add ere backref regression test

[libc-test] / src / math / fenv.c

diff --git a/src/math/fenv.c b/src/math/fenv.c
index e15f0bc..91b6378 100644 (file)
--- a/src/math/fenv.c
+++ b/src/math/fenv.c
@@ -37,6 +37,7 @@ static struct {
 #ifdef FE_UNDERFLOW
        F(FE_UNDERFLOW),
 #endif
+       {0, 0}
 };
 
 static void test_except()
@@ -45,7 +46,7 @@ static void test_except()
        int i,r;
        fenv_t env;
 
-       for (i=0; i < sizeof te/sizeof*te; i++) {
+       for (i=0; te[i].i; i++) {
                feclearexcept(FE_ALL_EXCEPT);
 
                r = feraiseexcept(te[i].i);
@@ -57,10 +58,15 @@ static void test_except()
                                te[i].name, te[i].i, r);
        }
 
+       r = feraiseexcept(FE_ALL_EXCEPT);
+       if (r != 0)
+               error("feraisexcept(FE_ALL_EXCEPT) failed\n");
        r = fegetenv(&env);
        if (r != 0)
                error("fegetenv(&env) = %d\n", r);
-       i = fetestexcept(FE_ALL_EXCEPT);
+       r = fetestexcept(FE_ALL_EXCEPT);
+       if (r != FE_ALL_EXCEPT)
+               error("fetestexcept failed: got 0x%x, want 0x%x (FE_ALL_ECXEPT)\n", r, FE_ALL_EXCEPT);
        r = fesetenv(FE_DFL_ENV);
        if (r != 0)
                error("fesetenv(FE_DFL_ENV) = %d\n", r);
@@ -71,7 +77,7 @@ static void test_except()
        if (r != 0)
                error("fesetenv(&env) = %d\n", r);
        r = fetestexcept(FE_ALL_EXCEPT);
-       if (r != i)
+       if (r != FE_ALL_EXCEPT)
                error("fesetenv(&env) did not restore exceptions: 0x%x\n", r);
 }
 
@@ -96,6 +102,8 @@ static void test_round()
        #pragma STDC FENV_ACCESS ON
        int i,r;
        fenv_t env;
+       volatile float two100 = 0x1p100;
+       volatile float x;
 
        for (i=0; i < sizeof tr/sizeof*tr; i++) {
                if (tr[i].i < 0)
@@ -115,6 +123,11 @@ static void test_round()
                        error("fegetround() = 0x%x, wanted 0x%x (%s)\n", r, tr[i].i, tr[i].name);
        }
 
+#ifdef FE_UPWARD
+       r = fesetround(FE_UPWARD);
+       if (r != 0)
+               error("fesetround(FE_UPWARD) failed\n");
+#endif
        r = fegetenv(&env);
        if (r != 0)
                error("fegetenv(&env) = %d\n", r);
@@ -125,12 +138,24 @@ static void test_round()
        r = fegetround();
        if (r != FE_TONEAREST)
                error("fesetenv(FE_DFL_ENV) did not set FE_TONEAREST (0x%x), got 0x%x\n", FE_TONEAREST, r);
+       x = two100 + 1;
+       if (x != two100)
+               error("fesetenv(FE_DFL_ENV) did not set FE_TONEAREST, arithmetics rounds upward\n");
+       x = two100 - 1;
+       if (x != two100)
+               error("fesetenv(FE_DFL_ENV) did not set FE_TONEAREST, arithmetics rounds downward or tozero\n");
        r = fesetenv(&env);
        if (r != 0)
                error("fesetenv(&env) = %d\n", r);
        r = fegetround();
        if (r != i)
                error("fesetenv(&env) did not restore 0x%x, got 0x%x\n", i, r);
+#ifdef FE_UPWARD
+       x = two100 + 1;
+       if (x == two100)
+               error("fesetenv did not restore upward rounding\n");
+#endif
+
 }
 
 /* ieee double precision add operation */
@@ -200,10 +225,42 @@ static void test_round_add(void)
        }
 }
 
+static void test_bad(void)
+{
+       fexcept_t f;
+       int r;
+
+       r = feclearexcept(FE_ALL_EXCEPT);
+       if (r != 0)
+               error("feclearexcept(FE_ALL_EXCEPT) failed\n");
+       r = fetestexcept(-1);
+       if (r != 0)
+               error("fetestexcept(-1) should return 0 when all exceptions are cleared, got %d\n", r);
+       r = feraiseexcept(1234567|FE_ALL_EXCEPT);
+       if (r != 0)
+               error("feraiseexcept returned non-zero for non-supported exceptions: %d\n", r);
+       r = feclearexcept(1234567|FE_ALL_EXCEPT);
+       if (r != 0)
+               error("feclearexcept returned non-zero for non-supported exceptions: %d\n", r);
+       r = fesetround(1234567);
+       if (r == 0)
+               error("fesetround should fail on invalid rounding mode\n");
+       r = fegetexceptflag(&f, 1234567);
+       if (r != 0)
+               error("fegetexceptflag returned non-zero for non-supported exceptions: %d\n", r);
+       r = fegetexceptflag(&f, 0);
+       if (r != 0)
+               error("fegetexceptflag(0) failed\n");
+       r = fesetexceptflag(&f, 1234567);
+       if (r != 0)
+               error("fesetexceptflag returned non-zero fir non-supported exceptions: %d\n", r);
+}
+
 int main(void)
 {
        test_except();
        test_round();
        test_round_add();
+       test_bad();
        return test_status;
 }