mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
f496b28e61
Previously, only the SSE2 rounding mode was set, so the assembler implementations using 387 were not following the expecting rounding mode.
496 lines
14 KiB
C
496 lines
14 KiB
C
#ifndef FENV_PRIVATE_H
|
|
#define FENV_PRIVATE_H 1
|
|
|
|
#include <bits/floatn.h>
|
|
#include <fenv.h>
|
|
#include <fpu_control.h>
|
|
|
|
/* This file is used by both the 32- and 64-bit ports. The 64-bit port
|
|
has a field in the fenv_t for the mxcsr; the 32-bit port does not.
|
|
Instead, we (ab)use the only 32-bit field extant in the struct. */
|
|
#ifndef __x86_64__
|
|
# define __mxcsr __eip
|
|
#endif
|
|
|
|
|
|
/* All of these functions are private to libm, and are all used in pairs
|
|
to save+change the fp state and restore the original state. Thus we
|
|
need not care for both the 387 and the sse unit, only the one we're
|
|
actually using. */
|
|
|
|
#if defined __AVX__ || defined SSE2AVX
|
|
# define STMXCSR "vstmxcsr"
|
|
# define LDMXCSR "vldmxcsr"
|
|
#else
|
|
# define STMXCSR "stmxcsr"
|
|
# define LDMXCSR "ldmxcsr"
|
|
#endif
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_sse (fenv_t *e)
|
|
{
|
|
unsigned int mxcsr;
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
e->__mxcsr = mxcsr;
|
|
mxcsr = (mxcsr | 0x1f80) & ~0x3f;
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_387 (fenv_t *e)
|
|
{
|
|
/* Recall that fnstenv has a side-effect of masking exceptions.
|
|
Clobber all of the fp registers so that the TOS field is 0. */
|
|
asm volatile ("fnstenv %0; fnclex"
|
|
: "=m"(*e)
|
|
: : "st", "st(1)", "st(2)", "st(3)",
|
|
"st(4)", "st(5)", "st(6)", "st(7)");
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_fesetround_sse (int r)
|
|
{
|
|
unsigned int mxcsr;
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
mxcsr = (mxcsr & ~0x6000) | (r << 3);
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_fesetround_387 (int r)
|
|
{
|
|
fpu_control_t cw;
|
|
_FPU_GETCW (cw);
|
|
cw = (cw & ~0xc00) | r;
|
|
_FPU_SETCW (cw);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_sse (fenv_t *e, int r)
|
|
{
|
|
unsigned int mxcsr;
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
e->__mxcsr = mxcsr;
|
|
mxcsr = ((mxcsr | 0x1f80) & ~0x603f) | (r << 3);
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
|
|
}
|
|
|
|
/* Set both rounding mode and precision. A convenience function for use
|
|
by libc_feholdexcept_setround and libc_feholdexcept_setround_53bit. */
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_387_prec (fenv_t *e, int r)
|
|
{
|
|
libc_feholdexcept_387 (e);
|
|
|
|
fpu_control_t cw = e->__control_word;
|
|
cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
|
|
cw |= r | 0x3f;
|
|
_FPU_SETCW (cw);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_387 (fenv_t *e, int r)
|
|
{
|
|
libc_feholdexcept_setround_387_prec (e, r | _FPU_EXTENDED);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_387_53bit (fenv_t *e, int r)
|
|
{
|
|
libc_feholdexcept_setround_387_prec (e, r | _FPU_DOUBLE);
|
|
}
|
|
|
|
static __always_inline int
|
|
libc_fetestexcept_sse (int e)
|
|
{
|
|
unsigned int mxcsr;
|
|
asm volatile (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
return mxcsr & e & FE_ALL_EXCEPT;
|
|
}
|
|
|
|
static __always_inline int
|
|
libc_fetestexcept_387 (int ex)
|
|
{
|
|
fexcept_t temp;
|
|
asm volatile ("fnstsw %0" : "=a" (temp));
|
|
return temp & ex & FE_ALL_EXCEPT;
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_fesetenv_sse (fenv_t *e)
|
|
{
|
|
asm volatile (LDMXCSR " %0" : : "m" (e->__mxcsr));
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_fesetenv_387 (fenv_t *e)
|
|
{
|
|
/* Clobber all fp registers so that the TOS value we saved earlier is
|
|
compatible with the current state of the compiler. */
|
|
asm volatile ("fldenv %0"
|
|
: : "m" (*e)
|
|
: "st", "st(1)", "st(2)", "st(3)",
|
|
"st(4)", "st(5)", "st(6)", "st(7)");
|
|
}
|
|
|
|
static __always_inline int
|
|
libc_feupdateenv_test_sse (fenv_t *e, int ex)
|
|
{
|
|
unsigned int mxcsr, old_mxcsr, cur_ex;
|
|
asm volatile (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
cur_ex = mxcsr & FE_ALL_EXCEPT;
|
|
|
|
/* Merge current exceptions with the old environment. */
|
|
old_mxcsr = e->__mxcsr;
|
|
mxcsr = old_mxcsr | cur_ex;
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
|
|
|
|
/* Raise SIGFPE for any new exceptions since the hold. Expect that
|
|
the normal environment has all exceptions masked. */
|
|
if (__glibc_unlikely (~(old_mxcsr >> 7) & cur_ex))
|
|
__feraiseexcept (cur_ex);
|
|
|
|
/* Test for exceptions raised since the hold. */
|
|
return cur_ex & ex;
|
|
}
|
|
|
|
static __always_inline int
|
|
libc_feupdateenv_test_387 (fenv_t *e, int ex)
|
|
{
|
|
fexcept_t cur_ex;
|
|
|
|
/* Save current exceptions. */
|
|
asm volatile ("fnstsw %0" : "=a" (cur_ex));
|
|
cur_ex &= FE_ALL_EXCEPT;
|
|
|
|
/* Reload original environment. */
|
|
libc_fesetenv_387 (e);
|
|
|
|
/* Merge current exceptions. */
|
|
__feraiseexcept (cur_ex);
|
|
|
|
/* Test for exceptions raised since the hold. */
|
|
return cur_ex & ex;
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feupdateenv_sse (fenv_t *e)
|
|
{
|
|
libc_feupdateenv_test_sse (e, 0);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feupdateenv_387 (fenv_t *e)
|
|
{
|
|
libc_feupdateenv_test_387 (e, 0);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_sse (fenv_t *e, int r)
|
|
{
|
|
unsigned int mxcsr;
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
e->__mxcsr = mxcsr;
|
|
mxcsr = (mxcsr & ~0x6000) | (r << 3);
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_387_prec (fenv_t *e, int r)
|
|
{
|
|
fpu_control_t cw;
|
|
|
|
_FPU_GETCW (cw);
|
|
e->__control_word = cw;
|
|
cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
|
|
cw |= r;
|
|
_FPU_SETCW (cw);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_387 (fenv_t *e, int r)
|
|
{
|
|
libc_feholdsetround_387_prec (e, r | _FPU_EXTENDED);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_387_53bit (fenv_t *e, int r)
|
|
{
|
|
libc_feholdsetround_387_prec (e, r | _FPU_DOUBLE);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feresetround_sse (fenv_t *e)
|
|
{
|
|
unsigned int mxcsr;
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
mxcsr = (mxcsr & ~0x6000) | (e->__mxcsr & 0x6000);
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feresetround_387 (fenv_t *e)
|
|
{
|
|
_FPU_SETCW (e->__control_word);
|
|
}
|
|
|
|
#ifdef __SSE_MATH__
|
|
# define libc_feholdexceptf libc_feholdexcept_sse
|
|
# define libc_fesetroundf libc_fesetround_sse
|
|
# define libc_feholdexcept_setroundf libc_feholdexcept_setround_sse
|
|
# define libc_fetestexceptf libc_fetestexcept_sse
|
|
# define libc_fesetenvf libc_fesetenv_sse
|
|
# define libc_feupdateenv_testf libc_feupdateenv_test_sse
|
|
# define libc_feupdateenvf libc_feupdateenv_sse
|
|
# define libc_feholdsetroundf libc_feholdsetround_sse
|
|
# define libc_feresetroundf libc_feresetround_sse
|
|
#else
|
|
# define libc_feholdexceptf libc_feholdexcept_387
|
|
# define libc_fesetroundf libc_fesetround_387
|
|
# define libc_feholdexcept_setroundf libc_feholdexcept_setround_387
|
|
# define libc_fetestexceptf libc_fetestexcept_387
|
|
# define libc_fesetenvf libc_fesetenv_387
|
|
# define libc_feupdateenv_testf libc_feupdateenv_test_387
|
|
# define libc_feupdateenvf libc_feupdateenv_387
|
|
# define libc_feholdsetroundf libc_feholdsetround_387
|
|
# define libc_feresetroundf libc_feresetround_387
|
|
#endif /* __SSE_MATH__ */
|
|
|
|
#ifdef __SSE2_MATH__
|
|
# define libc_feholdexcept libc_feholdexcept_sse
|
|
# define libc_fesetround libc_fesetround_sse
|
|
# define libc_feholdexcept_setround libc_feholdexcept_setround_sse
|
|
# define libc_fetestexcept libc_fetestexcept_sse
|
|
# define libc_fesetenv libc_fesetenv_sse
|
|
# define libc_feupdateenv_test libc_feupdateenv_test_sse
|
|
# define libc_feupdateenv libc_feupdateenv_sse
|
|
# define libc_feholdsetround libc_feholdsetround_sse
|
|
# define libc_feresetround libc_feresetround_sse
|
|
#else
|
|
# define libc_feholdexcept libc_feholdexcept_387
|
|
# define libc_fesetround libc_fesetround_387
|
|
# define libc_feholdexcept_setround libc_feholdexcept_setround_387
|
|
# define libc_fetestexcept libc_fetestexcept_387
|
|
# define libc_fesetenv libc_fesetenv_387
|
|
# define libc_feupdateenv_test libc_feupdateenv_test_387
|
|
# define libc_feupdateenv libc_feupdateenv_387
|
|
# define libc_feholdsetround libc_feholdsetround_387
|
|
# define libc_feresetround libc_feresetround_387
|
|
#endif /* __SSE2_MATH__ */
|
|
|
|
#define libc_feholdexceptl libc_feholdexcept_387
|
|
#define libc_fesetroundl libc_fesetround_387
|
|
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_387
|
|
#define libc_fetestexceptl libc_fetestexcept_387
|
|
#define libc_fesetenvl libc_fesetenv_387
|
|
#define libc_feupdateenv_testl libc_feupdateenv_test_387
|
|
#define libc_feupdateenvl libc_feupdateenv_387
|
|
#define libc_feholdsetroundl libc_feholdsetround_387
|
|
#define libc_feresetroundl libc_feresetround_387
|
|
|
|
#ifndef __SSE2_MATH__
|
|
# define libc_feholdexcept_setround_53bit libc_feholdexcept_setround_387_53bit
|
|
# define libc_feholdsetround_53bit libc_feholdsetround_387_53bit
|
|
#endif
|
|
|
|
#ifdef __x86_64__
|
|
/* The SSE rounding mode is used by soft-fp (libgcc and glibc) on
|
|
x86_64, so that must be set for float128 computations. */
|
|
# define SET_RESTORE_ROUNDF128(RM) \
|
|
SET_RESTORE_ROUND_GENERIC (RM, libc_feholdsetround_sse, libc_feresetround_sse)
|
|
# define libc_feholdexcept_setroundf128 libc_feholdexcept_setround_sse
|
|
# define libc_feupdateenv_testf128 libc_feupdateenv_test_sse
|
|
#else
|
|
/* The 387 rounding mode is used by soft-fp for 32-bit, but whether
|
|
387 or SSE exceptions are used depends on whether libgcc was built
|
|
for SSE math, which is not known when glibc is being built. */
|
|
# define libc_feholdexcept_setroundf128 default_libc_feholdexcept_setround
|
|
# define libc_feupdateenv_testf128 default_libc_feupdateenv_test
|
|
#endif
|
|
|
|
/* We have support for rounding mode context. */
|
|
#define HAVE_RM_CTX 1
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_sse_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
unsigned int mxcsr, new_mxcsr;
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
new_mxcsr = ((mxcsr | 0x1f80) & ~0x603f) | (r << 3);
|
|
|
|
ctx->env.__mxcsr = mxcsr;
|
|
if (__glibc_unlikely (mxcsr != new_mxcsr))
|
|
{
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&new_mxcsr));
|
|
ctx->updated_status = true;
|
|
}
|
|
else
|
|
ctx->updated_status = false;
|
|
}
|
|
|
|
/* Unconditional since we want to overwrite any exceptions that occurred in the
|
|
context. This is also why all fehold* functions unconditionally write into
|
|
ctx->env. */
|
|
static __always_inline void
|
|
libc_fesetenv_sse_ctx (struct rm_ctx *ctx)
|
|
{
|
|
libc_fesetenv_sse (&ctx->env);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feupdateenv_sse_ctx (struct rm_ctx *ctx)
|
|
{
|
|
if (__glibc_unlikely (ctx->updated_status))
|
|
libc_feupdateenv_test_sse (&ctx->env, 0);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_387_prec_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
libc_feholdexcept_387 (&ctx->env);
|
|
|
|
fpu_control_t cw = ctx->env.__control_word;
|
|
fpu_control_t old_cw = cw;
|
|
cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
|
|
cw |= r | 0x3f;
|
|
|
|
if (__glibc_unlikely (old_cw != cw))
|
|
{
|
|
_FPU_SETCW (cw);
|
|
ctx->updated_status = true;
|
|
}
|
|
else
|
|
ctx->updated_status = false;
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_387_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
libc_feholdexcept_setround_387_prec_ctx (ctx, r | _FPU_EXTENDED);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdexcept_setround_387_53bit_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
libc_feholdexcept_setround_387_prec_ctx (ctx, r | _FPU_DOUBLE);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_387_prec_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
fpu_control_t cw, new_cw;
|
|
|
|
_FPU_GETCW (cw);
|
|
new_cw = cw;
|
|
new_cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
|
|
new_cw |= r;
|
|
|
|
ctx->env.__control_word = cw;
|
|
if (__glibc_unlikely (new_cw != cw))
|
|
{
|
|
_FPU_SETCW (new_cw);
|
|
ctx->updated_status = true;
|
|
}
|
|
else
|
|
ctx->updated_status = false;
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_387_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
libc_feholdsetround_387_prec_ctx (ctx, r | _FPU_EXTENDED);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_387_53bit_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
libc_feholdsetround_387_prec_ctx (ctx, r | _FPU_DOUBLE);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feholdsetround_sse_ctx (struct rm_ctx *ctx, int r)
|
|
{
|
|
unsigned int mxcsr, new_mxcsr;
|
|
|
|
asm (STMXCSR " %0" : "=m" (*&mxcsr));
|
|
new_mxcsr = (mxcsr & ~0x6000) | (r << 3);
|
|
|
|
ctx->env.__mxcsr = mxcsr;
|
|
if (__glibc_unlikely (new_mxcsr != mxcsr))
|
|
{
|
|
asm volatile (LDMXCSR " %0" : : "m" (*&new_mxcsr));
|
|
ctx->updated_status = true;
|
|
}
|
|
else
|
|
ctx->updated_status = false;
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feresetround_sse_ctx (struct rm_ctx *ctx)
|
|
{
|
|
if (__glibc_unlikely (ctx->updated_status))
|
|
libc_feresetround_sse (&ctx->env);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feresetround_387_ctx (struct rm_ctx *ctx)
|
|
{
|
|
if (__glibc_unlikely (ctx->updated_status))
|
|
_FPU_SETCW (ctx->env.__control_word);
|
|
}
|
|
|
|
static __always_inline void
|
|
libc_feupdateenv_387_ctx (struct rm_ctx *ctx)
|
|
{
|
|
if (__glibc_unlikely (ctx->updated_status))
|
|
libc_feupdateenv_test_387 (&ctx->env, 0);
|
|
}
|
|
|
|
#ifdef __SSE_MATH__
|
|
# define libc_feholdexcept_setroundf_ctx libc_feholdexcept_setround_sse_ctx
|
|
# define libc_fesetenvf_ctx libc_fesetenv_sse_ctx
|
|
# define libc_feupdateenvf_ctx libc_feupdateenv_sse_ctx
|
|
# define libc_feholdsetroundf_ctx libc_feholdsetround_sse_ctx
|
|
# define libc_feresetroundf_ctx libc_feresetround_sse_ctx
|
|
#else
|
|
# define libc_feholdexcept_setroundf_ctx libc_feholdexcept_setround_387_ctx
|
|
# define libc_feupdateenvf_ctx libc_feupdateenv_387_ctx
|
|
# define libc_feholdsetroundf_ctx libc_feholdsetround_387_ctx
|
|
# define libc_feresetroundf_ctx libc_feresetround_387_ctx
|
|
#endif /* __SSE_MATH__ */
|
|
|
|
#ifdef __SSE2_MATH__
|
|
# if defined (__x86_64__) || !defined (MATH_SET_BOTH_ROUNDING_MODES)
|
|
# define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_sse_ctx
|
|
# define libc_fesetenv_ctx libc_fesetenv_sse_ctx
|
|
# define libc_feupdateenv_ctx libc_feupdateenv_sse_ctx
|
|
# define libc_feholdsetround_ctx libc_feholdsetround_sse_ctx
|
|
# define libc_feresetround_ctx libc_feresetround_sse_ctx
|
|
# else
|
|
# define libc_feholdexcept_setround_ctx default_libc_feholdexcept_setround_ctx
|
|
# define libc_fesetenv_ctx default_libc_fesetenv_ctx
|
|
# define libc_feupdateenv_ctx default_libc_feupdateenv_ctx
|
|
# define libc_feholdsetround_ctx default_libc_feholdsetround_ctx
|
|
# define libc_feresetround_ctx default_libc_feresetround_ctx
|
|
# endif
|
|
#else
|
|
# define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_387_ctx
|
|
# define libc_feupdateenv_ctx libc_feupdateenv_387_ctx
|
|
# define libc_feholdsetround_ctx libc_feholdsetround_387_ctx
|
|
# define libc_feresetround_ctx libc_feresetround_387_ctx
|
|
#endif /* __SSE2_MATH__ */
|
|
|
|
#define libc_feholdexcept_setroundl_ctx libc_feholdexcept_setround_387_ctx
|
|
#define libc_feupdateenvl_ctx libc_feupdateenv_387_ctx
|
|
#define libc_feholdsetroundl_ctx libc_feholdsetround_387_ctx
|
|
#define libc_feresetroundl_ctx libc_feresetround_387_ctx
|
|
|
|
#ifndef __SSE2_MATH__
|
|
# define libc_feholdsetround_53bit_ctx libc_feholdsetround_387_53bit_ctx
|
|
# define libc_feresetround_53bit_ctx libc_feresetround_387_ctx
|
|
#endif
|
|
|
|
#undef __mxcsr
|
|
|
|
#endif /* FENV_PRIVATE_H */
|