1
我有（人類可讀的）LLVM位碼文件Input.ll內部SyS_sendto的以下函數定義：LLVM選擇-always內聯通不內聯
; Function Attrs: alwaysinline noredzone nounwind
define i64 @SyS_sendto(
i64 %fd, i64 %buff, i64 %len, i64 %flags, i64 %addr, i64 %addr_len) #0 {
在這個文件的結尾，屬性＃0 包含單詞alwaysinline：
attributes #0 = { alwaysinline noredzone nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
某處Input.ll存在於SyS_sendto一個呼叫應在選擇傳球被內聯 -always內聯：
; Function Attrs: noredzone nounwind
define i64 @GO(i64 %fd, i64 %buff, i64 %len, i64 %flags) #0 {
%1 = trunc i64 %fd to i32
%2 = inttoptr i64 %buff to i8*
%3 = trunc i64 %flags to i32
%4 = tail call i64 bitcast
(i64 (i64, i64, i64, i64, i64, i64)*
@SyS_sendto to i64
(i32, i8*, i64, i32, %struct.sockaddr*, i32)*)
(i32 %1,
i8* %2,
i64 %len,
i32 %3,
%struct.sockaddr* null,
i32 0) #0
ret i64 %4
}
我運行：
llvm-as -o=Input.bc Input.ll
opt -always-inline Input.bc -o InlinedInput.bc
llvm-dis -o=InlinedInput.ll InlinedInput.bc
但是GO具有不改變，我看到InputInlined.ll調用SyS_sendto太...這是不內聯：
; Function Attrs: noredzone nounwind
define i64 @GO(i64 %fd, i64 %buff, i64 %len, i64 %flags) #0 {
%1 = trunc i64 %fd to i32
%2 = inttoptr i64 %buff to i8*
%3 = trunc i64 %flags to i32
%4 = tail call i64 bitcast
(i64 (i64, i64, i64, i64, i64, i64)*
@SyS_sendto to i64
(i32, i8*, i64, i32, %struct.sockaddr*, i32)*)
(i32 %1,
i8* %2,
i64 %len,
i32 %3,
%struct.sockaddr* null,
i32 0) #0
ret i64 %4
}
任何幫助非常感謝！謝謝！