mirror of
https://sourceware.org/git/glibc.git
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328 lines
9.0 KiB
C
328 lines
9.0 KiB
C
#ifndef FENV_PRIVATE_H
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#define FENV_PRIVATE_H 1
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#include <fenv.h>
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#include <fpu_control.h>
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#ifdef __SSE2_MATH__
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# define math_opt_barrier(x) \
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({ __typeof(x) __x; \
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if (sizeof (x) <= sizeof (double)) \
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__asm ("" : "=x" (__x) : "0" (x)); \
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else \
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__asm ("" : "=t" (__x) : "0" (x)); \
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__x; })
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# define math_force_eval(x) \
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do { \
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if (sizeof (x) <= sizeof (double)) \
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__asm __volatile ("" : : "x" (x)); \
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else \
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__asm __volatile ("" : : "f" (x)); \
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} while (0)
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#else
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# define math_opt_barrier(x) \
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({ __typeof (x) __x; \
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__asm ("" : "=t" (__x) : "0" (x)); \
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__x; })
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# define math_force_eval(x) \
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do { \
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__typeof (x) __x = (x); \
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if (sizeof (x) <= sizeof (double)) \
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__asm __volatile ("" : : "m" (__x)); \
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else \
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__asm __volatile ("" : : "f" (__x)); \
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} while (0)
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#endif
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/* This file is used by both the 32- and 64-bit ports. The 64-bit port
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has a field in the fenv_t for the mxcsr; the 32-bit port does not.
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Instead, we (ab)use the only 32-bit field extant in the struct. */
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#ifndef __x86_64__
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# define __mxcsr __eip
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#endif
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/* All of these functions are private to libm, and are all used in pairs
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to save+change the fp state and restore the original state. Thus we
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need not care for both the 387 and the sse unit, only the one we're
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actually using. */
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#if defined __AVX__ || defined SSE2AVX
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# define STMXCSR "vstmxcsr"
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# define LDMXCSR "vldmxcsr"
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#else
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# define STMXCSR "stmxcsr"
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# define LDMXCSR "ldmxcsr"
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#endif
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static __always_inline void
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libc_feholdexcept_sse (fenv_t *e)
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{
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unsigned int mxcsr;
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asm (STMXCSR " %0" : "=m" (*&mxcsr));
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e->__mxcsr = mxcsr;
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mxcsr = (mxcsr | 0x1f80) & ~0x3f;
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asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
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}
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static __always_inline void
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libc_feholdexcept_387 (fenv_t *e)
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{
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/* Recall that fnstenv has a side-effect of masking exceptions.
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Clobber all of the fp registers so that the TOS field is 0. */
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asm volatile ("fnstenv %0; fnclex"
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: "=m"(*e)
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: : "st", "st(1)", "st(2)", "st(3)",
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"st(4)", "st(5)", "st(6)", "st(7)");
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}
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static __always_inline void
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libc_fesetround_sse (int r)
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{
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unsigned int mxcsr;
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asm (STMXCSR " %0" : "=m" (*&mxcsr));
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mxcsr = (mxcsr & ~0x6000) | (r << 3);
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asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
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}
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static __always_inline void
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libc_fesetround_387 (int r)
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{
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fpu_control_t cw;
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_FPU_GETCW (cw);
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cw = (cw & ~0xc00) | r;
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_FPU_SETCW (cw);
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}
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static __always_inline void
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libc_feholdexcept_setround_sse (fenv_t *e, int r)
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{
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unsigned int mxcsr;
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asm (STMXCSR " %0" : "=m" (*&mxcsr));
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e->__mxcsr = mxcsr;
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mxcsr = ((mxcsr | 0x1f80) & ~0x603f) | (r << 3);
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asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
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}
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/* Set both rounding mode and precision. A convenience function for use
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by libc_feholdexcept_setround and libc_feholdexcept_setround_53bit. */
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static __always_inline void
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libc_feholdexcept_setround_387_prec (fenv_t *e, int r)
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{
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libc_feholdexcept_387 (e);
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fpu_control_t cw = e->__control_word;
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cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
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cw |= r | 0x3f;
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_FPU_SETCW (cw);
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}
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static __always_inline void
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libc_feholdexcept_setround_387 (fenv_t *e, int r)
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{
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libc_feholdexcept_setround_387_prec (e, r | _FPU_EXTENDED);
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}
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static __always_inline void
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libc_feholdexcept_setround_387_53bit (fenv_t *e, int r)
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{
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libc_feholdexcept_setround_387_prec (e, r | _FPU_DOUBLE);
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}
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static __always_inline int
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libc_fetestexcept_sse (int e)
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{
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unsigned int mxcsr;
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asm volatile (STMXCSR " %0" : "=m" (*&mxcsr));
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return mxcsr & e & FE_ALL_EXCEPT;
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}
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static __always_inline int
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libc_fetestexcept_387 (int ex)
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{
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fexcept_t temp;
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asm volatile ("fnstsw %0" : "=a" (temp));
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return temp & ex & FE_ALL_EXCEPT;
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}
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static __always_inline void
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libc_fesetenv_sse (fenv_t *e)
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{
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asm volatile (LDMXCSR " %0" : : "m" (e->__mxcsr));
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}
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static __always_inline void
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libc_fesetenv_387 (fenv_t *e)
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{
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/* Clobber all fp registers so that the TOS value we saved earlier is
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compatible with the current state of the compiler. */
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asm volatile ("fldenv %0"
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: : "m" (*e)
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: "st", "st(1)", "st(2)", "st(3)",
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"st(4)", "st(5)", "st(6)", "st(7)");
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}
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static __always_inline int
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libc_feupdateenv_test_sse (fenv_t *e, int ex)
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{
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unsigned int mxcsr, old_mxcsr, cur_ex;
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asm volatile (STMXCSR " %0" : "=m" (*&mxcsr));
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cur_ex = mxcsr & FE_ALL_EXCEPT;
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/* Merge current exceptions with the old environment. */
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old_mxcsr = e->__mxcsr;
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mxcsr = old_mxcsr | cur_ex;
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asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
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/* Raise SIGFPE for any new exceptions since the hold. Expect that
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the normal environment has all exceptions masked. */
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if (__glibc_unlikely (~(old_mxcsr >> 7) & cur_ex))
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__feraiseexcept (cur_ex);
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/* Test for exceptions raised since the hold. */
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return cur_ex & ex;
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}
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static __always_inline int
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libc_feupdateenv_test_387 (fenv_t *e, int ex)
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{
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fexcept_t cur_ex;
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/* Save current exceptions. */
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asm volatile ("fnstsw %0" : "=a" (cur_ex));
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cur_ex &= FE_ALL_EXCEPT;
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/* Reload original environment. */
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libc_fesetenv_387 (e);
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/* Merge current exceptions. */
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__feraiseexcept (cur_ex);
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/* Test for exceptions raised since the hold. */
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return cur_ex & ex;
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}
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static __always_inline void
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libc_feupdateenv_sse (fenv_t *e)
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{
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libc_feupdateenv_test_sse (e, 0);
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}
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static __always_inline void
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libc_feupdateenv_387 (fenv_t *e)
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{
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libc_feupdateenv_test_387 (e, 0);
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}
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static __always_inline void
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libc_feholdsetround_sse (fenv_t *e, int r)
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{
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unsigned int mxcsr;
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asm (STMXCSR " %0" : "=m" (*&mxcsr));
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e->__mxcsr = mxcsr;
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mxcsr = (mxcsr & ~0x6000) | (r << 3);
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asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
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}
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static __always_inline void
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libc_feholdsetround_387_prec (fenv_t *e, int r)
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{
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fpu_control_t cw;
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_FPU_GETCW (cw);
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e->__control_word = cw;
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cw &= ~(_FPU_RC_ZERO | _FPU_EXTENDED);
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cw |= r;
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_FPU_SETCW (cw);
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}
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static __always_inline void
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libc_feholdsetround_387 (fenv_t *e, int r)
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{
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libc_feholdsetround_387_prec (e, r | _FPU_EXTENDED);
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}
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static __always_inline void
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libc_feholdsetround_387_53bit (fenv_t *e, int r)
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{
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libc_feholdsetround_387_prec (e, r | _FPU_DOUBLE);
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}
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static __always_inline void
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libc_feresetround_sse (fenv_t *e)
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{
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unsigned int mxcsr;
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asm (STMXCSR " %0" : "=m" (*&mxcsr));
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mxcsr = (mxcsr & ~0x6000) | (e->__mxcsr & 0x6000);
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asm volatile (LDMXCSR " %0" : : "m" (*&mxcsr));
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}
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static __always_inline void
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libc_feresetround_387 (fenv_t *e)
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{
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_FPU_SETCW (e->__control_word);
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}
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#ifdef __SSE_MATH__
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# define libc_feholdexceptf libc_feholdexcept_sse
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# define libc_fesetroundf libc_fesetround_sse
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# define libc_feholdexcept_setroundf libc_feholdexcept_setround_sse
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# define libc_fetestexceptf libc_fetestexcept_sse
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# define libc_fesetenvf libc_fesetenv_sse
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# define libc_feupdateenv_testf libc_feupdateenv_test_sse
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# define libc_feupdateenvf libc_feupdateenv_sse
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# define libc_feholdsetroundf libc_feholdsetround_sse
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# define libc_feresetroundf libc_feresetround_sse
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#else
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# define libc_feholdexceptf libc_feholdexcept_387
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# define libc_fesetroundf libc_fesetround_387
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# define libc_feholdexcept_setroundf libc_feholdexcept_setround_387
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# define libc_fetestexceptf libc_fetestexcept_387
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# define libc_fesetenvf libc_fesetenv_387
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# define libc_feupdateenv_testf libc_feupdateenv_test_387
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# define libc_feupdateenvf libc_feupdateenv_387
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# define libc_feholdsetroundf libc_feholdsetround_387
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# define libc_feresetroundf libc_feresetround_387
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#endif /* __SSE_MATH__ */
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#ifdef __SSE2_MATH__
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# define libc_feholdexcept libc_feholdexcept_sse
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# define libc_fesetround libc_fesetround_sse
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# define libc_feholdexcept_setround libc_feholdexcept_setround_sse
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# define libc_fetestexcept libc_fetestexcept_sse
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# define libc_fesetenv libc_fesetenv_sse
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# define libc_feupdateenv_test libc_feupdateenv_test_sse
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# define libc_feupdateenv libc_feupdateenv_sse
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# define libc_feholdsetround libc_feholdsetround_sse
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# define libc_feresetround libc_feresetround_sse
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#else
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# define libc_feholdexcept libc_feholdexcept_387
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# define libc_fesetround libc_fesetround_387
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# define libc_feholdexcept_setround libc_feholdexcept_setround_387
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# define libc_fetestexcept libc_fetestexcept_387
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# define libc_fesetenv libc_fesetenv_387
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# define libc_feupdateenv_test libc_feupdateenv_test_387
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# define libc_feupdateenv libc_feupdateenv_387
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# define libc_feholdsetround libc_feholdsetround_387
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# define libc_feresetround libc_feresetround_387
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#endif /* __SSE2_MATH__ */
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#define libc_feholdexceptl libc_feholdexcept_387
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#define libc_fesetroundl libc_fesetround_387
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#define libc_feholdexcept_setroundl libc_feholdexcept_setround_387
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#define libc_fetestexceptl libc_fetestexcept_387
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#define libc_fesetenvl libc_fesetenv_387
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#define libc_feupdateenv_testl libc_feupdateenv_test_387
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#define libc_feupdateenvl libc_feupdateenv_387
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#define libc_feholdsetroundl libc_feholdsetround_387
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#define libc_feresetroundl libc_feresetround_387
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#ifndef __SSE2_MATH__
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# define libc_feholdexcept_setround_53bit libc_feholdexcept_setround_387_53bit
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# define libc_feholdsetround_53bit libc_feholdsetround_387_53bit
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#endif
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#undef __mxcsr
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#endif /* FENV_PRIVATE_H */
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