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[mono] Optimize mono_metadata_decode_row_col_raw #99939

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merged 7 commits into from
Mar 21, 2024
Merged

[mono] Optimize mono_metadata_decode_row_col_raw #99939

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1a6fef3
Optimize mono_metadata_decode_row_col_raw
kg Mar 18, 2024
4ea8b0e
Address PR feedback
kg Mar 19, 2024
629bc1b
Address PR feedback
kg Mar 19, 2024
294bc9c
Hoist load
kg Mar 20, 2024
461f295
Fix build break
kg Mar 20, 2024
059f294
Fix hot reload not updating column offsets
kg Mar 20, 2024
d3ef4c3
Add missing component api attribute
kg Mar 21, 2024
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8 changes: 8 additions & 0 deletions src/mono/mono/metadata/metadata-internals.h
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Original file line number Diff line number Diff line change
Expand Up @@ -217,6 +217,8 @@ typedef struct {
guint32 size;
} MonoStreamHeader;

#define MONO_TABLE_INFO_MAX_COLUMNS 9

struct _MonoTableInfo {
const char *base;
guint rows_ : 24; /* don't access directly, use table_info_get_rows */
Expand All @@ -234,6 +236,12 @@ struct _MonoTableInfo {
* we only need 4, but 8 is aligned no shift required.
*/
guint32 size_bitfield;

/*
* optimize out the loop in mono_metadata_decode_row_col_raw.
* 4 * 9 easily fits in a uint8
*/
guint8 column_offsets[MONO_TABLE_INFO_MAX_COLUMNS];
};

#define REFERENCE_MISSING ((gpointer) -1)
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25 changes: 16 additions & 9 deletions src/mono/mono/metadata/metadata.c
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Expand Up @@ -1003,6 +1003,18 @@ mono_metadata_table_bounds_check_slow (MonoImage *image, int table_index, int to
return mono_metadata_update_table_bounds_check (image, table_index, token_index);
}

static void
compute_column_offsets (guint32 bitfield, guint8 column_offsets[MONO_TABLE_INFO_MAX_COLUMNS])
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{
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int offset = 0, c = mono_metadata_table_count (bitfield);
memset(column_offsets, 0, MONO_TABLE_INFO_MAX_COLUMNS);
for (int i = 0; i < c; i++) {
int size = mono_metadata_table_size (bitfield, i);
column_offsets[i] = (guint8)offset;
offset += size;
}
}

/**
* mono_metadata_compute_table_bases:
* \param meta metadata context to compute table values
Expand All @@ -1022,6 +1034,7 @@ mono_metadata_compute_table_bases (MonoImage *meta)
continue;

table->row_size = mono_metadata_compute_size (meta, i, &table->size_bitfield);
compute_column_offsets (table->size_bitfield, table->column_offsets);
table->base = base;
base += table_info_get_rows (table) * table->row_size;
}
Expand Down Expand Up @@ -1470,18 +1483,12 @@ mono_metadata_decode_row_col_raw (const MonoTableInfo *t, int idx, guint col)
{
const char *data;
int n;

guint32 bitfield = t->size_bitfield;

g_assert (GINT_TO_UINT32(idx) < table_info_get_rows (t));
g_assert (col < mono_metadata_table_count (bitfield));
data = t->base + idx * t->row_size;

n = mono_metadata_table_size (bitfield, 0);
for (guint i = 0; i < col; ++i) {
data += n;
n = mono_metadata_table_size (bitfield, i + 1);
}
data = t->base + idx * t->row_size + t->column_offsets [col];
n = mono_metadata_table_size (bitfield, col);
switch (n) {
case 1:
return *data;
Expand Down Expand Up @@ -6009,7 +6016,7 @@ signature_equiv_vararg (MonoMethodSignature *sig1, MonoMethodSignature *sig2, in
if (sig1->hasthis != sig2->hasthis ||
sig1->sentinelpos != sig2->sentinelpos)
return FALSE;

int flag = MONO_TYPE_EQ_FLAGS_SIG_ONLY | (((equiv_flags & SIG_EQUIV_FLAG_IGNORE_CMODS) != 0) ? MONO_TYPE_EQ_FLAG_IGNORE_CMODS : 0);

for (i = 0; i < sig1->sentinelpos; i++) {
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