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-rw-r--r--src/inc/bitposition.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/inc/bitposition.h b/src/inc/bitposition.h
index 0f3831fce9..392d9a6632 100644
--- a/src/inc/bitposition.h
+++ b/src/inc/bitposition.h
@@ -25,7 +25,11 @@ inline
unsigned BitPosition(unsigned value)
{
_ASSERTE((value != 0) && ((value & (value-1)) == 0));
-#ifndef _TARGET_AMD64_
+#if defined(_TARGET_ARM_) && defined(__llvm__)
+ // use intrinsic functions for arm32
+ // this is applied for LLVM only but it may work for some compilers
+ DWORD index = __builtin_clz(__builtin_arm_rbit(value));
+#elif !defined(_TARGET_AMD64_)
const unsigned PRIME = 37;
static const char hashTable[PRIME] =