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-rw-r--r--src/support/bits.cpp25
-rw-r--r--src/support/bits.h2
2 files changed, 27 insertions, 0 deletions
diff --git a/src/support/bits.cpp b/src/support/bits.cpp
index c1de4da8b..3d03b100c 100644
--- a/src/support/bits.cpp
+++ b/src/support/bits.cpp
@@ -15,6 +15,7 @@
*/
#define wasm_support_bits_definitions
+#include "../compiler-support.h"
#include "support/bits.h"
namespace wasm {
@@ -99,4 +100,28 @@ int CountLeadingZeroes<uint64_t>(uint64_t v) {
: 32 + CountLeadingZeroes((uint32_t)v);
}
+uint32_t Log2(uint32_t v) {
+ switch (v) {
+ default: WASM_UNREACHABLE();
+ case 1: return 0;
+ case 2: return 1;
+ case 4: return 2;
+ case 8: return 3;
+ case 16: return 4;
+ case 32: return 5;
+ }
+}
+
+uint32_t Pow2(uint32_t v) {
+ switch (v) {
+ default: WASM_UNREACHABLE();
+ case 0: return 1;
+ case 1: return 2;
+ case 2: return 4;
+ case 3: return 8;
+ case 4: return 16;
+ case 5: return 32;
+ }
+}
+
} // namespace wasm
diff --git a/src/support/bits.h b/src/support/bits.h
index 6c9fbad94..5d3502b81 100644
--- a/src/support/bits.h
+++ b/src/support/bits.h
@@ -79,6 +79,8 @@ inline static T RotateRight(T val, T count) {
return (val >> count) | (val << (-count & mask));
}
+extern uint32_t Log2(uint32_t v);
+extern uint32_t Pow2(uint32_t v);
} // namespace wasm