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[lib][libm] Add floorf and ceilf

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Needed by skia.

R=travisg@gmail.com

Review URL: https://codereview.chromium.org/1734733002 .
This commit is contained in:
cstout
2016-02-24 10:17:21 -08:00
parent c370f398c6
commit 5f050a570a
3 changed files with 115 additions and 0 deletions
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2
external/lib/libm/rules.mk vendored
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@@ -18,6 +18,7 @@ MODULE_SRCS += \
$(LOCAL_DIR)/e_sqrtf.c \
$(LOCAL_DIR)/k_rem_pio2.c \
$(LOCAL_DIR)/s_floor.c \
$(LOCAL_DIR)/s_floorf.c \
$(LOCAL_DIR)/s_scalbn.c \
$(LOCAL_DIR)/s_scalbnf.c \
$(LOCAL_DIR)/s_copysign.c \
@@ -35,6 +36,7 @@ MODULE_SRCS += \
$(LOCAL_DIR)/e_exp.c \
$(LOCAL_DIR)/s_round.c \
$(LOCAL_DIR)/s_ceil.c \
$(LOCAL_DIR)/s_ceilf.c \
$(LOCAL_DIR)/s_trunc.c \
$(LOCAL_DIR)/s_atan.c \
$(LOCAL_DIR)/e_atan2.c \

52
external/lib/libm/s_ceilf.c vendored Normal file
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@@ -0,0 +1,52 @@
/* s_ceilf.c -- float version of s_ceil.c.
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "math.h"
#include "math_private.h"
static const float huge = 1.0e30;
float
ceilf(float x)
{
int32_t i0,j0;
u_int32_t i;
GET_FLOAT_WORD(i0,x);
j0 = ((i0>>23)&0xff)-0x7f;
if(j0<23) {
if(j0<0) { /* raise inexact if x != 0 */
if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
if(i0<0) {i0=0x80000000;}
else if(i0!=0) { i0=0x3f800000;}
}
} else {
i = (0x007fffff)>>j0;
if((i0&i)==0) return x; /* x is integral */
if(huge+x>(float)0.0) { /* raise inexact flag */
if(i0>0) i0 += (0x00800000)>>j0;
i0 &= (~i);
}
}
} else {
if(j0==0x80) return x+x; /* inf or NaN */
else return x; /* x is integral */
}
SET_FLOAT_WORD(x,i0);
return x;
}

61
external/lib/libm/s_floorf.c vendored Normal file
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@@ -0,0 +1,61 @@
/* s_floorf.c -- float version of s_floor.c.
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* floorf(x)
* Return x rounded toward -inf to integral value
* Method:
* Bit twiddling.
* Exception:
* Inexact flag raised if x not equal to floorf(x).
*/
#include "math.h"
#include "math_private.h"
static const float huge = 1.0e30;
float
floorf(float x)
{
int32_t i0,j0;
u_int32_t i;
GET_FLOAT_WORD(i0,x);
j0 = ((i0>>23)&0xff)-0x7f;
if(j0<23) {
if(j0<0) { /* raise inexact if x != 0 */
if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
if(i0>=0) {i0=0;}
else if((i0&0x7fffffff)!=0)
{ i0=0xbf800000;}
}
} else {
i = (0x007fffff)>>j0;
if((i0&i)==0) return x; /* x is integral */
if(huge+x>(float)0.0) { /* raise inexact flag */
if(i0<0) i0 += (0x00800000)>>j0;
i0 &= (~i);
}
}
} else {
if(j0==0x80) return x+x; /* inf or NaN */
else return x; /* x is integral */
}
SET_FLOAT_WORD(x,i0);
return x;
}