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[FunctionSpecialization][nfc] Add a test for zero function entry count #160156

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Sep 22, 2025
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[FunctionSpecialization][nfc] Add a test for zero function entry count #160156

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97 changes: 77 additions & 20 deletions llvm/test/Transforms/FunctionSpecialization/profile-counts.ll
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Original file line number Diff line number Diff line change
@@ -1,20 +1,40 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --version 6
; RUN: opt -passes="ipsccp<func-spec>" -force-specialization -S < %s | FileCheck %s
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"

@A = external dso_local constant i32, align 4
@B = external dso_local constant i32, align 4

; CHECK: define dso_local i32 @bar(i32 %x, i32 %y, ptr %z) !prof ![[BAR_PROF:[0-9]]] {
;.
; CHECK: @A = external dso_local constant i32, align 4
; CHECK: @B = external dso_local constant i32, align 4
;.
define dso_local i32 @bar(i32 %x, i32 %y, ptr %z) !prof !0 {
; CHECK-LABEL: define dso_local i32 @bar(
; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]], ptr [[Z:%.*]]) !prof [[PROF0:![0-9]+]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp ne i32 [[X]], 0
; CHECK-NEXT: br i1 [[TOBOOL]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]], !prof [[PROF1:![0-9]+]]
; CHECK: [[IF_THEN]]:
; CHECK-NEXT: [[CALL:%.*]] = call i32 @foo.specialized.1(i32 [[X]], ptr @A)
; CHECK-NEXT: [[CALL1:%.*]] = call i32 @foo.specialized.2(i32 [[Y]], ptr @B)
; CHECK-NEXT: [[CALL2:%.*]] = call i32 @foo.specialized.2(i32 [[Y]], ptr @B)
; CHECK-NEXT: [[ADD:%.*]] = add i32 [[CALL]], [[CALL1]]
; CHECK-NEXT: [[ADD1:%.*]] = add i32 [[ADD]], [[CALL2]]
; CHECK-NEXT: br label %[[RETURN:.*]]
; CHECK: [[IF_ELSE]]:
; CHECK-NEXT: [[CALL3:%.*]] = call i32 @foo.specialized.2(i32 [[Y]], ptr @B)
; CHECK-NEXT: br label %[[RETURN]]
; CHECK: [[RETURN]]:
; CHECK-NEXT: [[RETVAL_0:%.*]] = phi i32 [ [[ADD1]], %[[IF_THEN]] ], [ [[CALL3]], %[[IF_ELSE]] ]
; CHECK-NEXT: [[CALL4:%.*]] = call i32 @foo(i32 [[X]], ptr [[Z]])
; CHECK-NEXT: [[ADD2:%.*]] = add i32 [[RETVAL_0]], [[CALL4]]
; CHECK-NEXT: ret i32 [[ADD2]]
;
entry:
%tobool = icmp ne i32 %x, 0
; CHECK: br i1 %tobool, label %if.then, label %if.else, !prof ![[BRANCH_PROF:[0-9]]]
br i1 %tobool, label %if.then, label %if.else, !prof !1

; CHECK: if.then:
; CHECK: call i32 @foo.specialized.1(i32 %x, ptr @A)
; CHECK: call i32 @foo.specialized.2(i32 %y, ptr @B)
; CHECK: call i32 @foo.specialized.2(i32 %y, ptr @B)
if.then:
%call = call i32 @foo(i32 %x, ptr @A)
%call1 = call i32 @foo(i32 %y, ptr @B)
Expand All @@ -23,36 +43,73 @@ if.then:
%add1 = add i32 %add, %call2
br label %return

; CHECK: if.else:
; CHECK: call i32 @foo.specialized.2(i32 %y, ptr @B)
if.else:
%call3 = call i32 @foo(i32 %y, ptr @B)
br label %return

; CHECK: return:
; CHECK: call i32 @foo(i32 %x, ptr %z)
return:
%retval.0 = phi i32 [ %add1, %if.then ], [ %call3, %if.else ]
%call4 = call i32 @foo(i32 %x, ptr %z);
%add2 = add i32 %retval.0, %call4
ret i32 %add2
}

; CHECK: define internal i32 @foo(i32 %x, ptr %b) !prof ![[FOO_UNSPEC_PROF:[0-9]]]
; CHECK: define internal i32 @foo.specialized.1(i32 %x, ptr %b) !prof ![[FOO_SPEC_1_PROF:[0-9]]]
; CHECK: define internal i32 @foo.specialized.2(i32 %x, ptr %b) !prof ![[FOO_SPEC_2_PROF:[0-9]]]
define internal i32 @foo(i32 %x, ptr %b) !prof !2 {
define dso_local i32 @baz(i32 %x, i32 %y) !prof !2 {
; CHECK-LABEL: define dso_local i32 @baz(
; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) !prof [[PROF2:![0-9]+]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp ne i32 [[X]], 0
; CHECK-NEXT: br i1 [[TOBOOL]], label %[[IF_THEN:.*]], label %[[IF_ELSE:.*]]
; CHECK: [[IF_THEN]]:
; CHECK-NEXT: [[CALL:%.*]] = call i32 @foo.specialized.1(i32 [[X]], ptr @A)
; CHECK-NEXT: br label %[[RETURN:.*]]
; CHECK: [[IF_ELSE]]:
; CHECK-NEXT: [[CALL1:%.*]] = call i32 @foo.specialized.2(i32 [[Y]], ptr @B)
; CHECK-NEXT: br label %[[RETURN]]
; CHECK: [[RETURN]]:
; CHECK-NEXT: [[RETVAL_0:%.*]] = phi i32 [ [[CALL]], %[[IF_THEN]] ], [ [[CALL1]], %[[IF_ELSE]] ]
; CHECK-NEXT: ret i32 [[RETVAL_0]]
;
entry:
%tobool = icmp ne i32 %x, 0
br i1 %tobool, label %if.then, label %if.else

if.then:
%call = call i32 @foo(i32 %x, ptr @A)
br label %return

if.else:
%call1 = call i32 @foo(i32 %y, ptr @B)
br label %return

return:
%retval.0 = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
ret i32 %retval.0
}

define internal i32 @foo(i32 %x, ptr %b) !prof !3 {
; CHECK-LABEL: define internal i32 @foo(
; CHECK-SAME: i32 [[X:%.*]], ptr [[B:%.*]]) !prof [[PROF3:![0-9]+]] {
; CHECK-NEXT: [[ENTRY:.*:]]
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[B]], align 4
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[X]], [[TMP0]]
; CHECK-NEXT: ret i32 [[ADD]]
;
entry:
%0 = load i32, ptr %b, align 4
%add = add nsw i32 %x, %0
ret i32 %add
}

; CHECK: ![[BAR_PROF]] = !{!"function_entry_count", i64 1000}
; CHECK: ![[BRANCH_PROF]] = !{!"branch_weights", i32 1, i32 3}
; CHECK: ![[FOO_UNSPEC_PROF]] = !{!"function_entry_count", i64 500}
; CHECK: ![[FOO_SPEC_1_PROF]] = !{!"function_entry_count", i64 250}
; CHECK: ![[FOO_SPEC_2_PROF]] = !{!"function_entry_count", i64 1250}
!0 = !{!"function_entry_count", i64 1000}
!1 = !{!"branch_weights", i32 1, i32 3}
!2 = !{!"function_entry_count", i64 2000}
!2 = !{!"function_entry_count", i64 0}
!3 = !{!"function_entry_count", i64 2000}
;.
; CHECK: [[PROF0]] = !{!"function_entry_count", i64 1000}
; CHECK: [[PROF1]] = !{!"branch_weights", i32 1, i32 3}
; CHECK: [[PROF2]] = !{!"function_entry_count", i64 0}
; CHECK: [[PROF3]] = !{!"function_entry_count", i64 500}
; CHECK: [[META4:![0-9]+]] = !{!"function_entry_count", i64 250}
; CHECK: [[META5:![0-9]+]] = !{!"function_entry_count", i64 1250}
;.