Add a test for origin tracking through large floating point arrays.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8008

memcheck/tests/Makefile.am

@@ -111,6 +111,8 @@ EXTRA_DIST = $(noinst_SCRIPTS) \
 	origin5-bz2.stderr.exp-glibc25-x86 \
 	origin5-bz2.stderr.exp-glibc25-amd64 \
 	origin5-bz2.stderr.exp-glibc27-ppc64 \
+	origin6-fp.vgtest origin6-fp.stdout.exp \
+	origin6-fp.stderr.exp \
 	oset_test.stderr.exp oset_test.stdout.exp oset_test.vgtest \
 	overlap.stderr.exp overlap.stdout.exp overlap.vgtest \
 	partiallydefinedeq.vgtest partiallydefinedeq.stderr.exp \
@@ -199,7 +201,8 @@ check_PROGRAMS = \
 	nanoleak nanoleak2 new_nothrow \
 	noisy_child \
 	null_socket oset_test \
-	origin1-yes origin2-not-quite origin3-no origin4-many origin5-bz2 \
+	origin1-yes origin2-not-quite origin3-no \
+	origin4-many origin5-bz2 origin6-fp \
 	overlap \
 	partiallydefinedeq \
 	partial_load pdb-realloc pdb-realloc2 \
@@ -257,6 +260,7 @@ varinfo6_CFLAGS		= $(AM_FLAG_M3264_PRI) $(AM_CFLAGS) -O -g
 origin4_many_CFLAGS	= $(AM_FLAG_M3264_PRI) $(AM_CFLAGS) -O -g
 # Apply -O so as to run in reasonable time
 origin5_bz2_CFLAGS	= $(AM_FLAG_M3264_PRI) $(AM_CFLAGS) -O -g
+origin6_fp_CFLAGS	= $(AM_FLAG_M3264_PRI) $(AM_CFLAGS) -O -g
 
 # C++ tests
 mismatches_SOURCES	= mismatches.cpp

memcheck/tests/origin6-fp.c

@@ -0,0 +1,104 @@
+
+/* Test of origin tracking through floating point code and in the case
+   where there are large amounts of uninitialised data floating
+   around.  This program creates 3 matrices of 2300x2300 doubles,
+   makes one value in them undefined, does arithmetic, and tests the
+   result, which is then undefined.
+
+   This also tests the secondary otag cache (ocacheL2), since the
+   amount of uninitialised data is somewhat over 43MB and it appears
+   that quite a lot of non-zero-otag lines are pushed into ocacheL2.
+
+   This program needs to be compiled with -O.
+*/
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "../memcheck.h"
+
+
+double** alloc_square_array ( int nArr )
+{
+  int i;
+  double** vec;
+  assert(nArr >= 1);
+  vec = malloc(nArr * sizeof(double*));
+  assert(vec);
+  for (i = 0; i < nArr; i++) {
+    vec[i] = malloc(nArr * sizeof(double));
+    assert(vec);
+  }
+  return vec;
+}
+
+double** do3x3smooth ( double** arr, int nArr )
+{
+  int i, j;
+  double** out;
+  assert(nArr >= 3);
+  out = alloc_square_array(nArr - 2);
+  assert(out);
+  for (i = 1; i < nArr-1; i++) {
+    for (j = 1; j < nArr-1; j++) {
+      double s =   arr[i-1][j-1] + arr[i-1][j  ] + arr[i-1][j+1]
+                 + arr[i  ][j-1] + arr[i  ][j  ] + arr[i  ][j+1]
+                 + arr[i+1][j-1] + arr[i+1][j  ] + arr[i+1][j+1];
+      out[i-1][j-1] = s / 9.0;
+    }
+  }
+  return out;
+}
+
+double sum ( double** arr, int nArr )
+{
+  int i, j;
+  double s = 0.0;
+  assert(nArr >= 1);
+  for (i = 0; i < nArr; i++) {
+    for (j = 0; j < nArr; j++) {
+      s += arr[i][j];
+    }
+  }
+  return s;
+}
+
+void setup_arr ( /*OUT*/double** arr, int nArr )
+{
+  int i, j;
+  assert(nArr >= 1);
+  for (i = 0; i < nArr; i++) {
+    for (j = 0; j < nArr; j++) {
+      arr[i][j] = (double)(i * j);
+      if (i == nArr/2 && j == nArr/2) {
+         unsigned char* p = (unsigned char*)&arr[i][j];
+         VALGRIND_MAKE_MEM_UNDEFINED(p, 1);
+      }
+    }
+  }
+}
+
+int main ( void )
+{
+  int nArr = 2300;
+  int ri;
+  double r, **arr, **arr2, **arr3;
+  arr = alloc_square_array(nArr);
+  setup_arr( arr, nArr );
+  arr2 = do3x3smooth( arr, nArr );
+  arr3 = do3x3smooth( arr2, nArr-2 );
+  r = sum( arr3, nArr-4 );
+  /* Convert answer to int before testing it, so as to
+     guarantee there's only one conditional branch. */
+  if (0) fprintf(stderr, "r = %g\n", r );
+  r /= 10000.0;
+  ri = (int)r;
+  if (0) fprintf(stderr, "ri = %d\n", ri);
+  if (ri == 696565111) {
+     fprintf(stderr, "Test succeeded.\n");
+  } else {
+     fprintf(stderr, "Test FAILED !\n");
+     assert(0);
+  }
+  return 0;
+}

memcheck/tests/origin6-fp.stderr.exp

@@ -0,0 +1,6 @@
+Conditional jump or move depends on uninitialised value(s)
+   at 0x........: main (origin6-fp.c:97)
+ Uninitialised value was created by a client request
+   at 0x........: setup_arr (origin6-fp.c:75)
+   by 0x........: main (origin6-fp.c:87)
+Test succeeded.

memcheck/tests/origin6-fp.vgtest

@@ -0,0 +1,2 @@
+prog: origin6-fp
+vgopts: -q --track-origins=yes