[libclc] 16/79: native_powr: Switch implementation to native_exp2 and native_log2

[Andreas Boll]

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commit 38cf24da571a2e372638e7ad3a2600f9161457f4
Author: Jan Vesely <jan.vesely at rutgers.edu>
Date:   Tue Nov 14 21:55:41 2017 +0000

    native_powr: Switch implementation to native_exp2 and native_log2
    
    v2: don't use assume
        check only for x<0, the other conditions are handled transparently
    v3: don't check inputs at all, nan propagation works as expected
    
    Reviewer: Jeroen Ketema
    Signed-off-by: Jan Vesely <jan.vesely at rutgers.edu>
    
    git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@318204 91177308-0d34-0410-b5e6-96231b3b80d8
---
 generic/include/clc/math/native_powr.h | 8 +++++++-
 generic/lib/SOURCES                    | 1 +
 generic/lib/math/native_powr.cl        | 5 +++++
 generic/lib/math/native_powr.inc       | 5 +++++
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/generic/include/clc/math/native_powr.h b/generic/include/clc/math/native_powr.h
index e8a37d9..c31161a 100644
--- a/generic/include/clc/math/native_powr.h
+++ b/generic/include/clc/math/native_powr.h
@@ -1 +1,7 @@
-#define native_powr pow
+#define __CLC_BODY <clc/math/binary_decl_tt.inc>
+#define __CLC_FUNCTION native_powr
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
diff --git a/generic/lib/SOURCES b/generic/lib/SOURCES
index 355741c..ad5a743 100644
--- a/generic/lib/SOURCES
+++ b/generic/lib/SOURCES
@@ -127,6 +127,7 @@ math/native_exp2.cl
 math/native_log.cl
 math/native_log10.cl
 math/native_log2.cl
+math/native_powr.cl
 math/native_recip.cl
 math/native_rsqrt.cl
 math/native_sin.cl
diff --git a/generic/lib/math/native_powr.cl b/generic/lib/math/native_powr.cl
new file mode 100644
index 0000000..452bc6f
--- /dev/null
+++ b/generic/lib/math/native_powr.cl
@@ -0,0 +1,5 @@
+#include <clc/clc.h>
+
+#define __CLC_BODY <native_powr.inc>
+#define __FLOAT_ONLY
+#include <clc/math/gentype.inc>
diff --git a/generic/lib/math/native_powr.inc b/generic/lib/math/native_powr.inc
new file mode 100644
index 0000000..f2c30a9
--- /dev/null
+++ b/generic/lib/math/native_powr.inc
@@ -0,0 +1,5 @@
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE native_powr(__CLC_GENTYPE x, __CLC_GENTYPE y) {
+  // x^y == 2^{log2 x^y} == 2^{y * log2 x}
+  // for x < 0 propagate nan created by log2
+  return native_exp2(y * native_log2(x));
+}

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