From 4855e3ddf5061dd8ddcefafc7185f6f70937434b Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 18 Oct 2011 09:59:04 -0400 Subject: [PATCH] Provide combined internal feholdexcept/fesetround interface --- ChangeLog | 6 ++++++ math/math_private.h | 7 +++++++ sysdeps/ieee754/dbl-64/e_exp2.c | 6 +----- sysdeps/x86_64/fpu/math_private.h | 14 +++++++++++++- 4 files changed, 27 insertions(+), 6 deletions(-) diff --git a/ChangeLog b/ChangeLog index 3802f85..de8b2c3 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,11 @@ 2011-10-18 Ulrich Drepper + * math/math_private.h: Define defaults for libc_feholdexcept_setround, + libc_feholdexcept_setroundf, libc_feholdexcept_setroundl. + * sysdeps/ieee754/dbl-64/e_exp2.c: Use libc_feholdexcept_setround. + * sysdeps/x86_64/fpu/math_private.h: Define special version of + libc_feholdexcept_setround. + * sysdeps/x86_64/fpu/multiarch/Makefile [math] (libm-sysdep-routines): Add s_nearbyint-c and s_nearbyintf-c. * sysdeps/x86_64/fpu/bits/mathinline.h: Define nearbyint and diff --git a/math/math_private.h b/math/math_private.h index a1ce014..38ff09e 100644 --- a/math/math_private.h +++ b/math/math_private.h @@ -376,6 +376,13 @@ extern void __docos (double __x, double __dx, double __v[]); #define libc_feholdexceptf(e) (void) feholdexcept (e) #define libc_feholdexceptl(e) (void) feholdexcept (e) +#define libc_feholdexcept_setround(e, r) \ + do { feholdexcept (e); fesetround (r); } while (0) +#define libc_feholdexcept_setroundf(e, r) \ + do { feholdexcept (e); fesetround (r); } while (0) +#define libc_feholdexcept_setroundl(e, r) \ + do { feholdexcept (e); fesetround (r); } while (0) + #define libc_fesetenv(e) (void) fesetenv (e) #define libc_fesetenvf(e) (void) fesetenv (e) #define libc_fesetenvl(e) (void) fesetenv (e) diff --git a/sysdeps/ieee754/dbl-64/e_exp2.c b/sysdeps/ieee754/dbl-64/e_exp2.c index 734e476..0b7330a 100644 --- a/sysdeps/ieee754/dbl-64/e_exp2.c +++ b/sysdeps/ieee754/dbl-64/e_exp2.c @@ -64,11 +64,7 @@ __ieee754_exp2 (double x) union ieee754_double ex2_u, scale_u; fenv_t oldenv; - libc_feholdexcept (&oldenv); -#ifdef FE_TONEAREST - /* If we don't have this, it's too bad. */ - libc_fesetround (FE_TONEAREST); -#endif + libc_feholdexcept_setround (&oldenv, FE_TONEAREST); /* 1. Argument reduction. Choose integers ex, -256 <= t < 256, and some real diff --git a/sysdeps/x86_64/fpu/math_private.h b/sysdeps/x86_64/fpu/math_private.h index 4886c64..28bd9ce 100644 --- a/sysdeps/x86_64/fpu/math_private.h +++ b/sysdeps/x86_64/fpu/math_private.h @@ -145,7 +145,7 @@ do { \ #undef libc_feholdexcept #define libc_feholdexcept(e) \ - do { \ + do { \ unsigned int mxcsr; \ asm ("stmxcsr %0" : "=m" (*&mxcsr)); \ (e)->__mxcsr = mxcsr; \ @@ -155,6 +155,18 @@ do { \ // #define libc_feholdexceptf(e) (void) feholdexcept (e) // #define libc_feholdexceptl(e) (void) feholdexcept (e) +#undef libc_feholdexcept_setround +#define libc_feholdexcept_setround(e, r) \ + do { \ + unsigned int mxcsr; \ + asm ("stmxcsr %0" : "=m" (*&mxcsr)); \ + (e)->__mxcsr = mxcsr; \ + mxcsr = ((mxcsr | 0x1f80) & ~0x603f) | ((r) << 3); \ + asm volatile ("ldmxcsr %0" : : "m" (*&mxcsr)); \ + } while (0) +// #define libc_feholdexcept_setroundf(e, r) ... +// #define libc_feholdexcept_setroundl(e, r) ... + #undef libc_fesetenv #define libc_fesetenv(e) \ asm volatile ("ldmxcsr %0" : : "m" ((e)->__mxcsr)) -- 2.7.4