[flang-commits] [flang] [flang] Add ETIME runtime and lowering intrinsics implementation (PR #90578)

[Tom Eccles via flang-commits]

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@@ -370,5 +374,69 @@ void RTNAME(DateAndTime)(char *date, std::size_t dateChars, char *time,
       terminator, date, dateChars, time, timeChars, zone, zoneChars, values);
 }
 
+void RTNAME(Etime)(const Descriptor *values, const Descriptor *time,
+    const char *sourceFile, int line) {
+  Fortran::runtime::Terminator terminator{sourceFile, line};
+
+  double usrTime = -1.0, sysTime = -1.0, realTime = -1.0;
+
+#ifdef _WIN32
+  FILETIME creationTime;
+  FILETIME exitTime;
+  FILETIME kernelTime;
+  FILETIME userTime;
+
+  if (GetProcessTimes(GetCurrentProcess(), &creationTime, &exitTime,
+          &kernelTime, &userTime) != -1) {
+    ULARGE_INTEGER userSystemTime;
+    ULARGE_INTEGER kernelSystemTime;
+
+    memcpy(&userSystemTime, &userTime, sizeof(FILETIME));
+    memcpy(&kernelSystemTime, &kernelTime, sizeof(FILETIME));
+
+    usrTime = double(userSystemTime.QuadPart / 10000);
+    sysTime = double(kernelSystemTime.QuadPart / 10000);
+    realTime = usrTime + sysTime;
+  }
+#else
+  struct tms tms;
+  if (times(&tms) != -1) {
+    usrTime = (double)(tms.tms_utime) / sysconf(_SC_CLK_TCK);
+    sysTime = (double)(tms.tms_stime) / sysconf(_SC_CLK_TCK);
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tblah wrote:

Why did you decide to perform integer division on Windows, but (I think?) perform the division with floating point here?

https://github.com/llvm/llvm-project/pull/90578