From 6abdab8bf1ccda7f28916222043bb498a1b9adf3 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Mon, 28 Oct 2013 21:34:47 +0000 Subject: [PATCH] math: add some further fenv rounding mode tests --- src/math/fenv.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/src/math/fenv.c b/src/math/fenv.c index 9603504..91b6378 100644 --- a/src/math/fenv.c +++ b/src/math/fenv.c @@ -102,6 +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) @@ -121,6 +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); @@ -131,12 +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 */ -- 2.20.1