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blockfreq: Clean up irreducible testcases

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Strip irreducible testcases to pure control flow.  The function calls
made the branch weights more believable but cluttered it up a lot.
There isn't going to be any constant analysis here, so just use dumb
branch logic to clarify the important parts.

<rdar://problem/14292693>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207192 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith 2014-04-25 04:38:35 +00:00
parent 16df231a82
commit e838db3104
1 changed files with 14 additions and 47 deletions
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61
test/Analysis/BlockFrequencyInfo/irreducible.ll
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@ -4,34 +4,25 @@
;
; CHECK-LABEL: Printing analysis {{.*}} for function 'multiexit':
; CHECK-NEXT: block-frequency-info: multiexit
define void @multiexit(i32 %a) {
define void @multiexit(i1 %x) {
; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
entry:
br label %loop.1
; CHECK-NEXT: loop.1: float = 1.333{{3*}},
loop.1:
%i = phi i32 [ 0, %entry ], [ %inc.2, %loop.2 ]
call void @f(i32 %i)
%inc.1 = add i32 %i, 1
%cmp.1 = icmp ugt i32 %inc.1, %a
br i1 %cmp.1, label %exit.1, label %loop.2, !prof !0
br i1 %x, label %exit.1, label %loop.2, !prof !0
; CHECK-NEXT: loop.2: float = 0.666{{6*7}},
loop.2:
call void @g(i32 %inc.1)
%inc.2 = add i32 %inc.1, 1
%cmp.2 = icmp ugt i32 %inc.2, %a
br i1 %cmp.2, label %exit.2, label %loop.1, !prof !1
br i1 %x, label %exit.2, label %loop.1, !prof !1
; CHECK-NEXT: exit.1: float = 0.666{{6*7}},
exit.1:
call void @h(i32 %inc.1)
br label %return
; CHECK-NEXT: exit.2: float = 0.333{{3*}},
exit.2:
call void @i(i32 %inc.2)
br label %return
; CHECK-NEXT: return: float = 1.0, int = [[ENTRY]]
@ -39,11 +30,6 @@ return:
ret void
}
declare void @f(i32 %x)
declare void @g(i32 %x)
declare void @h(i32 %x)
declare void @i(i32 %x)
!0 = metadata !{metadata !"branch_weights", i32 3, i32 3}
!1 = metadata !{metadata !"branch_weights", i32 5, i32 5}
@ -97,32 +83,22 @@ declare void @i(i32 %x)
;
; CHECK-LABEL: Printing analysis {{.*}} for function 'multientry':
; CHECK-NEXT: block-frequency-info: multientry
define void @multientry(i32 %a) {
define void @multientry(i1 %x) {
; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
entry:
%choose = call i32 @choose(i32 %a)
%compare = icmp ugt i32 %choose, %a
br i1 %compare, label %c1, label %c2, !prof !2
br i1 %x, label %c1, label %c2, !prof !2
; This is like a single-line XFAIL (see above).
; CHECK-NEXT: c1:
; CHECK-NOT: float = 2.142857{{[0-9]*}},
c1:
%i1 = phi i32 [ %a, %entry ], [ %i2.inc, %c2 ]
%i1.inc = add i32 %i1, 1
%choose1 = call i32 @choose(i32 %i1)
%compare1 = icmp ugt i32 %choose1, %a
br i1 %compare1, label %c2, label %exit, !prof !2
br i1 %x, label %c2, label %exit, !prof !2
; This is like a single-line XFAIL (see above).
; CHECK-NEXT: c2:
; CHECK-NOT: float = 1.857142{{[0-9]*}},
c2:
%i2 = phi i32 [ %a, %entry ], [ %i1.inc, %c1 ]
%i2.inc = add i32 %i2, 1
%choose2 = call i32 @choose(i32 %i2)
%compare2 = icmp ugt i32 %choose2, %a
br i1 %compare2, label %c1, label %exit, !prof !2
br i1 %x, label %c1, label %exit, !prof !2
; We still shouldn't lose any frequency.
; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
@ -158,32 +134,25 @@ exit:
;
; CHECK-LABEL: Printing analysis {{.*}} for function 'crossloops':
; CHECK-NEXT: block-frequency-info: crossloops
define void @crossloops(i32 %a) {
define void @crossloops(i2 %x) {
; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
entry:
%choose = call i32 @choose(i32 %a)
switch i32 %choose, label %exit [ i32 1, label %c1
i32 2, label %c2 ], !prof !3
switch i2 %x, label %exit [ i2 1, label %c1
i2 2, label %c2 ], !prof !3
; This is like a single-line XFAIL (see above).
; CHECK-NEXT: c1:
; CHECK-NOT: float = 1.0,
c1:
%i1 = phi i32 [ %a, %entry ], [ %i1.inc, %c1 ], [ %i2.inc, %c2 ]
%i1.inc = add i32 %i1, 1
%choose1 = call i32 @choose(i32 %i1)
switch i32 %choose1, label %exit [ i32 1, label %c1
i32 2, label %c2 ], !prof !3
switch i2 %x, label %exit [ i2 1, label %c1
i2 2, label %c2 ], !prof !3
; This is like a single-line XFAIL (see above).
; CHECK-NEXT: c2:
; CHECK-NOT: float = 1.0,
c2:
%i2 = phi i32 [ %a, %entry ], [ %i1.inc, %c1 ], [ %i2.inc, %c2 ]
%i2.inc = add i32 %i2, 1
%choose2 = call i32 @choose(i32 %i2)
switch i32 %choose2, label %exit [ i32 1, label %c1
i32 2, label %c2 ], !prof !3
switch i2 %x, label %exit [ i2 1, label %c1
i2 2, label %c2 ], !prof !3
; We still shouldn't lose any frequency.
; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
@ -191,8 +160,6 @@ exit:
ret void
}
declare i32 @choose(i32)
!2 = metadata !{metadata !"branch_weights", i32 3, i32 1}
!3 = metadata !{metadata !"branch_weights", i32 2, i32 2, i32 2}