:
ret void
cold:
call void @bar()
ret void
}
; Check that most likely path from 'entry' to 'l2' through 'r1' is preferred.
define void @test5(i32 %0) {
;CHECK: edge %entry -> %cold probability is 0x078780e3 / 0x80000000 = 5.88%
;CHECK: edge %entry -> %r1 probability is 0x78787f1d / 0x80000000 = 94.12% [HOT edge]
;CHECK: edge %cold -> %l2 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %r1 -> %l2 probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
;CHECK: edge %r1 -> %unreached probability is 0x00000000 / 0x80000000 = 0.00%
entry:
br i1 undef, label %cold, label %r1
cold:
call void @bar()
br label %l2
r1:
br i1 undef, label %l2, label %unreached
l2:
ret void
unreached:
unreachable
}
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