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amdgpu/math: Don't use llvm instrinsic for native_log 

AMDGPU targets don't have insturction for it,
so it'll be expanded to C * log2 anyway.

v2: use native_log2 instead of the more precise sw implementation
v3: move to amdgpu
v4: drop old AMD copyright

Reviewer: Aaron Watry
Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
llvm-svn: 316587
This commit is contained in:
Jan Vesely 2017-10-25 16:49:17 +00:00
parent 538612c885
commit 9fedbb9d8e
3 changed files with 9 additions and 0 deletions
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1
libclc/amdgpu/lib/SOURCES
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@ -1,2 +1,3 @@
math/native_log.cl
math/nextafter.cl
math/sqrt.cl

5
libclc/amdgpu/lib/math/native_log.cl Normal file
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@ -0,0 +1,5 @@
#include <clc/clc.h>
#define __CLC_BODY <native_log.inc>
#define __FLOAT_ONLY
#include <clc/math/gentype.inc>

3
libclc/amdgpu/lib/math/native_log.inc Normal file
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@ -0,0 +1,3 @@
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE native_log(__CLC_GENTYPE val) {
return native_log2(val) * (1.0f / M_LOG2E_F);
}