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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/testsuite/gcc.c-torture/execute/ieee/mul-subnormal-single-1.c | |
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Diffstat (limited to 'gcc/testsuite/gcc.c-torture/execute/ieee/mul-subnormal-single-1.c')
-rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/ieee/mul-subnormal-single-1.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/ieee/mul-subnormal-single-1.c b/gcc/testsuite/gcc.c-torture/execute/ieee/mul-subnormal-single-1.c new file mode 100644 index 000000000..d5f3fb45b --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/execute/ieee/mul-subnormal-single-1.c @@ -0,0 +1,75 @@ +/* Check that certain subnormal numbers (formerly known as denormalized + numbers) are rounded to within 0.5 ulp. PR other/14354. */ + +/* This test requires that float and unsigned int are the same size and + that the sign-bit of the float is at MSB of the unsigned int. */ + +#if __INT_MAX__ != 2147483647L +int main () { exit (0); } +#else + +union uf +{ + unsigned int u; + float f; +}; + +static float +u2f (unsigned int v) +{ + union uf u; + u.u = v; + return u.f; +} + +static unsigned int +f2u (float v) +{ + union uf u; + u.f = v; + return u.u; +} + +int ok = 1; + +static void +tstmul (unsigned int ux, unsigned int uy, unsigned int ur) +{ + float x = u2f (ux); + float y = u2f (uy); + + if (f2u (x * y) != ur) + /* Set a variable rather than aborting here, to simplify tracing when + several computations are wrong. */ + ok = 0; +} + +/* We don't want to make this const and static, or else we risk inlining + causing the test to fold as constants at compile-time. */ +struct +{ + unsigned int p1, p2, res; +} expected[] = + { + {0xfff, 0x3f800400, 0xfff}, + {0xf, 0x3fc88888, 0x17}, + {0xf, 0x3f844444, 0xf} + }; + +int +main (int argc, char *argv[], char *envp[]) +{ + unsigned int i; + + for (i = 0; i < sizeof (expected) / sizeof (expected[0]); i++) + { + tstmul (expected[i].p1, expected[i].p2, expected[i].res); + tstmul (expected[i].p2, expected[i].p1, expected[i].res); + } + + if (!ok) + abort (); + + exit (0); +} +#endif |