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util: Init half-float tables on demand.

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Gets rid of unnecessary delays on startup and compiler-specific hax.
This commit is contained in:
Corbin Simpson
2010-04-01 14:41:18 -07:00
parent 7e1aceaf0a
commit 950300eb25
3 changed files with 14 additions and 57 deletions
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src/gallium/auxiliary/util/u_half.c
+8 -4
View File
@@ -50,7 +50,6 @@
*/
#include "util/u_half.h"
#include "util/u_init.h"
uint32_t util_half_to_float_mantissa_table[2048];
uint32_t util_half_to_float_exponent_table[64];
@@ -58,10 +57,15 @@ uint32_t util_half_to_float_offset_table[64];
uint16_t util_float_to_half_base_table[512];
uint8_t util_float_to_half_shift_table[512];
static void util_half_init_tables(void)
void util_half_init_tables(void)
{
static boolean inited = FALSE;
int i;
if (inited) {
return;
}
/* zero */
util_half_to_float_mantissa_table[0] = 0;
@@ -153,6 +157,6 @@ static void util_half_init_tables(void)
util_float_to_half_base_table[256 + i] = util_float_to_half_base_table[i] | 0x8000;
util_float_to_half_shift_table[256 + i] = util_float_to_half_shift_table[i];
}
}
UTIL_INIT(util_half_init_tables);
inited = TRUE;
}
src/gallium/auxiliary/util/u_half.h
+6 -1
View File
@@ -8,13 +8,14 @@
extern "C" {
#endif
extern uint32_t util_half_to_float_mantissa_table[2048];
extern uint32_t util_half_to_float_exponent_table[64];
extern uint32_t util_half_to_float_offset_table[64];
extern uint16_t util_float_to_half_base_table[512];
extern uint8_t util_float_to_half_shift_table[512];
void util_half_init_tables(void);
/*
* Note that if the half float is a signaling NaN, the x87 FPU will turn
* it into a quiet NaN immediately upon loading into a float.
@@ -30,6 +31,7 @@ static INLINE uint32_t
util_half_to_floatui(half h)
{
unsigned exp = h >> 10;
util_half_init_tables();
return util_half_to_float_mantissa_table[util_half_to_float_offset_table[exp] + (h & 0x3ff)]
+ util_half_to_float_exponent_table[exp];
}
@@ -38,6 +40,7 @@ static INLINE float
util_half_to_float(half h)
{
union fi r;
util_half_init_tables();
r.ui = util_half_to_floatui(h);
return r.f;
}
@@ -46,6 +49,7 @@ static INLINE half
util_floatui_to_half(uint32_t v)
{
unsigned signexp = v >> 23;
util_half_init_tables();
return util_float_to_half_base_table[signexp]
+ ((v & 0x007fffff) >> util_float_to_half_shift_table[signexp]);
}
@@ -54,6 +58,7 @@ static INLINE half
util_float_to_half(float f)
{
union fi i;
util_half_init_tables();
i.f = f;
return util_floatui_to_half(i.ui);
}
src/gallium/auxiliary/util/u_init.h
-52
View File
@@ -1,52 +0,0 @@
/*
* Copyright 2010 Luca Barbieri
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef U_INIT_H
#define U_INIT_H
/* Use UTIL_INIT(f) to have f called at program initialization.
Note that it is only guaranteed to be called if any symbol in the
.c file it is in sis referenced by the program.
UTIL_INIT functions are called in arbitrary order.
*/
#ifdef __cplusplus
/* use a C++ global constructor */
#define UTIL_INIT(f) struct f##__gctor_t {f##__gctor_t() {x();}} f##__gctor;
#elif defined(_MSC_VER)
/* add a pointer to the section where MSVC stores global constructor pointers */
/* see http://blogs.msdn.com/vcblog/archive/2006/10/20/crt-initialization.aspx and
http://stackoverflow.com/questions/1113409/attribute-constructor-equivalent-in-vc */
#pragma data_seg(".CRT$XCU")
#define UTIL_INIT(f) static void __cdecl f##__init(void) {f();}; __declspec(allocate(".CRT$XCU")) void (__cdecl* f##__xcu)(void) = f##__init;
#elif defined(__GNUC__)
#define UTIL_INIT(f) static void f##__init(void) __attribute__((constructor)); static void f##__init(void) {f();}
#else
#error Unsupported compiler: please find out how to implement global initializers in C on it
#endif
#endif