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Side by Side Diff: fusl/src/math/__expo2f.c

Issue 1714623002: [fusl] clang-format fusl (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: headers too Created 4 years, 10 months ago
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1 #include "libm.h" 1 #include "libm.h"
2 2
3 /* k is such that k*ln2 has minimal relative error and x - kln2 > log(FLT_MIN) * / 3 /* k is such that k*ln2 has minimal relative error and x - kln2 > log(FLT_MIN)
4 */
4 static const int k = 235; 5 static const int k = 235;
5 static const float kln2 = 0x1.45c778p+7f; 6 static const float kln2 = 0x1.45c778p+7f;
6 7
7 /* expf(x)/2 for x >= log(FLT_MAX), slightly better than 0.5f*expf(x/2)*expf(x/2 ) */ 8 /* expf(x)/2 for x >= log(FLT_MAX), slightly better than
8 float __expo2f(float x) 9 * 0.5f*expf(x/2)*expf(x/2) */
9 { 10 float __expo2f(float x) {
10 » float scale; 11 float scale;
11 12
12 » /* note that k is odd and scale*scale overflows */ 13 /* note that k is odd and scale*scale overflows */
13 » SET_FLOAT_WORD(scale, (uint32_t)(0x7f + k/2) << 23); 14 SET_FLOAT_WORD(scale, (uint32_t)(0x7f + k / 2) << 23);
14 » /* exp(x - k ln2) * 2**(k-1) */ 15 /* exp(x - k ln2) * 2**(k-1) */
15 » return expf(x - kln2) * scale * scale; 16 return expf(x - kln2) * scale * scale;
16 } 17 }
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