forked from OSchip/llvm-project
53 lines
1.5 KiB
LLVM
53 lines
1.5 KiB
LLVM
; RUN: opt < %s -analyze -block-freq | FileCheck %s
|
|
; RUN: opt < %s -passes='print<block-freq>' -disable-output 2>&1 | FileCheck %s
|
|
|
|
declare void @g(i32 %x)
|
|
|
|
; CHECK-LABEL: Printing analysis {{.*}} for function 'branch_weight_0':
|
|
; CHECK-NEXT: block-frequency-info: branch_weight_0
|
|
define void @branch_weight_0(i32 %a) {
|
|
; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
|
|
entry:
|
|
br label %for.body
|
|
|
|
; Check that we get 1 and a huge frequency instead of 0,3.
|
|
; CHECK-NEXT: for.body: float = 2147483647.8,
|
|
for.body:
|
|
%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
|
|
call void @g(i32 %i)
|
|
%inc = add i32 %i, 1
|
|
%cmp = icmp ugt i32 %inc, %a
|
|
br i1 %cmp, label %for.end, label %for.body, !prof !0
|
|
|
|
; CHECK-NEXT: for.end: float = 1.0, int = [[ENTRY]]
|
|
for.end:
|
|
ret void
|
|
}
|
|
|
|
!0 = !{!"branch_weights", i32 0, i32 3}
|
|
|
|
; CHECK-LABEL: Printing analysis {{.*}} for function 'infinite_loop'
|
|
; CHECK-NEXT: block-frequency-info: infinite_loop
|
|
define void @infinite_loop(i1 %x) {
|
|
; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
|
|
entry:
|
|
br i1 %x, label %for.body, label %for.end, !prof !1
|
|
|
|
; Check that the infinite loop is arbitrarily scaled to max out at 4096,
|
|
; giving 2048 here.
|
|
; CHECK-NEXT: for.body: float = 2048.0,
|
|
for.body:
|
|
%i = phi i32 [ 0, %entry ], [ %inc, %for.body ]
|
|
call void @g(i32 %i)
|
|
%inc = add i32 %i, 1
|
|
br label %for.body
|
|
|
|
; Check that the exit weight is half of entry, since half is lost in the
|
|
; infinite loop above.
|
|
; CHECK-NEXT: for.end: float = 0.5,
|
|
for.end:
|
|
ret void
|
|
}
|
|
|
|
!1 = !{!"branch_weights", i32 1, i32 1}
|