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blockfreq: Clean up irreducible testcases
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> llvm-svn: 207192
This commit is contained in:
Duncan P. N. Exon Smith
parent
20240d1036
commit
d2094f508a
@ -4,34 +4,25 @@
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;
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; CHECK-LABEL: Printing analysis {{.*}} for function 'multiexit':
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; CHECK-NEXT: block-frequency-info: multiexit
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define void @multiexit(i32 %a) {
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define void @multiexit(i1 %x) {
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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br label %loop.1
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; CHECK-NEXT: loop.1: float = 1.333{{3*}},
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loop.1:
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%i = phi i32 [ 0, %entry ], [ %inc.2, %loop.2 ]
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call void @f(i32 %i)
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%inc.1 = add i32 %i, 1
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%cmp.1 = icmp ugt i32 %inc.1, %a
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br i1 %cmp.1, label %exit.1, label %loop.2, !prof !0
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br i1 %x, label %exit.1, label %loop.2, !prof !0
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; CHECK-NEXT: loop.2: float = 0.666{{6*7}},
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loop.2:
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call void @g(i32 %inc.1)
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%inc.2 = add i32 %inc.1, 1
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%cmp.2 = icmp ugt i32 %inc.2, %a
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br i1 %cmp.2, label %exit.2, label %loop.1, !prof !1
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br i1 %x, label %exit.2, label %loop.1, !prof !1
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; CHECK-NEXT: exit.1: float = 0.666{{6*7}},
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exit.1:
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call void @h(i32 %inc.1)
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br label %return
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; CHECK-NEXT: exit.2: float = 0.333{{3*}},
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exit.2:
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call void @i(i32 %inc.2)
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br label %return
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; CHECK-NEXT: return: float = 1.0, int = [[ENTRY]]
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@ -39,11 +30,6 @@ return:
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ret void
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}
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declare void @f(i32 %x)
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declare void @g(i32 %x)
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declare void @h(i32 %x)
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declare void @i(i32 %x)
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!0 = metadata !{metadata !"branch_weights", i32 3, i32 3}
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!1 = metadata !{metadata !"branch_weights", i32 5, i32 5}
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@ -97,32 +83,22 @@ declare void @i(i32 %x)
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;
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; CHECK-LABEL: Printing analysis {{.*}} for function 'multientry':
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; CHECK-NEXT: block-frequency-info: multientry
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define void @multientry(i32 %a) {
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define void @multientry(i1 %x) {
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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%choose = call i32 @choose(i32 %a)
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%compare = icmp ugt i32 %choose, %a
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br i1 %compare, label %c1, label %c2, !prof !2
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br i1 %x, label %c1, label %c2, !prof !2
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; This is like a single-line XFAIL (see above).
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; CHECK-NEXT: c1:
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; CHECK-NOT: float = 2.142857{{[0-9]*}},
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c1:
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%i1 = phi i32 [ %a, %entry ], [ %i2.inc, %c2 ]
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%i1.inc = add i32 %i1, 1
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%choose1 = call i32 @choose(i32 %i1)
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%compare1 = icmp ugt i32 %choose1, %a
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br i1 %compare1, label %c2, label %exit, !prof !2
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br i1 %x, label %c2, label %exit, !prof !2
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; This is like a single-line XFAIL (see above).
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; CHECK-NEXT: c2:
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; CHECK-NOT: float = 1.857142{{[0-9]*}},
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c2:
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%i2 = phi i32 [ %a, %entry ], [ %i1.inc, %c1 ]
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%i2.inc = add i32 %i2, 1
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%choose2 = call i32 @choose(i32 %i2)
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%compare2 = icmp ugt i32 %choose2, %a
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br i1 %compare2, label %c1, label %exit, !prof !2
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br i1 %x, label %c1, label %exit, !prof !2
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; We still shouldn't lose any frequency.
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; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
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@ -158,32 +134,25 @@ exit:
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;
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; CHECK-LABEL: Printing analysis {{.*}} for function 'crossloops':
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; CHECK-NEXT: block-frequency-info: crossloops
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define void @crossloops(i32 %a) {
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define void @crossloops(i2 %x) {
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; CHECK-NEXT: entry: float = 1.0, int = [[ENTRY:[0-9]+]]
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entry:
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%choose = call i32 @choose(i32 %a)
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switch i32 %choose, label %exit [ i32 1, label %c1
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i32 2, label %c2 ], !prof !3
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switch i2 %x, label %exit [ i2 1, label %c1
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i2 2, label %c2 ], !prof !3
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; This is like a single-line XFAIL (see above).
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; CHECK-NEXT: c1:
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; CHECK-NOT: float = 1.0,
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c1:
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%i1 = phi i32 [ %a, %entry ], [ %i1.inc, %c1 ], [ %i2.inc, %c2 ]
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%i1.inc = add i32 %i1, 1
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%choose1 = call i32 @choose(i32 %i1)
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switch i32 %choose1, label %exit [ i32 1, label %c1
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i32 2, label %c2 ], !prof !3
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switch i2 %x, label %exit [ i2 1, label %c1
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i2 2, label %c2 ], !prof !3
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; This is like a single-line XFAIL (see above).
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; CHECK-NEXT: c2:
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; CHECK-NOT: float = 1.0,
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c2:
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%i2 = phi i32 [ %a, %entry ], [ %i1.inc, %c1 ], [ %i2.inc, %c2 ]
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%i2.inc = add i32 %i2, 1
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%choose2 = call i32 @choose(i32 %i2)
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switch i32 %choose2, label %exit [ i32 1, label %c1
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i32 2, label %c2 ], !prof !3
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switch i2 %x, label %exit [ i2 1, label %c1
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i2 2, label %c2 ], !prof !3
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; We still shouldn't lose any frequency.
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; CHECK-NEXT: exit: float = 1.0, int = [[ENTRY]]
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@ -191,8 +160,6 @@ exit:
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ret void
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}
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declare i32 @choose(i32)
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!2 = metadata !{metadata !"branch_weights", i32 3, i32 1}
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!3 = metadata !{metadata !"branch_weights", i32 2, i32 2, i32 2}
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