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sleef: use our own replacement of rint. Based on code from Alberto Griggio, but further optimized for SSE

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This commit is contained in:
Ingo Weyrich
2020-01-01 14:52:15 +01:00
parent 399a0055c6
commit 6302084804
1 changed files with 14 additions and 5 deletions
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19
rtengine/sleef.h
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@@ -894,6 +894,15 @@ __inline double xlog1p(double a) {
#define R_LN2f 1.442695040888963407359924681001892137426645954152985934135449406931f #define R_LN2f 1.442695040888963407359924681001892137426645954152985934135449406931f
#ifdef __SSE2__
__inline int xrintf(float x) {
return _mm_cvt_ss2si(_mm_set_ss(x));
}
#else
__inline int xrintf(float x) {
return x + (x < 0 ? -0.5f : 0.5f);
}
#endif
__inline int32_t floatToRawIntBits(float d) { __inline int32_t floatToRawIntBits(float d) {
union { union {
float f; float f;
@@ -980,7 +989,7 @@ __inline float xsinf(float d) {
int q; int q;
float u, s; float u, s;
q = rint(d * rtengine::RT_1_PI_F); q = xrintf(d * rtengine::RT_1_PI_F);
d = mlaf(q, -PI4_Af*4, d); d = mlaf(q, -PI4_Af*4, d);
d = mlaf(q, -PI4_Bf*4, d); d = mlaf(q, -PI4_Bf*4, d);
@@ -1009,7 +1018,7 @@ __inline float xcosf(float d) {
int q; int q;
float u, s; float u, s;
q = 1 + 2*rint(d * rtengine::RT_1_PI_F - 0.5f); q = 1 + 2*xrintf(d * rtengine::RT_1_PI_F - 0.5f);
d = mlaf(q, -PI4_Af*2, d); d = mlaf(q, -PI4_Af*2, d);
d = mlaf(q, -PI4_Bf*2, d); d = mlaf(q, -PI4_Bf*2, d);
@@ -1041,7 +1050,7 @@ __inline float2 xsincosf(float d) {
float u, s, t; float u, s, t;
float2 r; float2 r;
q = rint(d * rtengine::RT_2_PI_F); q = xrintf(d * rtengine::RT_2_PI_F);
s = d; s = d;
@@ -1083,7 +1092,7 @@ __inline float xtanf(float d) {
int q; int q;
float u, s, x; float u, s, x;
q = rint(d * (float)(2 * rtengine::RT_1_PI)); q = xrintf(d * (float)(2 * rtengine::RT_1_PI));
x = d; x = d;
@@ -1233,7 +1242,7 @@ __inline float xlogf1(float d) { // does xlogf(vmaxf(d, 1.f)) but faster
__inline float xexpf(float d) { __inline float xexpf(float d) {
if(d<=-104.0f) return 0.0f; if(d<=-104.0f) return 0.0f;
int q = rint(d * R_LN2f); int q = xrintf(d * R_LN2f);
float s, u; float s, u;
s = mlaf(q, -L2Uf, d); s = mlaf(q, -L2Uf, d);