write_image_data-before.s

NEVER_INLINE static ErrorOr<void> write_image_data(LittleEndianOutputBitStream& bit_stream, Bitmap const& bitmap, bool all_pixels_are_opaque)
{
    for (ARGB32 pixel : bitmap) {
        u8 a = pixel >> 24;
        u8 r = pixel >> 16;
        u8 g = pixel >> 8;
        u8 b = pixel;

        // We wrote a huffman table that gives every symbol 8 bits. That means we can write the image data
        // out uncompressed –- but we do need to reverse the bit order of the bytes.
        TRY(bit_stream.write_bits(Compress::reverse8_lookup_table[g], 8u));
        TRY(bit_stream.write_bits(Compress::reverse8_lookup_table[r], 8u));
        TRY(bit_stream.write_bits(Compress::reverse8_lookup_table[b], 8u));

        // If all pixels are opaque, we wrote a one-element huffman table for alpha, which needs 0 bits per element.
        if (!all_pixels_are_opaque)
            TRY(bit_stream.write_bits(Compress::reverse8_lookup_table[a], 8u));
    }
    return {};
}

=>

+0x00	sub                 sp, sp, #0x80
+0x04	stp                 x26, x25, [sp, #0x30]
+0x08	stp                 x24, x23, [sp, #0x40]
+0x0c	stp                 x22, x21, [sp, #0x50]
+0x10	stp                 x20, x19, [sp, #0x60]
+0x14	stp                 x29, x30, [sp, #0x70]
+0x18	add                 x29, sp, #0x70
+0x1c	mov                 x19, x8
+0x20	adrp                x8, 220                         ; 0xdc000
+0x24	ldr                 x8, [x8, #0x750]
+0x28	ldr                 x8, [x8]
+0x2c	str                 x8, [sp, #0x28]
+0x30	ldur                x8, [x1, #0x4]
+0x34	lsr                 x9, x8, #32
+0x38	ldr                 w10, [x1, #0xc]
+0x3c	mul                 w9, w10, w9
+0x40	cmp                 w9, #0x0
+0x44	b.le                "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x174"
+0x48	asr                 x8, x8, #32
+0x4c	ldr                 x9, [x1, #0x18]
+0x50	mul                 x22, x9, x8
+0x54	cbz                 x22, "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x128"
+0x58	mov                 x20, x2
+0x5c	mov                 x21, x0
+0x60	ldr                 x23, [x1, #0x10]
+0x64	adrp                x24, 67                         ; 0x43000
+0x68	add                 x24, x24, #0x9a7
+0x6c	b                   "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x7c"
+0x70	add                 x23, x23, #0x4
+0x74	subs                x22, x22, #0x4
+0x78	b.eq                "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x128"
+0x7c	ldr                 w25, [x23]
+0x80	ubfx                x8, x25, #8, #8
+0x84	ldrb                w1, [x24, x8]
+0x88	add                 x8, sp, #0x8
+0x8c	mov                 x0, x21
+0x90	mov                 w2, #0x8
+0x94	bl                  "AK::ErrorOr<void, AK::Error> AK::LittleEndianOutputBitStream::write_bits<unsigned char>(unsigned char, unsigned long)"
+0x98	ldrb                w8, [sp, #0x20]
+0x9c	cbnz                w8, "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x104"
+0xa0	ubfx                x8, x25, #16, #8
+0xa4	ldrb                w1, [x24, x8]
+0xa8	add                 x8, sp, #0x8
+0xac	mov                 x0, x21
+0xb0	mov                 w2, #0x8
+0xb4	bl                  "AK::ErrorOr<void, AK::Error> AK::LittleEndianOutputBitStream::write_bits<unsigned char>(unsigned char, unsigned long)"
+0xb8	ldrb                w8, [sp, #0x20]
+0xbc	cbnz                w8, "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x104"
+0xc0	and                 x8, x25, #0xff
+0xc4	ldrb                w1, [x24, x8]
+0xc8	add                 x8, sp, #0x8
+0xcc	mov                 x0, x21
+0xd0	mov                 w2, #0x8
+0xd4	bl                  "AK::ErrorOr<void, AK::Error> AK::LittleEndianOutputBitStream::write_bits<unsigned char>(unsigned char, unsigned long)"
+0xd8	ldrb                w8, [sp, #0x20]
+0xdc	cbnz                w8, "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x104"
+0xe0	tbnz                w20, #0x0, "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x70"
+0xe4	lsr                 x8, x25, #24
+0xe8	ldrb                w1, [x24, x8]
+0xec	add                 x8, sp, #0x8
+0xf0	mov                 x0, x21
+0xf4	mov                 w2, #0x8
+0xf8	bl                  "AK::ErrorOr<void, AK::Error> AK::LittleEndianOutputBitStream::write_bits<unsigned char>(unsigned char, unsigned long)"
+0xfc	ldrb                w8, [sp, #0x20]
+0x100	cbz                 w8, "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x70"
+0x104	cmp                 w8, #0x1
+0x108	b.ne                "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x168"
+0x10c	ldur                q0, [sp, #0x8]
+0x110	str                 q0, [x19]
+0x114	ldr                 x8, [sp, #0x18]
+0x118	str                 x8, [x19, #0x10]
+0x11c	mov                 w8, #0x1
+0x120	strb                w8, [x19, #0x18]
+0x124	b                   "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x134"
+0x128	stp                 xzr, xzr, [x19]
+0x12c	strb                wzr, [x19, #0x18]
+0x130	str                 xzr, [x19, #0x10]
+0x134	ldr                 x8, [sp, #0x28]
+0x138	adrp                x9, 220                         ; 0xdc000
+0x13c	ldr                 x9, [x9, #0x750]
+0x140	ldr                 x9, [x9]
+0x144	cmp                 x9, x8
+0x148	b.ne                "Gfx::write_image_data(AK::LittleEndianOutputBitStream&, Gfx::Bitmap const&, bool)+0x180"
+0x14c	ldp                 x29, x30, [sp, #0x70]
+0x150	ldp                 x20, x19, [sp, #0x60]
+0x154	ldp                 x22, x21, [sp, #0x50]
+0x158	ldp                 x24, x23, [sp, #0x40]
+0x15c	ldp                 x26, x25, [sp, #0x30]
+0x160	add                 sp, sp, #0x80
+0x164	ret
+0x168	adrp                x0, 192                         ; 0xc0000
+0x16c	add                 x0, x0, #0x69b
+0x170	bl                  "DYLD-STUB$$ak_verification_failed"
+0x174	adrp                x0, 193                         ; 0xc1000
+0x178	add                 x0, x0, #0x4b3
+0x17c	bl                  "DYLD-STUB$$ak_verification_failed"
+0x180	bl                  "DYLD-STUB$$__stack_chk_fail"