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put in arena-put-back optimization

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This commit is contained in:
Allen Webster
2021-08-13 11:34:18 -07:00
parent 70e6daf2dd
commit 52d717c2b9
1 changed files with 6 additions and 4 deletions
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source/md.c
+6 -4
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@@ -1139,8 +1139,6 @@ MD_Utf16FromCodepoint(MD_u16 *out, MD_u32 codepoint)
return(advance);
}
// TODO(allen): arena "put back" operation to optimize these a bit more
MD_FUNCTION MD_String8
MD_S8FromS16(MD_Arena *arena, MD_String16 in)
{
@@ -1157,6 +1155,7 @@ MD_S8FromS16(MD_Arena *arena, MD_String16 in)
size += MD_Utf8FromCodepoint(str + size, consume.codepoint);
}
str[size] = 0;
MD_ArenaPutBack(arena, cap - size); // := ((cap + 1) - (size + 1))
return(MD_S8(str, size));
}
@@ -1164,7 +1163,7 @@ MD_FUNCTION MD_String16
MD_S16FromS8(MD_Arena *arena, MD_String8 in)
{
MD_u64 cap = in.size*2;
MD_u16 *str = MD_PushArray(arena, MD_u16, (cap + 1));
MD_u16 *str = MD_PushArray(arena, MD_u16, cap + 1);
MD_u8 *ptr = in.str;
MD_u8 *opl = ptr + in.size;
MD_u64 size = 0;
@@ -1176,6 +1175,7 @@ MD_S16FromS8(MD_Arena *arena, MD_String8 in)
size += MD_Utf16FromCodepoint(str + size, consume.codepoint);
}
str[size] = 0;
MD_ArenaPutBack(arena, 2*(cap - size)); // := 2*((cap + 1) - (size + 1))
MD_String16 result = {str, size};
return(result);
}
@@ -1194,6 +1194,7 @@ MD_S8FromS32(MD_Arena *arena, MD_String32 in)
size += MD_Utf8FromCodepoint(str + size, *ptr);
}
str[size] = 0;
MD_ArenaPutBack(arena, cap - size); // := ((cap + 1) - (size + 1))
return(MD_S8(str, size));
}
@@ -1201,7 +1202,7 @@ MD_FUNCTION MD_String32
MD_S32FromS8(MD_Arena *arena, MD_String8 in)
{
MD_u64 cap = in.size;
MD_u32 *str = MD_PushArray(arena, MD_u32, (cap + 1));
MD_u32 *str = MD_PushArray(arena, MD_u32, cap + 1);
MD_u8 *ptr = in.str;
MD_u8 *opl = ptr + in.size;
MD_u64 size = 0;
@@ -1214,6 +1215,7 @@ MD_S32FromS8(MD_Arena *arena, MD_String8 in)
size += 1;
}
str[size] = 0;
MD_ArenaPutBack(arena, 4*(cap - size)); // := 4*((cap + 1) - (size + 1))
MD_String32 result = {str, size};
return(result);
}