Add AccessMsrDb.s for MSFT tool chain. It uses raw data to represent instructions...

[mirror_edk2.git] / MdePkg / Library / BaseLib / GetPowerOfTwo32.c

diff --git a/MdePkg/Library/BaseLib/GetPowerOfTwo32.c b/MdePkg/Library/BaseLib/GetPowerOfTwo32.c
index dbf4ca65138cef6585e2c550afc359b0308e2098..3472b7b06ef1e2d982e81a340d6340bdd4237b73 100644 (file)
--- a/MdePkg/Library/BaseLib/GetPowerOfTwo32.c
+++ b/MdePkg/Library/BaseLib/GetPowerOfTwo32.c
@@ -12,11 +12,14 @@
 \r
 **/\r
 \r
+\r
+\r
+\r
 #include "BaseLibInternals.h"\r
 \r
 /**\r
   Returns the value of the highest bit set in a 32-bit value. Equivalent to\r
-  1 << HighBitSet32(x).\r
+  1 << log2(x).\r
 \r
   This function computes the value of the highest bit set in the 32-bit value\r
   specified by Operand. If Operand is zero, then zero is returned.\r
@@ -33,8 +36,9 @@ GetPowerOfTwo32 (
   IN      UINT32                    Operand\r
   )\r
 {\r
-  INTN                              BitPos;\r
-  \r
-  BitPos = HighBitSet32 (Operand);\r
-  return BitPos >= 0 ? 1ul << BitPos : 0;\r
+  if (0 == Operand) {\r
+    return 0;\r
+  }\r
+\r
+  return 1ul << HighBitSet32 (Operand);\r
 }\r