aboutsummaryrefslogtreecommitdiffstats
path: root/utils/fpcmp
diff options
context:
space:
mode:
authorChris Lattner <sabre@nondot.org>2004-04-13 20:55:49 +0000
committerChris Lattner <sabre@nondot.org>2004-04-13 20:55:49 +0000
commit337481a07eccde47e8cfcb539c6c350307e5f036 (patch)
treeb85fb9369b90801ff921723282cfc79fef9057c1 /utils/fpcmp
parentd828bc6b315442f09c828209c73a659a1b8ad326 (diff)
downloadexternal_llvm-337481a07eccde47e8cfcb539c6c350307e5f036.zip
external_llvm-337481a07eccde47e8cfcb539c6c350307e5f036.tar.gz
external_llvm-337481a07eccde47e8cfcb539c6c350307e5f036.tar.bz2
Okay, spiff is completely incapable of handling files of nontrivial size.
Here is a simple minimal program that does what we want. Instead of taking minutes to compare mesa's output, and crashing on binary files (like spiff does), this take < .02s in the common case and doesn't crash. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12926 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'utils/fpcmp')
-rw-r--r--utils/fpcmp/Makefile15
-rw-r--r--utils/fpcmp/fpcmp.cpp156
2 files changed, 171 insertions, 0 deletions
diff --git a/utils/fpcmp/Makefile b/utils/fpcmp/Makefile
new file mode 100644
index 0000000..e38c51d
--- /dev/null
+++ b/utils/fpcmp/Makefile
@@ -0,0 +1,15 @@
+##===- utils/fpcmp/Makefile --------------------------------*- Makefile -*-===##
+#
+# 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.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+TOOLNAME = fpcmp
+USEDLIBS = support.a
+
+include $(LEVEL)/Makefile.common
+
diff --git a/utils/fpcmp/fpcmp.cpp b/utils/fpcmp/fpcmp.cpp
new file mode 100644
index 0000000..ae5667a
--- /dev/null
+++ b/utils/fpcmp/fpcmp.cpp
@@ -0,0 +1,156 @@
+//===- 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.
+//
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Support/CommandLine.h"
+#include "Support/FileUtilities.h"
+#include "Config/fcntl.h"
+#include "Config/sys/mman.h"
+#include <iostream>
+#include <cmath>
+
+using namespace llvm;
+
+namespace {
+ cl::opt<std::string>
+ File1(cl::Positional, cl::desc("<input file #1>"), cl::Required);
+ cl::opt<std::string>
+ File2(cl::Positional, cl::desc("<input file #2>"), cl::Required);
+
+ cl::opt<double>
+ RelTolerance("r", cl::desc("Relative error tolerated"), cl::init(0));
+ cl::opt<double>
+ 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){
+ int FD = open(Filename.c_str(), O_RDONLY);
+ if (FD == -1 || (Len = getFileSize(Filename)) == ~0U) {
+ std::cerr << "Error: cannot open file '" << Filename << "'\n";
+ exit(2);
+ }
+
+ // mmap in the file all at once...
+ BufPtr = (char*)mmap(0, Len, PROT_READ, MAP_PRIVATE, FD, 0);
+
+ if (BufPtr == (char*)MAP_FAILED) {
+ 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 '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 tolerence: 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;
+}
+