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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/114215] GCC makes wrong decision for inline with -Os or -Oz
 to deal with trivial functions
Date: Sun, 03 Mar 2024 03:27:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114215

--- Comment #3 from cqwrteur <unlvsur at live dot com> ---
test_demovector(checkedvector&):
        pushq   %rbx
        movq    %rdi, %rbx
        pushq   $4
        popq    %rsi
        call    checkedvector::operator[](unsigned long)
        movq    %rbx, %rdi
        movq    $5, (%rax)
        pushq   $6
        popq    %rsi
        call    checkedvector::operator[](unsigned long)
        movq    %rbx, %rdi
        movq    $5, (%rax)
        pushq   $10
        popq    %rsi
        call    checkedvector::operator[](unsigned long)
        movq    %rbx, %rdi
        movq    $5, (%rax)
        pushq   $5
        popq    %rsi
        call    checkedvector::operator[](unsigned long)
        movq    $5, (%rax)
        popq    %rbx
        ret
test_demovector_forceinline(checkedvector&):
        movq    (%rdi), %rax
        movq    8(%rdi), %rdx
        subq    %rax, %rdx
        cmpq    $32, %rdx
        ja      .L7
.L8:
        ud2
.L7:
        movq    $5, 32(%rax)
        cmpq    $48, %rdx
        jbe     .L8
        movq    $5, 48(%rax)
        cmpq    $80, %rdx
        jbe     .L8
        movq    $5, 80(%rax)
        movq    $5, 40(%rax)
        ret

see? first one has more instructions than the 2nd one.=