kfdtest: RoundToPowerOf2 function modified for compiler compliant bit shift values

Compiler behavior is undefined if the right operand is negative,
or greater than or equal to the width of the promoted left operand.
For release builds with address sanitizer enabled, this compiler
optimization behavior leads to unsupported queue size value since
current method shifts till 128 bits on a 64 bit value.

Signed-off-by: Sreekant Somasekharan <sreekant.somasekharan@amd.com>
Change-Id: Iafdc82d0dfb7f79e3012fb7bb70eda80e4b7a7a6

tests/kfdtest/src/KFDTestUtil.cpp

@@ -65,17 +65,18 @@ HSAKMT_STATUS fscanf_dec(const char *file, uint32_t *num)
 }
 
 uint64_t RoundToPowerOf2(uint64_t val) {
-  int bytes = sizeof(uint64_t);
+    val--;
 
-  val--;
+    /* Shift with amount larger than the bit width can result in
+     * undefined behavior by compiler for release builds.
+     * Shift till 32 bit only which is less than bit width of val.
+     */
+    for (int i = 1; i <= 32; i *= 2)
+        val |= val >> i;
 
-  for (int i = 0; i < bytes; i++) {
-    val |= val >> (1 << i);
-  }
+    val++;
 
-  val++;
-
-  return val;
+    return val;
 }
 
 bool WaitOnValue(const volatile unsigned int *buf, unsigned int value, unsigned int timeOut) {