Merging r261365:

[oota-llvm.git] / utils / fpcmp / fpcmp.cpp

diff --git a/utils/fpcmp/fpcmp.cpp b/utils/fpcmp/fpcmp.cpp
index e7e318efd3ddd5b7aaf43a70338e525f5f1b65b1..bbe7276e13a0d428895e7d381758c864afdc81d6 100644 (file)
--- a/utils/fpcmp/fpcmp.cpp
+++ b/utils/fpcmp/fpcmp.cpp
@@ -1,24 +1,20 @@
 //===- fpcmp.cpp - A fuzzy "cmp" that permits floating point noise --------===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
 // fpcmp is a tool that basically works like the 'cmp' tool, except that it can
-// tolerate errors due to floating point noise, with the -r option.
+// tolerate errors due to floating point noise, with the -r and -a options.
 //
 //===----------------------------------------------------------------------===//
 
-#include "Support/CommandLine.h"
-#include "Support/FileUtilities.h"
-#include "Config/fcntl.h"
-#include "Config/sys/mman.h"
-#include <iostream>
-#include <cmath>
-
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
 namespace {
@@ -33,116 +29,14 @@ namespace {
   AbsTolerance("a", cl::desc("Absolute error tolerated"), cl::init(0));
 }
 
-
-/// OpenFile - mmap the specified file into the address space for reading, and
-/// return the length and address of the buffer.
-static void OpenFile(const std::string &Filename, unsigned &Len, char* &BufPtr){
-  BufPtr = (char*)ReadFileIntoAddressSpace(Filename, Len);
-  if (BufPtr == 0) {
-    std::cerr << "Error: cannot open file '" << Filename << "'\n";
-    exit(2);
-  }
-}
-
-static bool isNumberChar(char C) {
-  switch (C) {
-  case '0': case '1': case '2': case '3': case '4':
-  case '5': case '6': case '7': case '8': case '9': 
-  case '.': case '+': case '-':
-  case 'e':
-  case 'E': return true;
-  default: return false;
-  }
-}
-
-static char *BackupNumber(char *Pos, char *FirstChar) {
-  while (Pos > FirstChar && isNumberChar(Pos[-1]))
-    --Pos;
-  return Pos;
-}
-
-static void CompareNumbers(char *&F1P, char *&F2P, char *F1End, char *F2End) {
-  char *F1NumEnd, *F2NumEnd;
-  double V1 = strtod(F1P, &F1NumEnd);
-  double V2 = strtod(F2P, &F2NumEnd);
-
-  if (F1NumEnd == F1P || F2NumEnd == F2P) {
-    std::cerr << "Comparison failed, not a numeric difference.\n";
-    exit(1);
-  }
-
-  // Check to see if these are inside the absolute tolerance
-  if (AbsTolerance < std::abs(V1-V2)) {
-    // Nope, check the relative tolerance...
-    double Diff;
-    if (V2)
-      Diff = std::abs(V1/V2 - 1.0);
-    else if (V1)
-      Diff = std::abs(V2/V1 - 1.0);
-    else
-      Diff = 0;  // Both zero.
-    if (Diff > RelTolerance) {
-      std::cerr << "Compared: " << V1 << " and " << V2 << ": diff = "
-                << Diff << "\n";
-      std::cerr << "Out of tolerance: rel/abs: " << RelTolerance
-                << "/" << AbsTolerance << "\n";
-      exit(1);
-    }
-  }
-
-  // Otherwise, advance our read pointers to the end of the numbers.
-  F1P = F1NumEnd;  F2P = F2NumEnd;
-}
-
-
 int main(int argc, char **argv) {
   cl::ParseCommandLineOptions(argc, argv);
 
-  // mmap in the files.
-  unsigned File1Len, File2Len;
-  char *File1Start, *File2Start;
-  OpenFile(File1, File1Len, File1Start);
-  OpenFile(File2, File2Len, File2Start);
-
-  // Okay, now that we opened the files, scan them for the first difference.
-  char *File1End = File1Start+File1Len;
-  char *File2End = File2Start+File2Len;
-  char *F1P = File1Start;
-  char *F2P = File2Start;
-  
-  while (1) {
-    // Scan for the end of file or first difference.
-    while (F1P < File1End && F2P < File2End && *F1P == *F2P)
-      ++F1P, ++F2P;
-
-    if (F1P >= File1End || F2P >= File2End) break;
-
-    // Okay, we must have found a difference.  Backup to the start of the
-    // current number each stream is at so that we can compare from the
-    // beginning.
-    F1P = BackupNumber(F1P, File1Start);
-    F2P = BackupNumber(F2P, File2Start);
-
-    // Now that we are at the start of the numbers, compare them, exiting if
-    // they don't match.
-    CompareNumbers(F1P, F2P, File1End, File2End);
-  }
-
-  // Okay, we reached the end of file.  If both files are at the end, we
-  // succeeded.
-  if (F1P >= File1End && F2P >= File2End) return 0;
-
-  // Otherwise, we might have run off the end due to a number, backup and retry.
-  F1P = BackupNumber(F1P, File1Start);
-  F2P = BackupNumber(F2P, File2Start);
-
-  // Now that we are at the start of the numbers, compare them, exiting if
-  // they don't match.
-  CompareNumbers(F1P, F2P, File1End, File2End);
-
-  // If we found the end, we succeeded.
-  if (F1P >= File1End && F2P >= File2End) return 0;
-
-  return 1;
+  std::string ErrorMsg;
+  int DF = DiffFilesWithTolerance(File1, File2, AbsTolerance, RelTolerance,
+                                  &ErrorMsg);
+  if (!ErrorMsg.empty())
+    errs() << argv[0] << ": " << ErrorMsg << "\n";
+  return DF;
 }