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math: Use precomputed constant for log2(10.0) 

exp10 CTS fails with or without this change

Reviewer: Jeroen Ketema
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 318063
This commit is contained in:
Jan Vesely 2017-11-13 18:28:45 +00:00
parent 0a7d0230fc
commit 79b7566210
3 changed files with 11 additions and 3 deletions
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8
libclc/generic/include/clc/float/definitions.h
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@ -31,6 +31,10 @@
#define M_SQRT2_F 0x1.6a09e6p+0f
#define M_SQRT1_2_F 0x1.6a09e6p-1f
#ifdef __CLC_INTERNAL
#define M_LOG210_F 0x1.a934f0p+1f
#endif
#ifdef cl_khr_fp64
#define HUGE_VAL __builtin_huge_val()
@ -59,6 +63,10 @@
#define M_SQRT2 0x1.6a09e667f3bcdp+0
#define M_SQRT1_2 0x1.6a09e667f3bcdp-1
#ifdef __CLC_INTERNAL
#define M_LOG210 0x1.a934f0979a371p+1
#endif
#endif
#ifdef cl_khr_fp16

4
libclc/generic/lib/math/exp10.inc
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@ -1,9 +1,9 @@
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE exp10(__CLC_GENTYPE val) {
// exp10(x) = exp2(x * log2(10))
#if __CLC_FPSIZE == 32
return exp2(val * log2(10.0f));
return exp2(val * M_LOG210_F);
#elif __CLC_FPSIZE == 64
return exp2(val * log2(10.0));
return exp2(val * M_LOG210);
#else
#error unknown _CLC_FPSIZE
#endif

2
libclc/generic/lib/math/native_exp10.inc
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@ -1,3 +1,3 @@
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE native_exp10(__CLC_GENTYPE val) {
return native_exp2(val * native_log2(10));
return native_exp2(val * M_LOG210_F);
}