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mesa: Shrink the size of the enum string lookup struct.

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Since it's only used for debug information, we can misalign the struct and
save the disk space.  Another 19k on a 64-bit build.

v2: Make a compiler.h macro to only use the attribute if we know we can.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@.intel.com>
This commit is contained in:
Eric Anholt 2013-09-19 14:54:13 -07:00
parent c0378b6400
commit 673129e0b9
2 changed files with 13 additions and 2 deletions
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6
src/mapi/glapi/gen/gl_enums.py
View file

@ -47,8 +47,8 @@ class PrintGlEnums(gl_XML.gl_print_base):
print '#include "main/imports.h"'
print '#include "main/mtypes.h"'
print ''
print 'typedef struct {'
print ' size_t offset;'
print 'typedef struct PACKED {'
print ' uint16_t offset;'
print ' int n;'
print '} enum_elt;'
print ''
@ -78,6 +78,8 @@ static char token_tmp[20];
const char *_mesa_lookup_enum_by_nr( int nr )
{
STATIC_ASSERT(sizeof(enum_string_table) < (1 << 16));
enum_elt *elt = _mesa_bsearch(& nr, enum_string_table_offsets,
Elements(enum_string_table_offsets),
sizeof(enum_string_table_offsets[0]),

9
src/mesa/main/compiler.h
View file

@ -270,6 +270,15 @@ static INLINE GLuint CPU_TO_LE32(GLuint x)
#define NULL 0
#endif
/* Used to optionally mark structures with misaligned elements or size as
* packed, to trade off performance for space.
*/
#if (__GNUC__ >= 3)
#define PACKED __attribute__((__packed__))
#else
#define PACKED
#endif
/**
* LONGSTRING macro