forked from OSchip/llvm-project
79 lines
2.1 KiB
LLVM
79 lines
2.1 KiB
LLVM
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; RUN: opt < %s -passes='require<profile-summary>,cgscc(inline)' -S -inline-threshold=50 | FileCheck %s
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; This tests that the function count of a function gets properly scaled after
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; inlining a call chain leading to the function.
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; Function a calls c with count 200 (C1)
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; Function c calls e with count 250 (C2)
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; Entry count of e is 500 (C3)
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; Entry count of c is 500 (C4)
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; Function b calls c with count 300 (C5)
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; c->e inlining does not happen since the cost exceeds threshold.
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; c then inlined into a.
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; e now gets inlined into a (through c) since the branch condition in e is now
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; known and hence the cost gets reduced.
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; Estimated count of a->e callsite = C2 * (C1 / C4)
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; Estimated count of a->e callsite = 250 * (200 / 500) = 100
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; Remaining count of e = C3 - 100 = 500 - 100 = 400
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; Remaining count of c = C4 - C1 - C5 = 500 - 200 - 300 = 0
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@data = external global i32
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define i32 @a(i32 %a1) !prof !1 {
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%a2 = call i32 @c(i32 %a1, i32 1)
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ret i32 %a2
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}
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define i32 @b(i32 %b1) !prof !2 {
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%b2 = call i32 @c(i32 %b1, i32 %b1)
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ret i32 %b2
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}
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declare void @ext();
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; CHECK: @c(i32 %c1, i32 %c100) !prof [[COUNT1:![0-9]+]]
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define i32 @c(i32 %c1, i32 %c100) !prof !3 {
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call void @ext()
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%cond = icmp sle i32 %c1, 1
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br i1 %cond, label %cond_true, label %cond_false
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cond_false:
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ret i32 0
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cond_true:
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%c11 = call i32 @e(i32 %c100)
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ret i32 %c11
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}
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; CHECK: @e(i32 %c1) !prof [[COUNT2:![0-9]+]]
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define i32 @e(i32 %c1) !prof !4 {
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%cond = icmp sle i32 %c1, 1
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br i1 %cond, label %cond_true, label %cond_false
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cond_false:
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call void @ext()
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%c2 = load i32, i32* @data, align 4
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%c3 = add i32 %c1, %c2
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%c4 = mul i32 %c3, %c2
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%c5 = add i32 %c4, %c2
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%c6 = mul i32 %c5, %c2
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%c7 = add i32 %c6, %c2
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%c8 = mul i32 %c7, %c2
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%c9 = add i32 %c8, %c2
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%c10 = mul i32 %c9, %c2
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ret i32 %c10
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cond_true:
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ret i32 0
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}
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!llvm.module.flags = !{!0}
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; CHECK: [[COUNT1]] = !{!"function_entry_count", i64 0}
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; CHECK: [[COUNT2]] = !{!"function_entry_count", i64 400}
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!0 = !{i32 1, !"MaxFunctionCount", i32 5000}
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!1 = !{!"function_entry_count", i64 200}
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!2 = !{!"function_entry_count", i64 300}
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!3 = !{!"function_entry_count", i64 500}
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!4 = !{!"function_entry_count", i64 500}
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